JPH06325274A - Radiation type fire sensor - Google Patents

Abstract

PURPOSE:To clearly discriminate between malfunction due to the contamination and the damage of a translucent cover and the fault of a light receiving circuit including a light receiving element so that the compensation of the contamination and the damage of the translucent cover and the compensation of the light receiving sensitivity of the light receiving element can be executed automatically. CONSTITUTION:External LEDs 4L, 4R to emit a first pseudo flame signal, internal LEDs 3Lb, 3Lr, 3Rb, 3Rr to emit a second pseudo flame signal, a sensor control circuit 20 including a first operation testing means to test fire sensing operation by making the light receiving elements 1L, 1R receive the first pseudo flame signal respectively, a second operation testing means to test the fire sensing operation by making the light receiving elements 1L, 2L, 1R, 2R receive the second pseudo flame signal respectively, and a means to compensate automatically the contamination and the damage by computing the light reducing rate of the translucent cover and compensate automatically the deterioration of allowable light receiving sensitivity by computing the light receiving sensitivity the light receiving element at the time of the test, and a transmission control circuit 21 and a signal transmitting receiving part 22 to inform of the outside that automatic compensation reaches or exceeds its limit are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiant fire detector for detecting a radiant light emitted from a flame to detect a fire, and more particularly to a radiant fire detector having a self-test function by a pseudo flame signal.

[0002]

2. Description of the Related Art Conventionally, as a radiation type fire detector, a constant radiation type that detects when the radiant energy of a specific wavelength band emitted from a flame has reached a certain amount or more, a flicker that detects a flicker peculiar to a flame There are various formulas, such as a two-wavelength formula and a three-wavelength formula, which compare the magnitudes of radiant energy in a plurality of wavelength bands. In many of these radiant fire detectors, radiant light such as ultraviolet rays and infrared rays emitted from the flame is detected by a light receiving element (eg, photodiode, pyroelectric element, discharge tube, etc.).

A transparent cover made of dust-proof transparent glass, an optical filter, or the like is provided on the front surface of the light receiving element, and radiant light from the flame passes through the transparent cover to reach the light receiving element. A structure that allows light to be received, but blocks the passage of foreign matter, moisture, gas, etc. from the outside (eg, airtight structure)
In many cases, the light receiving element and the internal fire detection circuit are protected.

[0004]

However, even if the radiation type fire detector is provided with the light-transmitting cover having the airtight structure to protect the light receiving elements such as the pyroelectric element and the photodiode, the light receiving of these elements is prevented. It is difficult to maintain various characteristics such as sensitivity in the same state as the initial state for a long period of time, and the sensitivity deteriorates with the lapse of time, sometimes flame detection cannot be performed. Also, when time passes after the fire detector is installed, the translucent cover is contaminated by dust and the like contained in the outside air, and the light transmittance is gradually reduced, and as a result, the amount of light received by the light receiving element is reduced. The flame may not be detected due to the decrease of

Therefore, in some high-performance fire detectors, a pseudo flame light source provided outside the translucent cover is turned on to determine whether or not the fire detector normally performs the fire detection operation. Some have tests. However, when fire detection cannot be performed in the operation test, malfunction occurs due to contamination of the translucent cover, and if the dirt is cleaned, the fire detection operation returns to normal, or the light receiving circuit including the light receiving element fails, There was a problem that it was not possible to determine whether the maker required repair. If the light-receiving sensitivity of the light-receiving element decreases during use, maintenance personnel should increase the amplification of the amplifier that amplifies the output of the light-receiving element or detect a fire so that fire failure will not be reported. There is a problem that it is necessary to perform a process of reducing the threshold value, and if a large number of fire detectors are installed, it takes a lot of time for maintenance work.

The present invention has been made in order to solve the above problems, and is a radiant type which senses a fire by receiving radiant transmitted light from a flame by a light receiving element provided inside a translucent cover. When the fire detector is malfunctioning, the malfunction of the light-transmitting cover due to the contamination of the light-transmitting cover and the malfunction of the light-receiving circuit including the light-receiving element are clearly discriminated. Radiation fire detection that calculates the light receiving sensitivity of the light receiving element and can automatically perform stain compensation of the translucent cover and light receiving sensitivity of the light receiving element according to the calculated values of extinction ratio and light receiving sensitivity. The purpose is to obtain a vessel.

[0007]

A radiant fire detector according to the present invention is provided with a translucent cover for transmitting radiant light emitted from a flame and an inner side of the translucent cover. A light receiving element for receiving the transmitted light from the transparent cover,
A radiant fire detector having a means for detecting a fire based on a detection signal of the light receiving element, the first fire testing device being provided outside the translucent cover and driven by a first operation test means.
Of the first test light-emitting element that emits the pseudo-flame signal of No. 1 and transmits the light-transmitting cover to irradiate the light-receiving element, and a first pseudo-flame signal by driving the first test light-emitting element. A first operation test unit that emits light to illuminate the light receiving element, and a detection signal level of the light receiving element is measured during a test of the first operation test unit, and the translucency is based on the measured value. Extinction rate calculating means for calculating the extinction rate of the cover, and a stain degree determining means for determining whether or not the calculated value of the extinction rate is equal to or more than the lower limit value of the preset extinction rate allowable range, When the determination result of the contamination degree determining means is affirmative, the amplification factor of the amplifier for amplifying the output of the light receiving element is changed or the threshold value for detecting a fire is determined according to the calculated value of the extinction ratio. And a stain compensating hand for compensating for stains on the translucent cover. Is obtained and an automatic compensation means fouling including and.

According to a second aspect of the present invention, there is provided a radiant fire detector, wherein a transparent cover for transmitting radiant light emitted from a flame and a transparent cover provided inside the transparent cover are provided. In a radiant fire detector having a light receiving element that receives transmitted light, and means for detecting a fire based on a detection signal of the light receiving element, the radiant fire detector is provided inside the translucent cover,
A second pseudo flame signal is emitted by driving the second operation test means, and the light receiving element is directly or indirectly irradiated with the second light.
And a second operation test means for driving the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element, and the second operation test means. During the test of, measure the detection signal level of the light receiving element,
A light receiving sensitivity calculating means for calculating the light receiving sensitivity of the light receiving element based on the measured value, and a light receiving sensitivity for determining whether or not the calculated value of the light receiving sensitivity is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range. When the determination result and the determination result of the light receiving sensitivity determining device are affirmative, the amplification degree of the amplifier for amplifying the output of the light receiving element is changed or the fire is detected according to the calculated value of the light receiving sensitivity. The light receiving sensitivity automatic compensating means including the light receiving sensitivity compensating means for compensating the deterioration of the light receiving sensitivity by changing the threshold value is provided.

The radiation-type fire detector according to the invention of claim 3 is the radiation-type fire sensor according to the invention of claim 1 or 2, wherein the compensation by the automatic compensating means for the stain or the light-receiving sensitivity is limited. When the limit is reached or when the limit is exceeded, a limit reporting means for reporting to the outside a signal indicating that the contamination compensation of the translucent cover or the light receiving sensitivity compensation of the light receiving element has reached its limit or a signal indicating that the limit has been exceeded. It is equipped with.

According to a fourth aspect of the present invention, there is provided a radiant fire detector comprising a translucent cover which transmits radiant light emitted from a flame, and a translucent cover which is provided inside the translucent cover. In a radiant fire detector having a light receiving element for receiving the transmitted light of, and a means for detecting a fire based on a detection signal of the light receiving element, the radiant fire detector is provided outside the translucent cover,
A first test light-emitting element that emits a first pseudo-flame signal when driven by a first operation test means and transmits the light-transmitting cover to illuminate the light-receiving element; and the first test light-emitting element. A first element for driving an element to emit a first pseudo-flame signal to irradiate the light receiving element, and testing whether the means for detecting the fire normally operates based on a detection signal of the light receiving element. An operation test means, provided inside the translucent cover,
A second test light emitting element that emits a second pseudo flame signal by driving the second operation test means and directly or indirectly irradiates the light receiving element, and a second test light emitting element are driven. Second operation test means for illuminating the light receiving element by emitting a second pseudo flame signal and testing whether the means for detecting the fire operates normally based on the detection signal of the light receiving element. A light extinction ratio calculating unit that measures a detection signal level of the light receiving element during a test of the first operation testing unit and calculates a light extinction ratio of the translucent cover based on the measured value.
The calculated value of the extinction ratio is a stain degree determining unit that determines whether or not the lower limit value of the preset extinction rate allowable range is greater than or equal to the lower limit value, and if the determination result of the stain degree determining unit is affirmative, According to the calculated value of the extinction ratio, the amplification degree of the amplifier that amplifies the output of the light receiving element is changed, or the threshold value for detecting a fire is changed to compensate for the contamination of the translucent cover. Automatic compensation and limit notification of pollution, including a pollution compensation means and a pollution limit reporting means for externally reporting a signal to the effect that the limit of the pollution compensation is exceeded, when the judgment result of the pollution degree judging means is negative. Means for measuring the detection signal level of the light receiving element during the test of the second operation testing means, and calculating the light receiving sensitivity of the light receiving element based on the measured value; The calculated value is
If the determination result of the light receiving sensitivity determining means for determining whether or not it is equal to or more than the lower limit value of the preset light receiving sensitivity allowable range, and the determination result of the light receiving sensitivity determining means is affirmative, according to the calculated value of the light receiving sensitivity, The light-receiving sensitivity compensating means for compensating the deterioration of the light-receiving sensitivity by changing the amplification degree of the amplifier for amplifying the output of the light-receiving element or changing the threshold value for detecting a fire, and the light-receiving sensitivity determining means. When the determination result is negative, the light-receiving sensitivity automatic compensation and limit reporting means including a light-receiving sensitivity limit reporting means for reporting a signal indicating that the light-receiving sensitivity compensation limit has been exceeded are provided.

According to a fifth aspect of the present invention, there is provided a radiant fire detector, which comprises a translucent cover for transmitting radiant light emitted from a flame and a translucent cover provided inside the translucent cover. In a radiant fire detector having a light receiving element for receiving the transmitted light of, and a means for detecting a fire based on a detection signal of the light receiving element, the radiant fire detector is provided outside the translucent cover,
A first test light-emitting element that emits a first pseudo-flame signal when driven by a first operation test means and transmits the light-transmitting cover to illuminate the light-receiving element; and the first test light-emitting element. A first element for driving an element to emit a first pseudo-flame signal to irradiate the light receiving element, and testing whether the means for detecting the fire normally operates based on a detection signal of the light receiving element. An operation test means, provided inside the translucent cover,
A second test light emitting element that emits a second pseudo flame signal by driving the second operation test means and directly or indirectly irradiates the light receiving element, and a second test light emitting element are driven. Second operation test means for irradiating the light receiving element by emitting a second pseudo flame signal to test whether the fire sensing means operates normally based on the detection signal of the light receiving element. And a light extinction ratio calculation unit that measures a detection signal level of the light receiving element during the test of the first operation test unit and calculates a light extinction ratio of the translucent cover based on the measurement value. The calculated value of the extinction ratio is equal to or greater than the lower limit value of the preset extinction ratio allowable range and is equal to or greater than the preset lower limit value that is slightly higher than the lower limit value. First and second contamination degree determination for determining whether each is And the result of the determination by the first contamination degree determination means is affirmative, the amplification factor of the amplifier for amplifying the output of the light receiving element is changed or a fire is caused according to the calculated value of the extinction ratio. If the determination result of the stain compensating means for compensating the stain of the translucent cover and the second stain degree determining means is negative, the translucent cover is cleaned. And a pollution status reporting means for externally reporting a signal indicating that the above is required, and, when the determination result of the first contamination degree determining means is negative, for reporting a signal indicating that the limit of the pollution compensation has been exceeded to the outside. A light receiving device that measures the detection signal level of the light receiving element and calculates the light receiving sensitivity of the light receiving element based on the measured value at the time of the test of the automatic compensation and situation notification means for contamination including the Sensitivity calculation means and the calculated value of the light receiving sensitivity , It is determined whether it is equal to or more than the lower limit value of the preset light receiving sensitivity allowable range and whether it is equal to or more than the preset lower limit value slightly higher than the lower limit value. First and second light receiving sensitivity determining means, which are respectively performed, and the first and second light receiving sensitivity determining means.
When the determination result of the light receiving sensitivity determining means is positive, the amplification factor of the amplifier for amplifying the output of the light receiving element is changed according to the calculated value of the light receiving sensitivity, or a threshold value for detecting a fire is set. If the result of the determination by the light receiving sensitivity compensating means for changing and compensating for the deterioration of the light receiving sensitivity and the second light receiving sensitivity determining means is negative, an advance signal of the light receiving sensitivity deterioration is notified to the outside, and the first signal is sent. When the determination result of the light receiving sensitivity determining means of No. 1 is negative, the light receiving sensitivity automatic notification and status notifying means including a light receiving sensitivity status notifying means for externally sending a signal indicating that the limit of the light receiving sensitivity compensation is exceeded. It is equipped with.

In the radiant fire detector according to the invention of claim 6, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the flames in each of the set sensing areas are radiated respectively. A radiant light that is transmitted through each of the sensing regions in each direction, and a translucent cover,
Based on a plurality of light-receiving elements provided inside the light-transmitting cover and receiving transmitted light of each direction of the light-transmitting cover for each sensing region, and a detection signal of each of the plurality of light-receiving elements. A radiant fire detector having means for detecting a fire for each of the plurality of sensing areas, wherein each of the plurality of sensing areas is provided outside the translucent cover,
A plurality of first pseudo flame signals are emitted by the driving of the sensing areas by the first operation test means, and the plurality of first irradiating elements each of which senses the light receiving elements of the sensing areas through the transparent cover. One test light-emitting element and the plurality of first
Driving the test light-emitting elements individually to emit a first pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements for each of the plurality of light-receiving elements based on the detection signal. First operation test means for respectively testing whether or not the fire sensing means operates normally for each sensing area, and each of the plurality of sensing areas is provided inside the translucent cover, A plurality of second test devices that emit second pseudo flame signals by driving the respective sensing areas by the second operation test means and directly or indirectly irradiate the light receiving elements of the respective sensing areas. A light emitting device and the plurality of second
Driving the test light-emitting elements individually to emit the second pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements based on the detection signal for each of the light-receiving elements. Second operation test means for testing whether or not the fire detecting means normally operates for each sensing area, and irradiation for each of the plurality of sensing areas at the time of testing the first operation testing means. And a light extinction ratio calculating means for calculating a light extinction ratio for each of a plurality of sensing area directions of the translucent cover based on the measured values. Contamination degree determining means for determining whether or not the calculated value of the extinction rate for each direction is equal to or greater than the lower limit value of the preset extinction rate allowable range, and determination of each sensing area by the contamination degree determining means. If the result is positive, decrease in the direction of the relevant sensing area. Depending on the calculated value of the rate, the amplification degree of the amplifier that amplifies the output of the light receiving element in the corresponding sensing area is changed, or the threshold value for detecting the fire is changed, and each sensing area of the translucent cover is changed. If the result of discrimination of each sensing area by the contamination compensating means for compensating the contamination in each direction and the contamination degree determining means is negative, a signal indicating that the contamination compensation in the corresponding sensing area direction exceeds the limit is output to the outside. Automatic detection of contamination and a limit reporting means including a contamination limit reporting means for reporting, and a detection signal level of a light receiving element irradiated to each of the plurality of sensing areas during the test of the second operation testing means, respectively. Then, the light receiving sensitivity calculating means for calculating the light receiving sensitivity of the light receiving element for each of the sensing regions based on the respective measured values, and the light receiving sensitivity permission for which the calculated value of the light receiving sensitivity for each of the sensing regions is preset. A light-receiving sensitivity determining means for determining range to or greater than the lower limit value, respectively,
When the result of the determination of each sensing area by the light receiving sensitivity determining means is affirmative, according to the calculated value of the light receiving sensitivity of the corresponding sensing area,
A light receiving device that compensates for the deterioration of the light receiving sensitivity of each of the plurality of sensing regions by changing the amplification degree of an amplifier that amplifies the output of the light receiving element of the corresponding sensing region or by changing the threshold value that detects a fire. When the determination result of each sensing area by the sensitivity compensating means and the light receiving sensitivity determining means is negative, the light receiving sensitivity limit reporting means for reporting to the outside a signal indicating that the compensation of the light receiving sensitivity of the corresponding sensing area exceeds the limit. It is provided with automatic compensation of light receiving sensitivity including and and limit reporting means.

In the radiant fire detector according to the present invention of claim 7, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the flames in each of the set sensing areas are respectively radiated. A radiant light that is transmitted through each of the sensing regions in each direction, and a translucent cover,
Based on a plurality of light-receiving elements provided inside the light-transmitting cover and receiving transmitted light of each direction of the light-transmitting cover for each sensing region, and a detection signal of each of the plurality of light-receiving elements. A radiant fire detector having means for detecting a fire for each of the plurality of sensing areas, wherein each of the plurality of sensing areas is provided outside the translucent cover,
A plurality of first pseudo flame signals are emitted by the driving of the sensing areas by the first operation test means, and the plurality of first irradiating elements each of which senses the light receiving elements of the sensing areas through the transparent cover. One test light-emitting element and the plurality of first
Driving the test light-emitting elements individually to emit a first pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements for each of the plurality of light-receiving elements based on the detection signal. First operation test means for respectively testing whether or not the fire sensing means operates normally for each sensing area, and each of the plurality of sensing areas is provided inside the translucent cover, A plurality of second test devices that emit second pseudo flame signals by driving the respective sensing areas by the second operation test means and directly or indirectly irradiate the light receiving elements of the respective sensing areas. A light emitting device and the plurality of second
Driving the test light-emitting elements individually to emit the second pseudo flame signal, irradiating the light-receiving elements for each of the plurality of sensing regions individually, and the plurality of light-receiving elements based on the detection signal for each of the light-receiving elements. Second operation test means for testing whether or not the fire detecting means normally operates for each sensing area, and irradiation for each of the plurality of sensing areas at the time of testing the first operation testing means. And a light extinction ratio calculating means for calculating a light extinction ratio for each of a plurality of sensing area directions of the translucent cover based on the measured values. The calculated value of the dimming rate for each direction is determined whether it is equal to or more than the lower limit value of the preset extinction ratio allowable range, and the preset value is set to a value slightly higher than the lower limit value. The first and the respective determinations as to whether or not the lower limit value is exceeded And 2 defacement degree determination means, when the determination result of each sensing region by fouling degree discriminating means of the first is positive, according to the calculated value of the extinction ratio of the relevant sensing area direction,
The amplification factor of the amplifier that amplifies the output of the light receiving element in the corresponding sensing area is changed, or the threshold value for detecting a fire is changed to compensate the contamination of the light-transmitting cover in each sensing area direction. When the result of the determination of each of the sensing areas by the stain compensating means and the second stain degree determining means is negative, a signal indicating that the light-transmitting cover needs to be cleaned in the corresponding sensing area direction is sent to the outside, respectively. Also, when the determination result of each of the sensing areas by the first contamination degree determining means is negative, there is included pollution status reporting means for reporting to the outside a signal indicating that the pollution compensation in the corresponding sensing area direction has exceeded the limit. At the time of the test of the automatic pollution compensation and status reporting means and the second operation testing means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and each measured value and light receiving sensitivity are measured. Basis A light-receiving sensitivity calculating means for calculating a ratio of the light-receiving sensitivity to each of the sensing areas as the light-receiving sensitivity of the light-receiving element, and a calculated value of the light-receiving sensitivity for each of the sensing areas, the lower limit of the preset light-receiving sensitivity allowable range. First and second light receiving sensitivity determining means for determining whether or not the above is satisfied and determining whether or not the predetermined lower limit is set to a value slightly higher than the lower limit, and First
When the determination result of each sensing area by the light-receiving sensitivity determining means of is affirmative, according to the calculated value of the light-receiving sensitivity of the corresponding sensing area,
Light-receiving sensitivity that compensates for deterioration of light-receiving sensitivity of each of the plurality of sensing areas by changing the amplification degree of an amplifier that amplifies the output of the light-receiving element in the corresponding sensing area or by changing the threshold value for detecting fire. When the determination result of each sensing area by the compensating means and the second light receiving sensitivity determining means is negative, a prior signal of the light receiving sensitivity deterioration of the corresponding sensing area is notified to the outside, and the first light receiving sensitivity determination is performed. When the determination result of each sensing area by the means is negative, the light receiving sensitivity automatic compensation and status notification including a light receiving sensitivity status reporting means for externally reporting a signal indicating that the light receiving sensitivity compensation of the corresponding sensing area exceeds the limit And means.

[0014]

In the invention according to the first aspect, the translucent cover that transmits the radiant light emitted from the flame and the light transmitted through the translucent cover that is provided inside the translucent cover are received. In the radiant fire detector, the first test light-emitting element is provided outside the translucent cover. The first pseudo-flame signal is emitted by driving the operation test means, and the light-receiving element is irradiated with light through the light-transmitting cover. The first operation test means drives the first test light emitting element to emit a first pseudo flame signal to irradiate the light receiving element. The automatic compensation means for pollution is
Includes a light extinction ratio calculating unit, a stain degree determining unit, and a stain compensating unit, and the dimming ratio calculating unit measures the detection signal level of the light receiving element at the time of the test of the first operation test unit, and the measured value is obtained. Based on this, the extinction ratio of the translucent cover is calculated.
The stain degree determining means determines whether or not the calculated value of the extinction ratio is equal to or higher than the lower limit value of the preset extinction ratio allowable range. If the determination result of the contamination degree determination means is affirmative, the automatic pollution compensation means changes the amplification degree of an amplifier that amplifies the output of the light receiving element according to the calculated value of the extinction ratio, or The threshold for detecting fire is changed to compensate for the fouling of the translucent cover.

According to the second aspect of the present invention, the transparent cover that transmits the radiant light emitted from the flame, and the light transmitted from the transparent cover that is provided inside the transparent cover are received. In a radiant fire detector having a light receiving element and means for detecting a fire based on a detection signal of the light receiving element, the second test light emitting element is provided inside the translucent cover, and the second test light emitting element is provided. The second pseudo flame signal is emitted by driving the operation test means and directly or indirectly irradiates the light receiving element. The second operation test means drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element. The light receiving sensitivity automatic compensating means includes a light receiving sensitivity calculating means, a light receiving sensitivity determining means, and a light receiving sensitivity compensating means, and the light receiving sensitivity calculating means determines the detection signal level of the light receiving element at the time of the test of the second operation testing means. The light receiving sensitivity of the light receiving element is calculated based on the measured value. The light receiving sensitivity determining means determines whether or not the calculated value of the light receiving sensitivity is equal to or higher than a lower limit value of a preset light receiving sensitivity allowable range. The light-receiving sensitivity compensating means changes the amplification degree of an amplifier for amplifying the output of the light-receiving element or causes a fire in accordance with the calculated value of the light-receiving sensitivity when the determination result of the light-receiving sensitivity determining means is affirmative. The threshold value to be sensed is changed to compensate for the deterioration of the light receiving sensitivity.

In the invention according to claim 3, limit notification means is added to the radiant fire sensor according to claim 1 or 2, and the limit notification means automatically compensates for the stain or the light receiving sensitivity. When the compensation by the means reaches the limit or exceeds the limit, a signal indicating that the stain compensation of the translucent cover or the light receiving sensitivity compensation of the light receiving element has reached the limit or a signal indicating that the limit has been exceeded is transmitted to the outside. report.

In the invention according to claim 4, a translucent cover for transmitting radiant light emitted from a flame, and a transmitted light from the translucent cover provided inside the translucent cover are received. In the radiant fire detector, the first test light-emitting element is provided outside the translucent cover. The first pseudo-flame signal is emitted by driving the operation test means, and the light-receiving element is irradiated with light through the light-transmitting cover. The first operation test means is the first
Driving the test light emitting element to emit the first pseudo flame signal to irradiate the light receiving element, and test whether the means for detecting the fire operates normally based on the detection signal of the light receiving element. To do. The second test light-emitting element is provided inside the translucent cover, emits a second pseudo flame signal by driving the second operation test means, and directly or indirectly irradiates the light-receiving element. . Second operation test means drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element, and senses the fire based on a detection signal of the light receiving element. Test whether the means work properly. The automatic pollution compensation and limit notification means includes a light reduction rate calculation means, a contamination degree determination means, a pollution compensation means and a contamination limit notification means, and the light reduction rate calculation means, during the test of the first operation test means, The detection signal level of the light receiving element is measured, and the extinction ratio of the translucent cover is calculated based on the measured value. The degree of contamination determination means, the calculated value of the extinction ratio,
It is determined whether or not the value is equal to or larger than the lower limit value of the preset extinction ratio allowable range. When the determination result of the contamination degree determination means is affirmative, the pollution compensation means changes the amplification degree of the amplifier for amplifying the output of the light receiving element or causes a fire in accordance with the calculated value of the extinction ratio. The sensed threshold is varied to compensate for fouling of the translucent cover. The pollution limit reporting means reports a signal indicating that the pollution compensation limit has been exceeded to the outside when the determination result of the pollution level determining means is negative. Automatic compensation of photosensitivity and limit notification means
The light receiving sensitivity calculating means, the light receiving sensitivity determining means, the light receiving sensitivity compensating means, and the light receiving sensitivity limit reporting means are included, and the light receiving sensitivity calculating means measures the detection signal level of the light receiving element at the time of the test of the second operation testing means. The light receiving sensitivity of the light receiving element is calculated based on the measured value. The light receiving sensitivity determining means determines whether or not the calculated value of the light receiving sensitivity is equal to or higher than the lower limit value of the preset light receiving sensitivity allowable range. The light-receiving sensitivity compensating means changes the amplification degree of an amplifier for amplifying the output of the light-receiving element or causes a fire in accordance with the calculated value of the light-receiving sensitivity when the determination result of the light-receiving sensitivity determining means is affirmative. The threshold value to be sensed is changed to compensate for the deterioration of the light receiving sensitivity. The light-reception sensitivity limit reporting means reports a signal indicating that the light-reception sensitivity compensation limit has been exceeded to the outside when the determination result of the light-reception sensitivity determination means is negative.

In the invention according to claim 5, a translucent cover for transmitting radiant light emitted from a flame, and a transmitted light from the translucent cover provided inside the translucent cover are received. In the radiant fire detector, the first test light-emitting element is provided outside the translucent cover. The first pseudo-flame signal is emitted by driving the operation test means, and the light receiving element is irradiated with light through the transparent cover. The first operation test means is the first
Driving the test light emitting element to emit the first pseudo flame signal to irradiate the light receiving element, and test whether the means for detecting the fire operates normally based on the detection signal of the light receiving element. To do. The second test light-emitting element is provided inside the translucent cover, emits a second pseudo flame signal by driving the second operation test means, and directly or indirectly irradiates the light-receiving element. . Second operation test means drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element, and senses the fire based on a detection signal of the light receiving element. Test whether the means work properly. The automatic pollution compensation and status notification means includes a light reduction rate calculation means, first and second pollution degree determination means, a pollution compensation means, and a pollution status notification means, and the light reduction rate calculation means includes the first operation. During the test of the test means, the detection signal level of the light receiving element is measured, and the extinction rate of the translucent cover is calculated based on the measured value. The first and second contamination degree determining means determines whether or not the calculated value of the extinction ratio is equal to or higher than the lower limit value of the preset extinction ratio allowable range, and slightly more than the lower limit value. It is determined whether the upper value is equal to or more than the preset lower limit value.
When the determination result of the first contamination degree determination unit is affirmative, the pollution compensation unit changes the amplification degree of the amplifier that amplifies the output of the light receiving element according to the calculated value of the extinction ratio, Alternatively, the threshold value for detecting fire is changed to compensate for the contamination of the translucent cover. The pollution status reporting means is
When the determination result of the second stain degree determining means is negative, a signal indicating that the transparent cover needs to be cleaned is sent to the outside, and the determination result of the first stain degree determining means is negative. In this case, a signal indicating that the pollution compensation limit has been exceeded is reported to the outside. The light receiving sensitivity automatic compensation and status reporting means includes a light receiving sensitivity calculating means, first and second light receiving sensitivity determining means, light receiving sensitivity compensating means, and light receiving status reporting means.
The light receiving sensitivity calculation means measures the detection signal level of the light receiving element during the test of the second operation testing means, and calculates the light receiving sensitivity of the light receiving element based on the measured value. The first and second light receiving sensitivity determining means determine whether or not the calculated value of the light receiving sensitivity is equal to or more than the lower limit value of the preset light receiving sensitivity allowable range, and slightly above the lower limit value. Whether or not the value is equal to or larger than the preset lower limit value is determined. The light receiving sensitivity compensating means changes the amplification degree of the amplifier for amplifying the output of the light receiving element in accordance with the calculated value of the light receiving sensitivity when the determination result of the first light receiving sensitivity determining means is affirmative, Alternatively, the threshold value for detecting fire is changed to compensate for the deterioration of the light receiving sensitivity. The light-reception-sensitivity status notification means reports an advance signal of light-reception sensitivity deterioration to the outside when the determination result of the second light-reception sensitivity determination means is negative, and the determination result of the first light-reception sensitivity determination means is negative. In this case, a signal to the effect that the limit of the light-receiving sensitivity compensation has been exceeded is reported to the outside.

In the invention according to the sixth aspect, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the radiant light emitted from the flame in each of the plurality of sensing areas set is set. A light-transmitting cover for transmitting the light in each direction of the respective sensing areas, and a plurality of light-transmitting covers provided inside the light-transmitting cover for receiving the light transmitted in the respective directions of the light-transmitting cover for each of the sensing areas. In the radiant fire detector, the plurality of first light-emitting elements for testing are provided, and the plurality of first light-emitting elements for testing are provided in the radiation-type fire detector, the plurality of first light-emitting elements for detecting the fire in each of the plurality of sensing areas based on the detection signals of the plurality of light-receiving elements. , Each of the plurality of sensing areas is provided outside the light-transmitting cover, and each of the sensing areas is driven by the first operation test means to emit a first pseudo-flame signal to transmit the light-transmitting light. sex It passes through the bar irradiates each light receiving element of the respective sensing region. The first operation test means is
The plurality of first test light emitting elements are individually driven to
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. Each test whether it works. The plurality of second test light-emitting elements are provided inside the light-transmitting cover for each of the plurality of sensing areas, and are driven by the second operation test unit for each of the sensing areas to generate the second testing light-emitting element. A pseudo flame signal is emitted to directly or indirectly irradiate the light receiving element of each of the sensing areas. The second operation test means individually drives the plurality of second test light emitting elements to emit a second pseudo flame signal, and individually irradiates the light receiving elements of each of the plurality of sensing regions, Based on the detection signal of each light receiving element, it is tested for each of the plurality of sensing areas whether or not the means for sensing a fire operates normally. The automatic pollution compensation and limit notification means includes a light reduction rate addition means, a contamination degree determination means, a contamination compensation means, and a contamination limit notification means.
The extinction ratio calculation means measures the detection signal level of the light receiving element irradiated to each of the plurality of sensing regions during the test of the first operation test means, and the light transmission rate is calculated based on each measurement value. The extinction rate is calculated for each of the plurality of sensing area directions of the property cover. The stain degree determining means determines whether or not the calculated value of the light reduction rate for each direction is equal to or more than the lower limit value of the preset light reduction rate allowable range. The stain compensating means is an amplifier for amplifying the output of the light receiving element in the corresponding sensing area according to the calculated value of the extinction ratio in the corresponding sensing area when the result of the determination of each sensing area by the stain degree judging means is affirmative. Is changed or the threshold value for detecting a fire is changed to compensate the contamination of the translucent cover in each sensing area direction. When the determination result of each of the sensing areas by the contamination degree determining means is negative, the pollution limit reporting means reports a signal to the outside that the pollution compensation in the direction of the relevant sensing area exceeds the limit. The means for automatically compensating for the light receiving sensitivity and the limit reporting means are the light receiving sensitivity calculating means,
The light-receiving sensitivity calculating unit includes a light-receiving sensitivity determining unit, a light-receiving sensitivity compensating unit, and a light-receiving sensitivity limit reporting unit, and the light-receiving sensitivity calculating unit detects a light-receiving element irradiated to each of the plurality of sensing regions during the test of the second operation testing unit. The signal levels are measured, and the light receiving sensitivities of the light receiving elements for each of the sensing areas are calculated based on the measured values. The light receiving sensitivity determining means determines whether or not the calculated value of the light receiving sensitivity for each of the sensing areas is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range. The light receiving sensitivity compensating means is an amplifier for amplifying the output of the light receiving element in the corresponding sensing area according to the calculated value of the light receiving sensitivity of the corresponding sensing area when the result of the determination of each sensing area by the light receiving sensitivity determining means is affirmative. The amplification factor is changed or the threshold value for detecting a fire is changed to compensate the deterioration of the light receiving sensitivity of each of the plurality of sensing areas. The light-reception sensitivity limit reporting means reports a signal to the outside that the compensation of the light-reception sensitivity of the corresponding sensing area exceeds the limit, when the result of discrimination of each sensing area by the light-reception sensitivity determining means is negative.

In the invention according to claim 7, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the radiant light emitted from the flame in each of the plurality of sensing areas set is set. A plurality of light-transmitting covers that transmit the respective sensing areas in different directions, and a plurality of light-transmitting covers that are provided inside the light-transmitting cover and that receive the light transmitted in the respective directions of the light-transmitting cover for each of the sensing areas. Of the plurality of light receiving elements, and a means for detecting a fire in each of the plurality of sensing areas based on the detection signal of each of the plurality of light receiving elements, the plurality of first test light emitting elements are provided. , Each of the plurality of sensing areas is provided outside the translucent cover, and each of the sensing areas is driven by the first operation test means to emit a first pseudo-flame signal. sex It passes through the bar irradiates each light receiving element of the respective sensing region. The first operation test means is
The plurality of first test light emitting elements are individually driven to
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. Each test whether it works. The plurality of second test light-emitting elements are provided inside the light-transmitting cover for each of the plurality of sensing areas, and are driven by the second operation test unit for each of the sensing areas to generate the second testing light-emitting element. A pseudo flame signal is emitted to directly or indirectly irradiate the light receiving element of each of the sensing areas. The second operation test means individually drives the plurality of second test light emitting elements to emit a second pseudo flame signal, and individually irradiates the light receiving elements of each of the plurality of sensing regions, Based on the detection signal of each light receiving element, it is tested for each of the plurality of sensing areas whether or not the means for sensing a fire operates normally. The automatic pollution compensation and status notification means includes a light reduction rate calculation means, first and second pollution degree determination means, a pollution compensation means, and a pollution status notification means, and the light reduction rate calculation means includes the first operation. During the test of the test means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and the reduction of each of the plurality of sensing areas of the translucent cover is performed based on the measured value. Calculate the light rate respectively. The first and second contamination degree determining means determines whether or not the calculated value of the extinction ratio for each direction is equal to or more than the lower limit value of the preset extinction ratio allowable range and the lower limit. It is determined whether or not the value is slightly higher than the value and is equal to or larger than the preset lower limit value. The stain compensating means outputs the output of the light receiving element of the corresponding sensing area according to the calculated value of the extinction ratio in the corresponding sensing area when the result of the determination of each sensing area by the first stain degree judging means is affirmative. The amplification factor of the amplifying amplifier is changed, or the threshold value for detecting a fire is changed to compensate for the contamination of the translucent cover in each direction of the sensing area. When the result of the determination of each sensing area by the second contamination degree determining means is negative, the pollution status reporting means reports a signal to the outside that cleaning of the translucent cover in the corresponding sensing area direction is required. When the result of the determination of each sensing area by the first stain degree determining means is negative, a signal indicating that the stain compensation in the corresponding sensing area direction has exceeded the limit is sent to the outside. The light receiving sensitivity automatic compensation and status reporting means includes a light receiving sensitivity calculating means, first and second light receiving sensitivity determining means, light receiving sensitivity compensating means, and light receiving sensitivity status reporting means, and the light receiving sensitivity calculating means includes the second light receiving sensitivity calculating means. During the test of the operation test means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and the light receiving sensitivity of the light receiving element of each of the sensing areas is calculated based on each measured value. To do. The first and second light receiving sensitivity determining means determine whether or not the calculated value of the light receiving sensitivity for each of the sensing areas is equal to or more than the lower limit value of the preset light receiving sensitivity allowable range, and from the lower limit value. It is determined whether or not the value is slightly above the preset lower limit value. The light receiving sensitivity compensating means, when the discrimination result of each sensing region by the first light receiving sensitivity discriminating means is affirmative,
Depending on the calculated value of the light receiving sensitivity of the relevant sensing area, the amplification degree of the amplifier that amplifies the output of the light receiving element of the relevant sensing area is changed, or the threshold value for detecting a fire is changed,
The deterioration of the light receiving sensitivity of each of the plurality of sensing areas is compensated.
The light-reception-sensitivity status reporting means reports the advance signal of the light-reception sensitivity deterioration of the corresponding sensing area to the outside when the discrimination result of each sensing area by the second light-reception sensitivity discriminating means is negative, and also the first signal When the determination result of each sensing area by the light-receiving sensitivity determining means is negative, a signal indicating that the light-receiving sensitivity compensation of the corresponding sensing area exceeds the limit is notified to the outside.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a radiation type fire detector showing an embodiment of the present invention. 2 is a structural view of the radiant fire detector of FIG. 1, and FIG. 2 (a) is a plan view thereof,
(B) has shown the sectional view. 3 is a diagram showing two sensing areas on the left side and the right side of the radiant fire detector of FIG. 1, and FIG. 4 is a diagram of the light receiving element and the internal light emitting diode (LE) of FIG.
It is a figure which shows the positional relationship with D).

First, it will be explained that a single fire sensor can have multiple sensing areas. When the radiant fire detector of the embodiment of FIG. 1 is installed on a wall surface, for example, the central axis is 45 degrees to the left and right with respect to the front direction (direction perpendicular to the wall surface) of the fire sensor. It has three almost independent fire sensing areas in three-dimensional space. FIG. 3 shows the left and right sensing areas in a horizontal plane when the radiant fire detector of FIG. 1 is installed on a wall surface,
For example, the sensing area can be up to about 50 meters in a linear distance perpendicular to the light receiving surface of the light receiving element.
The radiant light emitted from the flames in the sensing areas on the left and right sides of FIG. 3 are respectively received by the light receiving elements arranged such that the light receiving directional characteristics thereof match the sensing area in each direction.

1 to 4, 1L and 1R are blue light components (for example, wavelengths of 0.6 to 0.7) of infrared light emitted from the flames generated in the left and right sensing areas, respectively.
It is a blue light receiving element for separately receiving a component of about 5 μm, which is also referred to as a short wavelength component in the present invention). In this embodiment, both photodiodes are used. 2L, 2R
Is a red light component (for example, a component having a wavelength of about 0.8 to 2 μm) in the infrared light emitted from the same flame generated in each of the left and right sensing areas, and is a long wavelength component in the present invention. Red light receiving element for separately receiving light), and in this embodiment, a pyroelectric element (an element that generates a voltage or a pyroelectric current when infrared rays are absorbed to cause a temperature change) is used together. The photodiode 1L and the pyroelectric element 2L serve as a light receiving sensor in the left sensing area of FIG. 3, and the photodiode 1R and the pyroelectric element 2R serve as a light receiving sensor in the right sensing area of FIG. The light component is detected separately.

3Lb and 3Lr are blue light receiving photodiodes 1 on the left side when performing a light receiving sensitivity test, respectively.
L and the left side red light receiving pyroelectric element 2L are separately irradiated, so that red light in the same band as the flame flashes and emits at a flame fluctuation frequency of about 8 to 12 Hz.
In this embodiment, a light emitting diode is used, and it is provided inside the light receiving glass 7. Similarly, 3Rb, 3Rr
When the light sensitivity test is performed, the red light in the same band as the flame that separately illuminates the right blue light receiving photodiode 1R and the right red light receiving pyroelectric element 2R blinks at about 8 to 12 Hz. The second test light-emitting element for the right side, which emits light, is provided inside the light-receiving glass 7 in this embodiment, and is hereinafter referred to as the right-side internal LED. Internal LED3 on the left or right side
The positional relationship between Lb, 3Lr, 3Rb, 3Rr and the photodiodes 1L, 1R and the pyroelectric elements 2L, 2R which are light receiving elements is such that direct irradiation is performed as shown in FIG. 4 in this embodiment. ing. Instead of direct irradiation, the inner surface of the light receiving glass 7 or the photodiode 1
L, 1R and the pyroelectric elements 2L, 2R may be reflected by the inner surface of the optical filter provided on the front surface to be irradiated, that is, indirectly irradiated. .

4L and 4R are provided outside the light-receiving glass 7 to test the degree of contamination (specifically, the light transmittance) of the light-transmitting portions on the left and right sides of the light-receiving glass 7, respectively. The red light in the same band as
The first and second light-emitting elements for the first test for flashing and emitting light at a frequency of Hz, and at the time of a stain level test, the pseudo-light of the flame emitted from the left-side or right-side direction is received by the light-receiving glass 7 respectively. The photodiode 1L on the left side and the photodiode 1R on the right side, which are inside, are separately illuminated. In this embodiment, a light emitting diode is used as a light emitting element, which will be hereinafter referred to as left and right external LEDs.

Reference numerals 5L and 5R are operation / fire indicator lights on the left side and the right side, respectively.
A color LED is used, a green LED is used as an operation indicator, and a red LED is used as a fire indicator. The display state by the two-color LED is performed based on the instruction of the receiver which transmits the flame detection signal to the receiver by the fire detector and receives the flame detection signal. In this embodiment, the flame is first displayed. Flashing lighting by the green LED is detected, and flashing lighting by the red LED is carried out when the second continuous flame after the initial detection signal is restored (reset) by the receiver is detected. After the continuous flame detection signal is confirmed three or more times by the receiver, the red LED continuously lights. In addition to the above three display states, the two-color LED display mode is often combined with flashing lighting (the flashing frequency may be low or high) and continuous lighting or extinction for each of the two LEDs. Possible display modes are. Table 1 below shows an example of the display mode.

[0027]

[Table 1]

In this embodiment, when an inspection test is carried out by receiving the irradiation light from the pseudo flame light source of the inspection tester on the fire detector, it is determined that the inspection test by the tester is underway. In order to notify to, the light modulated at a frequency different from the frequency band included in the flame from the inspection notification signal generating means provided in advance in the tester,
For example, it emits light that blinks at about 500 Hz. Reference numeral 6 is a light receiving element for the inspection notification signal generated from this tester, which is a photodiode for receiving the light blinking at about 500 Hz in this example. The inspection tester will be described with reference to FIGS. 6 and 7. Reference numeral 7 denotes a light-receiving glass as a light-transmitting cover, which transmits a flame signal when a fire occurs through the light-receiving glass 7 and is received by the photodiodes 1L, 1R and the pyroelectric elements 2L, 2R. 8L and 8R are the external LED 4L on the left side and the operation / fire indicator lamp 5L, respectively.
And a transparent glass provided on the right external LED 4R and the operation / fire indicator light 5R. 9A and 9B are case A and case B of this fire detector, respectively.

Reference numerals 11L and 11R in FIG. 1 denote preamplifiers for amplifying received light output signals of the photodiodes 1L and 1R, respectively, and reference numerals 12L and 12R denote pyroelectric elements 2L and 2R, respectively.
Preamplifier for amplifying the received light output signal of
R, 14L and 14R are preamplifiers 11L and 11L, respectively.
An amplifier that amplifies the output signals of R, 12L, and 12R. Here, the preamplifiers 11L, 11R, 12L, 1
Since the 2R and the amplifiers 13L, 13R, 14L, and 14R amplify only the flame signal of Mako among the output signals obtained from the respective light receiving elements, for example, an alternating current of about 8 to 12 Hz, which is the fluctuation frequency band of the flame at the time of fire. It is designed so that only the signal is extracted and amplified by a built-in band pass filter (BPF). For example, it is designed as a narrow band amplifier incorporating an active filter, a direct current component of an input signal and a high band component of about 12 Hz or more are attenuated, and only the narrow band signal is amplified.

Further, the preamplifier 11L and the amplifier 13L, 1
The two-stage amplifier circuit consisting of 2L and 14L, 11R and 13R, or 12R and 14R has high gain and high sensitivity, so even in the case of a distant or small fire where the radiant energy of the fire is small, sufficient measurement values can be obtained. Is used as a circuit to obtain. Since the amplifier circuit including only the preamplifier 11L, 12L, 11R, or 12R has a low gain and low sensitivity, the output of the amplifier circuit does not saturate even when the radiant energy of a fire is large and the measured value is correct. Is used as a circuit to obtain. 15L-18L and 15R-
18R is a smoothing circuit, which is composed of, for example, a resistor and a capacitor, receives the output signal of the preamplifier or the amplifier, outputs a smoothed signal of the input signal, and supplies the smoothed signal to the sensor control circuit 20.

The sensor control circuit 20 selects either the output of the smoothing circuit to which the preamplifier output is input or the output of the smoothing circuit to which the amplifier output is input, according to the magnitude of the radiant light energy of the fire, Further, by controlling the amplification degree of the preamplifier or the amplifier, the signal value in the linear region in which the light reception signal level exists between the minute level and the saturation level is measured. Reference numeral 19 is an amplifier for amplifying the output signal of the inspection notification signal light-receiving element 6, but it is not always operable, and when the fire detector receives an inspection start permission signal from an external receiver or repeater, sensor control is performed. It is an amplifier that is set from an inoperable state to an operable state by the circuit 20.

A sensor control circuit 20 and a transmission control circuit 21 each include a microprocessor MPU, a plurality of read only memory ROMs, a plurality of random access memory RAMs, an input / output (I / O) interface, and the like. It is built-in.

FIG. 5 is a configuration block diagram showing an example of the sensor control circuit of FIG. In FIG. 5, MPU1 and R
The OM1 to ROM9, the RAM1 to RAM6 and the I / O interface are coupled to each other via a data bus and an address bus. And in this embodiment, RO
M1 is a storage area for the control program, ROM2 is a storage area for the normal range reference value of the received light output signal obtained through the light receiving element and the amplifier, ROM3 is a storage area for the correctable range threshold value of the light receiving element alone, and ROM4 is the light receiving area. A storage area for a threshold value of a stain-correctable range of a received light output signal obtained via an element and an amplifier, a ROM 5 storage area for a reference value of extinction ratio, a ROM 6 storage area for a threshold value for fire judgment, and RO
M7 is a read-only memory assigned to a storage area for address codes, type codes, etc., assigned to each fire detector for identifying a plurality of fire detectors, and a ROM 8 for each of the other auxiliary storage areas.

RAM 1 is a data work area, RAM
2 is an area for storing the extinction ratio data, RAM 3 is an area for storing a light receiving sensitivity calculated value of the light receiving element alone, RAM 4 is an area for storing a light receiving output value from the light receiving sensor, RAM 5 is a timer area, RA
M6 is a readable / writable memory assigned to each of the other auxiliary storage areas. The I / O interface is
It contains an A / D converter, a multiplexer, an output port, an input port, etc. inside. This multiplexer selects an analog input signal from the smoothing circuits 15L to 18L and 15R to 18R and the amplifier 19 and supplies the analog input signal to the A / D converter.
The / D converter converts this into digital data to enable digital signal processing within the sensor control circuit. The output port outputs a lighting control signal to, for example, the lighting circuit, and the input port receives data from the transmission control circuit 21, for example. The I / O interface includes preamplifiers 11L, 11R, 12L, 12R and an amplifier 1
Although an output port and the like for controlling the amplification degree of 3L, 13R, 14L, and 14R are also provided, they are not shown.

Reference numeral 22 denotes a signal transmitting / receiving unit, which is a receiving circuit, a data serial / parallel conversion circuit, a transmitting circuit, and a data parallel / parallel circuit.
It is composed of a serial conversion circuit or the like, and transmits / receives data to / from a receiver or a repeater via a signal transmission line under the control of the transmission control circuit 21. 23L and 23R are based on the output signal from the sensor control circuit 20, respectively, and
Lighting circuit for controlling lighting of L and 4R, 24L and 24R
Is also a lighting circuit that controls lighting of the internal LEDs 3Lb, 3Lr and 3Rb, 3Rr based on output signals from the sensor control circuit 20, respectively.

25L and 25R are based on the output signals from the sensor control circuit 20, respectively, and the operation / fire indicator lamp 5
It is a lighting control circuit for controlling lighting of L and 5R (including continuous lighting and flashing lighting). Clock circuits 26 and 27 both generate respective clock signals and supply them to the sensor control circuit 20 and the transmission control circuit 21. Reference numerals 28 and 29 are reset circuits, which generate reset signals by initial operation after power-on and by manual operation, and supply them to the sensor control circuit 20 and the transmission control circuit 21.

6A and 6B are external views of a tester for inspecting a fire detector. FIG. 6A is a side view and FIG. 6B is a front view. In FIG. 6, 31L and 31R are light emitting elements (for example, light emitting diodes) that emit light at the flame fluctuation frequency of about 8 to 12 Hz in the infrared light band of the flame, as left and right pseudo flame signals. . Further, reference numeral 32 is a check notification signal for informing the relevant fire sensor that it is undergoing an inspection test while inspecting a fire detector by this inspection tester, and a frequency higher than the fluctuation frequency of the flame ( In this embodiment, about 500H
It is a light emitting element which emits light in z). Further, as shown in (a) of FIG. 6, the inspection tester is provided with a switch for selecting one of the three positions of left side (L), right side (R), and both left and right (center position). , 8 to 12 Hz light emitting element 31L or 31R, or both of them are selected to emit light. In the following example, the case where the inspection test is performed on each of the left side (L) and the right side (R) will be described.

FIG. 7 is a view showing the positional relationship between the fire detector and the inspection tester at the time of inspection. In FIG. 7, at the time of inspection, the front surface of the inspection tester is pressed until it covers the light-receiving glass 7 of the fire detector. As a result, the light emitted from the light emitting element 31L or 31R for 8 to 12 Hz is received by the photodiode 1L and the pyroelectric element 2L or the photodiode 1R and the pyroelectric element 2R, respectively.
The light emitted from the 0 Hz light emitting element 32 is received by the inspection notification signal light receiving element 6, and the fire detector can be inspected.

In the above embodiment, the MPU1, ROM1 and ROM6 of the sensor control circuit 20 are an example of the fire detecting means, the external LEDs 4L, 4R are an example of the first test light emitting element, and the sensor control circuit 20. MPU1,
ROM1, ROM4, ROM5 and lighting circuits 23L, 23
R is an example of a first operation test means. Also, the internal LE
D3Lb, 3Lr, 3Rb, and 3Rr are examples of the second test light emitting element, and MPU1 and R of the sensor control circuit 20 are included.
OM1, ROM2, ROM3 and lighting circuits 24L, 24R
Is an example of the second operation test means. Further, the MPU1, ROM1 and ROM4 of the sensor control circuit 20 are an example of the stain degree determining means, and similarly the MPU1, ROM1 and RO.
The M2 and the ROM 3 are an example of the light receiving sensitivity determining means. In addition, the MPU1, ROM1 and ROM of the sensor control circuit 20
5 is an example of the extinction ratio calculation means, and is also MPU1, R
The OM1 and the ROM2 are an example of the light receiving sensitivity calculating means.

Further, MPU1 and R of the sensor control circuit 20
The OM1, POM4 and ROM5 are examples of pollution compensation means, and the MPU1, ROM1, ROM2 and ROM3 are examples of light receiving sensitivity compensation means. In addition, the transmission control circuit 2
1 and the signal transmission / reception unit 22 are examples of contamination or light reception sensitivity limit reporting means, and similarly, the transmission control circuit 21 and the signal transmission / reception unit 22 are examples of contamination or light reception sensitivity status reporting means.

FIG. 8 is a flow chart showing the main routine of the control program for the radiation fire detector of FIG.
9 and 10 are flowcharts showing No. 1 and No. 2 of the reception interrupt program of the radiant fire detector of FIG. FIG. 11 is a flow chart showing a test program for the radiant fire detector of FIG. 12 and 13 are flow charts showing No. 1 and No. 2 of the flame detection program of the radiant fire detector of FIG. 8 to 13 below
The operation of the fire detector of FIGS. 1 and 4 will be described with reference to FIG.

In step S31 of FIG. 8, the fire detector performs an initial process after the power is turned on. As the initial processing, for example, the RAM data included in the sensor control circuit 20 and the transmission control circuit 21 are cleared and R
Sum check of OM data (check of added value of data), storage of initial data for correction of the light receiving element alone in RAM 3 of FIG. 5, clear of timer, counter, etc., time required for stabilizing amplifier (for example, about 0.5 seconds) The operation such as standby of (about) is performed.

In step S32 of FIG. 8, the sensor control circuit 20 in the fire detector uses the I / O interface of FIG. 5 to smooth the output signal of each light receiving sensor into the smoothing circuit 15L.
-18L, 15R-18R are read, the value is quantized, and it stores in RAM4. The I / O interface sequentially selects one signal from the eight input signals output from each of the smoothing circuits by a built-in multiplexer on the basis of a command from the MPU 1 and outputs the selected signal to A / O.
Quantization is performed by the D converter, and the quantized data is sequentially RA
The final fire monitoring data is stored in M4 and the calculation for calculating the average value of the stored plural data is performed.

The sampling frequency of the data passed through the A / D converter is preferably twice the maximum frequency of 12 Hz of flame fluctuation, for example 25 Hz or more, based on the Nyquist sampling theorem. The sampling cycle is preferably 0.04 seconds or less). Further, the calculation of the average value of a plurality of sampled data eliminates the influence of the maximum value and the minimum value of the sample data and has an integral function, so that it is desirable that the number of sample data is as large as possible. However, since the time allowed from flame generation to fire detection is generally restricted, within the range of this time restriction, it is possible to detect the long-wavelength and short-wavelength light receiving sensors for the left and right sensing areas, respectively. A large number of sample data are collected, the average value of the collected data is calculated, and this value is used as fire monitoring data in each wavelength range.

When the output level of the light receiving sensor is high, the signal from the amplifier that has passed through the smoothing circuit becomes the saturation level. The signal level in the area is measured.

In step S33 of FIG. 8, the sensor control circuit 20 determines whether or not the light receiving element alone needs to be corrected. This is the necessity of correction for the photosensitivity of each of the photodiodes 1L, 1R or the pyroelectric elements 2L, 2R that deteriorates over time after use. Therefore, the internal LEDs 3Lb, 3Lr and 3R are set at predetermined intervals.
b, 3Rr are driven to measure the received light output values of the left photodiode 1L and the pyroelectric element 2L and the left photodiode 1R and the pyroelectric element 2R, respectively, and the ratio between the measured value and the reference value at the initial stage of installation is measured. Is calculated as the light receiving sensitivity, and the calculated value is stored in the RAM 3 of FIG.

The calculated value of the light receiving sensitivity has an initial value of 1.00 at the time of installation, and is 0.9, for example, depending on the decrease of the light receiving sensitivity.
5, 0.90, 0.85 and so on. Therefore, FIG.
The MPU 1 reads the calculated light-reception sensitivity value of the corresponding light-reception sensor in the RAM 3 and outputs it in the normal range (for example, 1.00 to 0.8).
5) It is determined whether or not it is within the normal range stored in the ROM 2, and it is determined that the correction is not necessary, and step S
35, the correction value is determined to be necessary when the value is equal to or lower than the lower limit value of the normal range, and in step S34, the correction value (the reciprocal number of the light receiving sensitivity, the reciprocal number in the case of 0.60 immediately) 1 / 0.6) is multiplied to perform the correction calculation. As a result, the fire monitoring data is removed from the influence of the decrease in the light receiving sensitivity. In addition, an allowable range (for example, 1.00 to 0.50) is preset for the light receiving sensitivity and R
When the calculated value of the light receiving sensitivity is stored in the OM3 and becomes equal to or lower than the lower limit value (0.50 in the above example), the correction calculation is not performed and a signal indicating that the correction limit is exceeded is output. Details of this will be described with reference to FIG.

In step S35 of FIG. 8, the sensor control circuit 20 determines whether or not the stain correction of the light receiving glass 7 is necessary. This is because, for example, when a fire detector is installed in a tunnel or the like, the surface of the light-receiving glass 7 becomes dirty with the exhaust gas of the vehicle with the passage of time, and the light transmittance gradually decreases. Therefore, the external LED 4
L and 4R are used to measure the light transmittances of the left and right portions of the light-receiving glass 7, and the extinction ratio data is set to R.
Store in AM2. The dimming rate data also has an initial value of 1.00 at the time of installation and is updated to 0.95, 0.90, 0.85, etc. when the surface of the light receiving glass 7 becomes dirty.

Therefore, the MPU 1 of FIG. 5 reads the corresponding left or right extinction ratio data in the RAM 2, for example
If it is 00, it is determined that the correction is not necessary, and the process proceeds to step S37. If the value is 1.00 or less, it is determined that the correction is necessary, and the average value data in step S32 or step S3.
In step S36, the correction data of 4 is multiplied by a correction value (the reciprocal of the extinction ratio data) to perform a correction calculation. As a result, the average value data or the correction data is free from the influence of stains on the light-receiving glass. The data of the extinction ratio has a lower limit value (for example, 0.
50) is preset and stored in the ROM 4,
When the value is less than or equal to this lower limit value, the correction calculation is not performed and
When the signal indicating that the correction limit has been exceeded is output, or when the pre-set lower limit set to a value slightly higher than the lower limit (for example, 0.6) is reached, a signal indicating that the light-receiving glass needs to be cleaned is output. To output. Details of this will be described with reference to FIG.

Generally, in a two-wavelength radiant fire detector, a light receiving sensor (a photo sensor in this example) that detects a blue light of a flame from a light receiving output of a light receiving sensor (a pyroelectric element in this example) that detects a red light of a flame. The difference value is obtained by subtracting the received light output of the diode), and when the difference value exceeds the threshold value for flame discrimination, it is discriminated as flame. In this embodiment, the MPU 1 executes the step S37 of FIG.
If necessary, subtraction of the photodetection output calculation value of the photodiode from the photodetection output calculation value of the pyroelectric element for each monitoring area, in which the above-mentioned photodetection sensitivity and stain correction calculations have been respectively performed, is calculated. And the next step S3
8, the difference data of the subtraction result is the ROM of FIG.
It is discriminated whether or not the flame discrimination threshold value stored in 6 is exceeded, and flame discrimination is performed.

As the threshold value for flame determination, a single threshold value can detect a flame. However, in this embodiment, when it is determined in step S38 that the detected flame is far or near at the same time, the ROM 6 of FIG.
And the second threshold, which is a slightly larger value, are stored. Naturally, the second threshold is a value larger than the first threshold. And step S3
In step S38, the difference data calculated in step 7 is first compared with the first threshold value, and if it exceeds the first threshold value, it is determined to be a flame. Then, the difference data is compared with a second threshold value, and if it exceeds the second threshold value, it is determined that it is a short-distance flame, and if it does not exceed the second threshold value, it is a long-distance flame. Of course, if the difference data does not exceed the first threshold value, it is determined that it is not a flame.

If the result of the determination in step S38 is not flame, the MPU 1 returns to step S32, and returns to step S32.
The processes of 32 to S38 are repeated. When the determination result is flame, in step S39, the transmission control circuit 21 is notified of the flame detection, the transmission control circuit 21 drives the signal transmitting / receiving unit 22, and the receiver detects the flame through the signal transmission line. Send a signal.

When the receiver receives the flame detection signal from the fire detector, it confirms this detection signal and immediately sends a flame accumulation restoration signal to the fire detector to reset the first flame detection signal and fire detection signal again. Check if the instrument sends the second flame detection signal. When a flame detection signal is transmitted a predetermined number of times (for example, three times) or more continuously from the same fire detector, it is determined that there is a true fire. In this way, false alarms are prevented from occurring.

The reception interrupt routine of the fire detector of FIG. 1 will be described with reference to FIGS. 9 and 10. First, when the receiver selects one of a plurality of fire detectors and issues an operation command to the selected fire detector, information on the address and operation command given in advance for each fire detector Is transmitted via a signal transmission line. 9 and 10 show a routine performed as an interrupt process by the fire detector that receives the address and operation command information transmitted by the receiver.
In the reception interrupt routine of FIG. 9, each fire detector first determines whether or not the received address matches the address given to itself (step S41). If the own address and the received address are different, the process returns from the reception interrupt routine to the main routine.

When the self-address coincides with the reception address, the fire detector first discriminates whether or not the reception command is an information request (step S42), and the discrimination result is YES.
In the case of, the present information of itself is sent to the receiver (step S43). Here, the current information of the fire detector is, for example, whether the flame is currently detected, if detected, how many times the flame is currently detected, or the current light receiving glass 7
Includes a plurality of pieces of information indicating the current state, such as whether the light transmittance is within the allowable range, the light receiving sensitivity of the current light receiving element is within the allowable range, and the like.

If the received command is not an information request, it is then determined whether the received command is a test command (step S4).
4) If the determination result is YES, the fire detector first causes the left and right internal LEDs 3Lb, 3Lr and 3Rb, 3Rr to sequentially emit light, similarly to the process of step S33 of FIG. Photodiode 1L and pyroelectric element 2L and right photodiode 1R and pyroelectric element 2R
Measure the light receiving sensitivity of each. If the measured photosensitivity is less than or equal to the set threshold value (for example, 50% of the reference value), the sensitivity defect is stored, and the test is repeated a plurality of times to continuously determine the number of the sensitivity defects. When the number of times reaches the number of times (for example, three times) or more, it is determined that the photodetector tested for the first time has a failure, and a failure signal of the corresponding photodetector is transmitted to the receiver.

Next, the fire detector operates in step S35 of FIG.
In the same manner as the processing of step 1, the external LEDs 4L and 4R are sequentially made to emit light, the transmittance of light indicating the degree of stain of the light-receiving glass 7 is measured, and the measured transmittance of light is set to a preset threshold value (for example, If it is 50% or less of the reference value, this stain failure is stored, and this test is repeated a plurality of times in the same manner as described above, and the number of stain failures is continuously a predetermined number (for example, 3).
When the number of times above is reached, the receiver is notified that cleaning of the light-receiving glass requires cleaning. After the test process is completed, the process returns to the main routine.

If the reception command is not a test command, it is then determined whether it is an inspection start command (step S46). If the determination result is YES, it is further determined whether it is the right side only, the left side only, or both the left and right sides ( Step S47), based on this determination result, the pseudo flame light source of the inspection tester shown in FIG. 6 is used to inspect the right side light receiving element (step S48), the left side light receiving element is inspected (step S50), or right side and left side Element inspection processing (steps S49 and S50) is performed. Before describing the processing contents of steps S46 to S50, first, the necessity of the inspection start command and the inspection notification signal will be described. FIG. 14 is a diagram showing a plurality of fire detectors installed in a tunnel and a receiver connected via a signal transmission line. As shown in FIG. 14, generally, in a tunnel, a plurality of or a large number of fire detectors are installed so that the respective fire detection areas are slightly overlapped.
Often connected to the receiver via a common signal transmission line.

In FIG. 14, T1 to Tn are fire detectors # 1 to #n, respectively, and it is assumed that 64 fire detectors # 1 to # 64 are currently installed. When maintenance personnel perform inspection tests using the tester, they are not necessarily performed in the order of numbers, and the addresses of fire detectors are not always provided in order due to replacement of devices that occur during use. . Therefore, on the receiver side that receives the flame detection signal from the inspection test, it is necessary to know which fire detector is currently being tested. I was informed about what number of fire detectors I would like to test from now on.

In this embodiment, the fire detector determines whether it is the inspection start command (step S4).
6), the sensor control circuit 20 supplies power to the amplifier 19 and sets it in an operable state. Further, in addition to the pseudo flame light source, the tester is provided with a light emitting element 32 which is a means for generating an inspection notification signal (an optical signal of about 500 Hz in this example).
The optical signal of about 500 Hz is emitted as a signal notifying that the inspection test is currently being performed by the tester.

Then, when the fire detector under inspection test detects the optical signal of about 500 Hz through the inspection notification signal light receiving element 6 and the amplifier 19, this detection signal together with its own address number is received by the receiver or the repeater. And so on. Therefore, it is unnecessary to communicate with a transceiver or the like, which is conventionally required. Further, since the tester irradiates the fire detector with the optical signal from the pseudo flame light source, if the contamination of the light-receiving glass 7 and the sensitivity of the light-receiving element are within the permissible range and the device is operating normally,
The fire detection signal and the in-inspection signal are transmitted from the corresponding fire detector to the receiver.

Therefore, by simultaneously receiving the flame detection signal and the in-inspection signal, the receiver side knows that the fire detector during the inspection test is operating normally, and if other fire detectors are in operation. When only the flame detection signal is received from, it can be known that the corresponding fire detector has detected the actual flame. In this way, the inspection test can be performed while maintaining the flame detection function of all the other fire detectors except the fire detector during the inspection test. When the inspection test process is completed, the fire detector returns to the main routine.

When it is determined in step S46 in FIG. 9 that the inspection start command is not received, the MPU 1 in the sensor control circuit 20 determines that the operation command received in step S51 in FIG. , The operation / fire indicator lamps 5L and 5R include a green LED of the two-color LEDs) for turning on or off, and if the determination result is YES, in step S52,
Whether it is the right operation light or the left operation light is discriminated. In the case of the right side, step S53, and in the case of the left side, step S54.
Then, the operation of turning on or off the operation indicator lamp (flashing) or extinguishing the blinking state is performed. When the lighting or extinguishing operation is completed, the process returns to the main routine.

When it is determined in step S51 in FIG. 10 that the operation indicator lamp is not the lighting or extinguishing instruction, the MPU 1 in the sensor control circuit 20 determines in step S55 that the received operation instruction is the fire indicator lamp (this operation In the example, it is determined whether it is a lighting or extinguishing command for the red LED of the two-color LEDs), and if the determination result is YES, in step S56, the right fire indicator light or the left fire indicator light If it is on the right, step S5
7 or in the case of the left side, in step S58, the operation of turning on the fire indicator light continuously or turning off the continuous lighting state is performed. When the lighting or extinguishing operation is completed, the process returns to the main routine.

When it is determined in step S55 in FIG. 10 that the command is not for turning on or off the fire indicator lamp, the MPU 1 in the sensor control circuit 20 determines whether the operation command received in step S59 is a storage recovery command. To determine. Here, the storage restoration command means that when the fire detector first detects a flame and sends this detection signal to the receiver, the receiver that receives this detection signal waits for a while and To reset the fire monitoring data that has been collected and accumulated and collect new data again.
This is a reset command to test whether or not the second flame detection is performed, that is, to prevent the occurrence of a false alarm. If the decision result in the step S59 is YES, it is decided whether it is the right side or the left side (step S60), and if the right side, the step S61, and if the left side, the step S61.
At 62, the above-mentioned storage recovery operation is performed, and then the process returns to the main routine.

In step S59 of FIG. 10, when it is determined that the storage recovery command is not received, the sensor control circuit 20
In step S63, the MPU 1 therein determines whether it is a restoration command. If the determination result is YES, all the data are reset in step S64, and if NO, the process immediately returns to the main routine. Here, resetting all data means resetting the fire monitoring data collected up to that point as well as resetting (that is, turning off) the lighting data of the operation indicator light and the fire indicator light, and turning on the fire detector after the power is turned on. It is to restore to the initial state. After the completion of this restoration process, the process returns to the main routine.

The test operation of the fire detector of FIG. 1 will be described with reference to the flowchart of FIG. In this embodiment, FIG.
The test routine of (1) is started when the power of the fire detector is turned on, a test command from the receiver, or a timer interrupt process. However, in any case, the switch or the like may be used to select whether to start the test routine. In step S71 in FIG. 11, the sensor control circuit 20 determines whether the left or right internal pseudo light source (internal LE
D) Flush 3Lb, 3Lr or 3Rb, 3Rr by flashing. In this case, the pseudo light is made to flash in a flame fluctuation frequency band of about 8 to 12 Hz.

Then, the sensor control circuit 20 makes the photodiode 1L and the pyroelectric element 2L, which are light receiving elements, or the photodiode 1 in a state where the internal pseudo light source is made to emit light.
Each received light data based on the detection signal of R and the pyroelectric element 2L,
The data is sequentially read through the multiplexer and the A / D converter in the I / O interface, and the read data is sequentially stored in the RAM 4. Then, the received light data that has been read in as much as possible is averaged within the time allowed for fire detection, and the averaged data is stored in the RAM 4 as received light output data (step S
72). After the collection of the received light data, the sensor control circuit 20 turns off the internal pseudo light source (step S73),
The ratio of the averaged light receiving data and the light receiving sensitivity reference value stored in advance in the ROM 2 is calculated as the light receiving sensitivity of the corresponding light receiving element, and the calculated value of the light receiving sensitivity is set in advance and stored in the ROM 2. Whether or not the received light data is normal is determined by whether or not the received light sensitivity is within the normal range (for example, 1.00 to 0.85) (step S74).

If the result of the determination in step S74 is normal, it is determined that the correction is unnecessary and the process proceeds to step S78. If not, the process proceeds to step S75. In step S75, whether or not the calculated value of the light receiving sensitivity is not within the normal range but is still within the correctable range is determined as follows. In this embodiment, the permissible range of the light receiving sensitivity is set in advance as 1.00 to 0.50 and stored in the ROM 3. The calculated value of the light receiving sensitivity is the lower limit value of the allowable range (0.
50) Whether or not the received light data can be corrected is determined depending on whether or not the above is satisfied.

Further, in this embodiment, a value (for example, 0.60) slightly higher than the lower limit value (0.50) of the permissible range of the light receiving sensitivity is set in advance as the lower limit value, At the step S75, it is also determined at the same time whether the calculated value of the light receiving sensitivity is less than or equal to the front lower limit value.

When it is determined in step S75 that the correction is possible, the sensor control circuit 20 multiplies the received light data by the reciprocal of the calculated received light sensitivity and performs a sensitivity deterioration correction calculation to obtain the received light sensitivity. The value of is stored in the RAM 3 (step S76). Then, the process proceeds to step S78. Then, in step S75, if the light-reception sensitivity calculated value is equal to or lower than the lower limit value of the allowable range (0.50 in the above example) and it is determined that the sensitivity correction exceeds the limit and is impossible, the fire detector proceeds to step S75. In S77, the sensitivity abnormality signal of the corresponding light receiving element is transmitted to the receiver. Further, in step S75, a comparison determination is performed with the front lower limit value (0.60 in the above example), and when the light reception sensitivity calculated value is equal to or lower than the front lower limit value,
Similarly, in step S77, the receiver is notified of a notice signal of reception sensitivity deterioration (a signal indicating that it is just before sensitivity deterioration and requires preparation for repair such as arrangement of parts).

The receiver which has received the abnormal signal of the light receiving element from the fire detector repeats the sensitivity test of the same light receiving element of the fire detector, and repeats the same test for a predetermined number of times (for example, 3).
If more than one abnormal signal is returned, the corresponding light receiving element is determined to have failed, and a repair instruction is issued immediately. Also, when the receiver receives the advance notice signal of the deterioration of the light-receiving sensitivity, the operator repeats the confirmation by repeating the operation and prepares for repair after confirmation. The above test is conducted separately from the left test and the right test.

In step S78 of FIG. 11, the sensor control circuit 20 flashes the left or right external pseudo light source (external LED) 4L or 4R for the stain test of the light-receiving glass 7. In this case, the light source is made to flush at a frequency range of about 8 to 12 Hz, which is a fluctuation frequency band of a flame at the time of fire.

Then, the sensor control circuit 20 receives the light-receiving data based on the detection signal of the photodiode 1L or 1R, which is a light-receiving element, while the external pseudo light source is emitting light, and outputs the light-receiving data to the multiplexer and A in the I / O interface, respectively. The data is sequentially read via the / D converter, and the read data is sequentially stored in the RAM 4. Then, the received light data that has been read in as much as possible is averaged within the allowable range of time, and the averaged data is stored in the RAM 4 as received light output data (step S79). In the case of the stain test of the light-receiving glass 7, one light-receiving element is sufficient, and therefore, the light-receiving data of the pyroelectric element is not used in this embodiment.

After the end of the data collection, the sensor control circuit 20 turns off the external pseudo light source (step S80), and calculates the extinction rate for each of the left side and the right side of the light receiving glass 7 (step S81). The extinction ratio is calculated as a ratio between the averaged received light data and the extinction ratio reference value stored in advance in the ROM 5. In this example,
The allowable range of the extinction ratio is set in advance as 1.00 to 0.50 and stored in the ROM 4. Then, it is determined whether or not the received light data can be corrected depending on whether or not the calculated value of the extinction ratio is equal to or more than the lower limit value (0.50 in the above example) of the allowable range (step S8).
2).

Further, in this embodiment, a value (for example, 0.60) slightly higher than the lower limit value (0.50) of the permissible range of the extinction ratio is preset as the front lower limit value. At the same time, in step S82, it is determined whether or not the calculated value of the extinction ratio is less than or equal to the front lower limit value.

When it is determined in step S82 that the correction is possible, the sensor control circuit 20 multiplies the received light data by the reciprocal of the calculated extinction ratio to perform a stain correction correction operation. The value of the rate is stored in the RAM 2 (step S83). Then, in step S82, when the calculated extinction ratio value is equal to or lower than the lower limit value (0.50 in the above example) of the allowable range and it is determined that the stain correction exceeds the limit and is impossible, the fire detector determines that In step S84, the stain abnormality signal on the left side or the right side of the light receiving glass 7 is transmitted to the receiver. Further, in step S82, a comparison determination with the front lower limit value (0.60 in the above example) is performed, and when the calculated extinction ratio is equal to or less than the front lower limit value, in step S84, similarly. A notice signal of the stain abnormality (a signal indicating that the stain-absorbing glass 7 needs to be cleaned in the corresponding light-receiving direction immediately before the stain abnormality) is sent to the receiver.

When the receiver receives the stain abnormality signal from the fire detector, the receiver repeats the stain test on the light-receiving glass of the fire detector, and the abnormality signal is returned a predetermined number of times consecutively (for example, 3 times) or more. In this case, the relevant light-receiving glass is judged to have been contaminated and the cleaning instruction is given immediately. Also, when the receiver receives the advance notice signal of the stain abnormality, the operator repeats the confirmation by repeating the operation and issues a cleaning preparation instruction after confirmation. The above test is conducted separately for the left side test and the right side test.

The flame detecting operation of the fire detector of FIG. 1 will be described with reference to the flowcharts of FIGS. The flame detection operation based on this flowchart is commonly used in the case of an actually generated flame and in the case of a pseudo flame signal generated from an inspection tester. This will be described in more detail.
In step S91 of FIG. 12, the fire detector performs initial processing. This initial process is step S in FIG.
The processing is the same as that of 31, such as clearing the RAM data, checking the ROM data sum, storing the initial data for correction of the light receiving element alone, clearing the counter, and waiting for the stabilization time of the amplifier.

Then, it is determined whether the received data matches the address of its own fire detector (step S92),
If they match, the process proceeds to step S101, and if they do not match, the received light output data is read (step S93). Then, the process of obtaining the averaged data of the received light output data read as much as possible within the time allowable range is the same as the process described in step S72 of FIG.

In step S94 of FIG. 12, the sensor control circuit 20 compares the difference data of the two received light outputs with the fire discrimination threshold value, as in the process of step S38 of FIG. It is determined whether or not it is detected. At this time, the received light output is determined after being corrected similarly to the processing of steps S33 to S37 of FIG. Step S
If the flame is not detected in the determination of 94, the sensor control circuit 20 sets the value f of the counter provided in the RAM 6 for counting the number of times of flame detection to 0 and clears the count value of the counter (step S95). ). That is, when the flame detection signal is continuously input, this counter sequentially counts up, but if flame detection is not performed during counting, the count value up to that point is reset to zero. After that, the process returns to step S92.

When the flame is detected by the determination in step S94, the sensor control circuit 20 adds 1 to the count value f of the counter up to then (step S96).
It is determined whether the value of the counter f is equal to or larger than a preset number F (for example, 3) (step S97). As a result of this determination, when the value f of the counter is less than the set number F, the process returns to step S92 and the addition of the number of flame detections is repeated.

As a result of the determination in step S97, when the number of times flame detection is continuously performed (the value f of the counter) reaches or exceeds the set number F, the inspection flag is turned on next. It is determined whether or not (step S98), whether a pseudo flame signal is detected (inspection flag is on) or a flame signal due to fire occurrence is detected (inspection flag is off). Then, in the case of detecting the pseudo flame signal, both the flame signal and the inspection signal are set as the transmission information (step S9).
9) If the fire flame signal is detected, only the flame signal is set as the transmission information (step S100), and the process returns to step S92.

The sensor control circuit 20 proceeds to step S101.
Then, it is determined whether the received data is an information request command, and in the case of the information request command, the information preset in the fire detector, for example, the flame detection information set in steps S99 and S100 is sent out. (Step S10
2) Then, the information that has been sent is cleared (step S103). When sending the information set in step S102, the self address may be added and sent. When it is determined in step S101 that the received data is not the information request command, the sensor control circuit 20 determines whether the received data is an inspection start permission signal (step S104). If the determination result is YES, When the power of the amplifier 19 of FIG. 1 which is the inspection notification signal light receiving circuit is turned on and the inspection tester irradiates its own fire detector with the optical signal of about 500 Hz which is the inspection notification signal, this irradiation is performed. The light is set to a detectable state (step S105).

When a maintenance worker operates the inspection tester by bringing the inspection tester close to the light receiving glass 7 of the fire detector to be inspected, the optical signal of about 500 Hz emitted from the tester causes the inspection notification signal light receiving element 6 and the amplifier. It is detected via 19 and supplied to the sensor control circuit 20. Upon being supplied with the inspection notification signal, the sensor control circuit 20 immediately activates the inspection notification signal reception interrupt routine shown in the upper right part of FIG. 13, and first, its own fire detector is under inspection test by the tester. So that the receiver can be notified, an inspection notification signal is set as transmission information (step S111), the inspection flag is turned on (step S112), and step S9
Return to 2.

If it is determined in step S104 that it is not the inspection start permission signal, the sensor control circuit 20 determines that
In step S106 of 3, it is determined whether the received data is an inspection end signal to the fire detector of its own. If the result of the determination is YES, the inspection signal light receiving circuit (the amplifier 1 in FIG.
The power of 9) is turned off (step S107). When it is determined in step S106 that the signal is not the inspection end signal, the sensor control circuit 20 determines in step S108 of FIG.
Then, it is determined whether or not the received data is a restoration signal to the fire detector of its own, and if the determination result is YES, as shown in FIG.
The same process as the recovery process described in step S36 is performed, and the process returns to step S92. If the determination result is not the restoration signal, the process directly returns to step S92.

The radiant fire detector in the above embodiment is
An example of the case of the two-wavelength type in which the magnitude relationship of the radiant energy detected in the two wavelength bands of the radiant light from the flame is compared has been shown, but the present invention is not limited to this and, for example, a single wavelength is used. Even with the constant radiation type that detects the amount of radiant energy in the band, the flicker type that detects flicker peculiar to flames, and the type that uses three or more wavelengths, a light receiving element is placed inside the translucent cover. It can be applied to all the radiant fire detectors provided and can achieve the same effect.

The radiation type fire detector in the above embodiment is
Although an example in which there are two sensing areas on the front left side and the right side with respect to the installation surface is shown, the present invention is not limited to this, and for example, all three-dimensional space in front is a single sensing area. In some cases, even if it is provided in the center of the plaza and has four sensing areas on the front left and right sides and the rear left and right sides, that is, in the case of a radiant fire detector having one or more sensing areas. Also, it is possible to obtain the same effect by applying the present invention.

[0089]

As described above, according to the present invention, a translucent cover for transmitting radiant light emitted from a flame, and a transmitted light from the translucent cover provided inside the translucent cover. A radiation-type fire detector having a light-receiving element for receiving light and a means for detecting a fire based on a detection signal of the light-receiving element, wherein light is emitted from a first test light-emitting element provided outside the translucent cover. It becomes possible to perform a first operation test of irradiating the light-receiving element through the light-transmitting cover by the generated first pseudo flame signal, and at the same time, the light-receiving element is irradiated during the first operation test. Calculating the extinction ratio of the translucent cover from the detection signal level of, when the extinction ratio calculated value is equal to or more than the lower limit value of the allowable range, depending on the calculated value of the extinction ratio, Change the amplification degree of the amplifier that amplifies the output, or Since the threshold value for detecting a fire is changed so as to automatically compensate for the contamination of the translucent cover, it is possible to self-check for malfunctions due to the contamination of the translucent cover, and to prevent the conventional translucent cover from operating. It has become possible to significantly reduce the number of man-hours required for cleaning the light cover and manually compensating for stains.

Further, according to the present invention, the light receiving element is irradiated with the second pseudo flame signal emitted from the second test light emitting element provided inside the translucent cover of the radiant fire detector. It becomes possible to carry out the second operation test, and at the time of the test of the second operation test means, the light receiving sensitivity of the light receiving element is calculated from the detection signal level of the light receiving element, and the light receiving sensitivity calculated value is If it is equal to or higher than the lower limit of the allowable range, the amplification factor of the amplifier for amplifying the output of the light receiving element is changed or the threshold value for detecting a fire is changed according to the calculated value of the light receiving sensitivity. Since the deterioration of the light receiving sensitivity is automatically compensated for, it is possible to self-check for malfunctions due to the deterioration of the light receiving sensitivity of the light receiving element, and the man-hours required for manually compensating the sensitivity deterioration of the conventional light receiving element are significantly increased. To It can now be reduced.

Further, according to the present invention, when the extinction rate calculated value or the light reception sensitivity calculated value of the radiation type fire detector reaches the lower limit value of the allowable range or becomes less than the lower limit value, the limit reporting means The maintenance personnel sends a signal to the outside that the automatic compensation for the contamination of the translucent cover or the automatic compensation for the deterioration of the sensitivity of the light receiving element has reached the limit or has exceeded the limit. It has become possible to automatically know when the optical cover needs to be cleaned or when the light receiving element needs to be replaced.

Further, according to the present invention, a translucent cover for transmitting the radiant light emitted from the flame, and a light receiving element provided inside the translucent cover for receiving the transmitted light from the translucent cover. And a means for detecting a fire on the basis of a detection signal of the light receiving element, wherein the first fire light emitting element emits light from the first test light emitting element provided outside the translucent cover. It becomes possible to perform a first operation test as to whether or not the means for detecting the fire operates normally by irradiating the light receiving element through the transparent cover by a pseudo flame signal. Whether or not the means for detecting the fire by irradiating the light receiving element with the second pseudo flame signal emitted from the second test light emitting element provided inside the translucent cover is operating normally or not. It is also possible to perform the second operation test of Further, during the first operation test, the extinction ratio of the translucent cover is calculated from the detection signal level of the light receiving element, and the transmissivity is determined by whether or not the calculated extinction ratio is within the allowable range. A signal indicating that the contamination of the optical cover is automatically compensated or a limit of the contamination compensation is exceeded is notified to the outside, and the light receiving sensitivity of the light receiving element is detected from the detection signal level of the light receiving element during the second operation test. Then, depending on whether or not the calculated value of the photosensitivity is within the allowable range, the photosensitivity of the photodetector is automatically compensated, or a signal indicating that the sensitivity compensation limit has been exceeded is sent to the outside. Therefore, the conventional manual compensation for the contamination of the transparent cover and the deterioration of the sensitivity of the light receiving element is unnecessary, and the maintenance work is greatly reduced. Is it due to the soiling of the protective cover? It has become possible to clearly know whether those due to the failure of a light reception circuit including a light receiving element.

According to the present invention, the determination of the degree of contamination of the translucent cover of the radiation type fire detector and the determination of the degree of deterioration of the light-receiving sensitivity of the light-receiving element are performed by determining the lower limit value and the lower limit value of the allowable range, respectively. Since it is performed in two steps using the front lower limit value set slightly above the value, it is possible to receive a warning signal before the automatic compensation of the stain or the automatic compensation of the sensitivity deterioration reaches the limit. As a result, we have more time to prepare for cleaning and repair parts.

Further, according to the present invention, a plurality of sensing areas are set in advance as substantially independent three-dimensional spaces, and the radiant light emitted from the flame in each of the plurality of sensing areas set is set to the above-mentioned A light-transmitting cover for transmitting each direction of the sensing region, and a plurality of light-receiving elements provided inside the light-transmitting cover and receiving the transmitted light of each direction of the light-transmitting cover for each sensing region. And a radiation-type fire detector having means for detecting a fire in each of the plurality of sensing areas based on a detection signal of each of the plurality of light receiving elements, wherein the translucency is provided in each of the plurality of sensing areas. A first pseudo flame signal emitted from each of a plurality of first test light-emitting elements provided outside the cover transmits the light-transmitting cover to separate the light-receiving elements for each of the plurality of sensing regions. To Shines, the means for sensing the fire has become possible to perform the first operation test of whether to operate normally, respectively for each of the plurality of the sensing area,
For each of the plurality of sensing areas, the second pseudo-flame signal emitted from each of the plurality of second test light-emitting elements provided inside the translucent cover causes the plurality of sensing areas to be detected. It is also possible to irradiate the light receiving elements separately and perform a second operation test as to whether or not the means for detecting a fire normally operates in each of the plurality of sensing areas.
Further, at the time of the first operation test, the extinction rate of the transmissive cover is calculated from the detection signal level of the light receiving element for each of the plurality of sensing areas, and the extinction rate calculation value is within an allowable range. Depending on whether or not there is a stain, the stain of the translucent cover in the direction of each of the sensing areas is automatically compensated, or a signal indicating that the limit of the stain compensation of each sensing area is exceeded is sent to the outside, and the second In the operation test, the light receiving sensitivity of the light receiving element is calculated from the detection signal level of the light receiving element for each of the plurality of sensing regions, and the plurality of light receiving Since the light receiving sensitivity of the light receiving element is automatically compensated for each sensing area or a signal indicating that the limit of sensitivity compensation for each sensing area is exceeded is sent to the outside, there is a conventional fire detector with multiple fire detectors. The sensing area that was sensing Since a single fire detector is sufficient for the equipment, the equipment cost is low, and maintenance work is also reduced by eliminating the need for manual compensation for the contamination of the translucent cover and the deterioration of the sensitivity of the light receiving element for each detection area. It has become possible to know the time when the malfunction occurs and the cause of the malfunction for each area.

Further, according to the present invention, it is possible to determine the degree of contamination of the translucent cover and the degree of deterioration of the light receiving sensitivity of the light receiving element for each of the sensing areas of the radiant fire detector having the plurality of sensing areas. Since the lower limit of the permissible range and the front lower limit set a little higher than the lower limit are used in two steps, the contamination of the plurality of sensitivity regions is automatically detected. It is now possible to receive advance notice signals when the compensation or automatic compensation for sensitivity deterioration reaches its limit, and it becomes possible to have time to prepare for cleaning and prepare repair parts.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a radiation fire detector showing an embodiment of the present invention.

2 is a configuration diagram of the radiant fire detector of FIG. 1. FIG.

FIG. 3 is a diagram showing left and right sensing areas of the radiant fire detector of FIG.

FIG. 4 is a diagram showing a positional relationship between the light receiving element of FIG. 2 and an internal LED.

5 is a configuration block diagram showing an example of the sensor control circuit of FIG. 1. FIG.

FIG. 6 is an external view of a tester for inspecting a fire detector.

FIG. 7 is a diagram showing a positional relationship between a fire sensor and an inspection tester at the time of inspection.

FIG. 8 is a flowchart showing a main routine of a control program for the radiant fire detector of FIG.

9 is a flowchart showing a first part of a reception interrupt program of the radiant fire detector of FIG. 1. FIG.

10 is a flowchart showing a second part of the reception interrupt program of the radiant fire detector of FIG. 1. FIG.

11 is a flowchart showing a test program for the radiation fire detector of FIG. 1. FIG.

FIG. 12 is a flowchart showing a first part of the flame detection program for the radiant fire detector of FIG. 1.

FIG. 13 is a flowchart showing a second part of the flame detection program for the radiant fire detector of FIG. 1.

FIG. 14 is a diagram showing a plurality of fire detectors installed in a tunnel and a receiver connected via a signal transmission line.

[Explanation of symbols]

 1L, 1R left side, right side photodiode 2L, 2R left side, right side pyroelectric element 3Lb, 3Lr left side inside LED 3Rb, 3Rr right side inside LED 4L, 4R left side, right side outside LED 5L, 5R left side, right side operation / fire indicator light 6 inspection Notification signal light receiving element 7 light receiving glass 8L, 8R left side, right side transparent glass 9A case A 9B case B 11L, 12L left side preamplifier 11R, 12R right side preamplifier 13L, 14L left side amplifier 13R, 14R right side amplifier 15L-18L left side smoothing circuit 15R-18R Right side smoothing circuit 19 Amplifier 20 Sensor control circuit 21 Transmission control circuit 22 Signal transmitting / receiving section 23L, 24L Left side lighting circuit 23R, 24R Right side lighting circuit 25L, 25R Left side, right side lighting control circuit 26, 27 Clock circuit 28, 29 Reset circuit

Claims (7)

[Claims] 1. A light-transmitting cover that transmits radiant light emitted from a flame, a light-receiving element that is provided inside the light-transmitting cover and receives light transmitted from the light-transmitting cover, and the light-receiving element. In the radiation-type fire detector having means for detecting a fire based on the detection signal of, a first pseudo-flame signal is emitted by the driving of the first operation test means, which is provided outside the translucent cover. A first test light-emitting element that transmits the light-transmitting cover and irradiates the light-receiving element, and a light-emitting element that drives the first test light-emitting element to emit a first pseudo-flame signal. At the time of a test of the first operation test means for irradiating and the first operation test means, the detection signal level of the light receiving element is measured, and the extinction rate of the translucent cover is calculated based on the measured value. Extinction rate calculation means and the calculated value of the extinction rate A stain degree determining means for determining whether or not it is equal to or more than the lower limit value of the allowable extinction ratio range set for
When the determination result of the contamination degree determining means is affirmative, the amplification factor of the amplifier for amplifying the output of the light receiving element is changed or the threshold value for detecting a fire is determined according to the calculated value of the extinction ratio. And a stain compensating means for compensating the stain of the translucent cover, and an automatic stain compensating means. 2. A transmissive cover which transmits radiant light emitted from a flame, a light receiving element which is provided inside the light transmissive cover and receives light transmitted from the light transmissive cover, and a light receiving element of the light receiving element. A radiant fire detector having a means for detecting a fire based on a detection signal, which is provided inside the translucent cover, emits a second pseudo flame signal by driving a second operation test means, and directly Alternatively, a second test light-emitting element that indirectly irradiates the light-receiving element, and a second test light-emitting element that drives the second test light-emitting element to emit a second pseudo flame signal to irradiate the light-receiving element An operation test unit, a light-reception sensitivity calculation unit that measures a detection signal level of the light-receiving element during the test of the second operation test unit, and calculates the light-reception sensitivity of the light-receiving element based on the measured value; Calculated sensitivity value is preset The light receiving sensitivity determining means for determining whether or not the received light receiving sensitivity is less than or equal to the lower limit of the allowable light receiving sensitivity range, and when the determination result of the light receiving sensitivity determining means is affirmative, the light receiving sensitivity is determined according to the calculated value of the light receiving sensitivity. An automatic compensating means for the photosensitivity, including a photosensitivity compensating means for compensating for the deterioration of the photosensitivity by changing the amplification factor of an amplifier for amplifying the output of the element or by changing the threshold value for detecting fire. A radiant fire detector characterized by being equipped with. 3. The radiant fire detector according to claim 1 or 2, wherein the translucent cover is used when compensation by the automatic compensating means for the stain or light receiving sensitivity reaches or exceeds a limit. 2. A radiant fire detector, comprising: a limit reporting means for reporting a signal indicating that the stain compensation or the light receiving sensitivity compensation of the light receiving element has reached a limit or a signal indicating that the limit has been exceeded to the outside. 4. A light-transmitting cover that transmits radiant light emitted from a flame, a light-receiving element that is provided inside the light-transmitting cover and receives light transmitted from the light-transmitting cover, and the light-receiving element. In the radiation-type fire detector having means for detecting a fire based on the detection signal of, a first pseudo-flame signal is emitted by the driving of the first operation test means, which is provided outside the translucent cover. A first test light-emitting element that transmits the light-transmitting cover and illuminates the light-receiving element; and a first pseudo-light-emitting element that drives the first test light-emitting element to emit a first pseudo-flame signal. A first operation test means for irradiating and testing whether or not the fire sensing means operates normally based on the detection signal of the light receiving element; and a second operation test means provided inside the translucent cover, A second pseudo flame signal is emitted by driving the operation test means, A second test light emitting element that directly or indirectly irradiates the light receiving element; and a second pseudo light emitting element that drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element. Second operation test means for testing whether or not the fire sensing means operates normally based on the detection signal of the light receiving element, and the detection signal level of the light receiving element during the test of the first operation testing means. And a light extinction ratio calculating means for calculating the light extinction ratio of the translucent cover based on the measured value, and the calculated value of the light extinction ratio is a lower limit value of a preset light extinction ratio allowable range. If the determination result of the contamination degree determination means for determining whether or not the above, and the determination result of the contamination degree determination means is affirmative, according to the calculated value of the extinction ratio, an amplifier for amplifying the output of the light receiving element Change the amplification level or change the threshold for fire detection. Then, the pollution compensation means for compensating for the contamination of the translucent cover and the contamination limit for notifying the outside that a signal indicating that the contamination compensation limit has been exceeded when the determination result of the contamination degree determination means is negative. An automatic pollution compensation and limit reporting means including a reporting means, and a detection signal level of the light receiving element during the test of the second operation testing means, and a light receiving sensitivity of the light receiving element based on the measured value. Light receiving sensitivity calculating means for calculating, light receiving sensitivity determining means for determining whether or not the calculated value of the light receiving sensitivity is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range, and a determination result of the light receiving sensitivity determining means Is affirmative,
According to the calculated value of the light receiving sensitivity, the light receiving sensitivity for compensating for the deterioration of the light receiving sensitivity by changing the amplification degree of the amplifier for amplifying the output of the light receiving element or changing the threshold value for detecting a fire. Automatic compensation and limit of light receiving sensitivity including compensating means and light receiving sensitivity limit notifying means for notifying a signal to the outside that the limit of the light receiving sensitivity compensation is exceeded when the determination result of the light receiving sensitivity determining means is negative. A radiant fire detector characterized by comprising a reporting means. 5. A light-transmitting cover that transmits radiant light emitted from a flame, a light-receiving element that is provided inside the light-transmitting cover and receives light transmitted from the light-transmitting cover, and the light-receiving element. In the radiation-type fire detector having a means for detecting a fire based on the detection signal of, a first pseudo-flame signal is emitted by the driving of the first operation test means, which is provided outside the translucent cover. A first test light-emitting element that transmits the light-transmitting cover and illuminates the light-receiving element; and a first pseudo-light-emitting element that drives the first test light-emitting element to emit a first pseudo-flame signal. A first operation test means for irradiating and testing whether or not the fire sensing means operates normally based on the detection signal of the light receiving element; and a second operation test means provided inside the translucent cover, A second pseudo flame signal is emitted by driving the operation test means, A second test light emitting element that directly or indirectly irradiates the light receiving element; and a second pseudo light emitting element that drives the second test light emitting element to emit a second pseudo flame signal to irradiate the light receiving element. Second operation test means for testing whether or not the fire sensing means operates normally based on the detection signal of the light receiving element; and the detection signal of the light receiving element during the test of the first operation testing means. A light extinction ratio calculating unit that measures the level and calculates the light extinction ratio of the translucent cover based on the measured value, and the calculated value of the light extinction ratio is the maximum of the preset light extinction ratio allowable range. First and second contamination degree determinations for determining whether or not the value is equal to or more than a lower limit value and determining whether or not the value is equal to or more than a preset lower limit value that is set to a value slightly higher than the lowest limit value. And the determination result of the first contamination degree determination means is affirmative According to the calculated value of the extinction ratio, the amplification degree of the amplifier that amplifies the output of the light receiving element is changed, or the threshold value for detecting a fire is changed to prevent contamination of the translucent cover. When the determination result of the stain compensation means for compensation and the second stain degree determination means is negative, a signal to the effect that cleaning of the translucent cover is required is sent to the outside,
In addition, when the determination result of the first contamination degree determination means is negative, there is provided a pollution status reporting means for externally reporting a signal to the effect that the limit of the pollution compensation has been exceeded, and automatic pollution compensation and status reporting means. A light receiving sensitivity calculating means for measuring the detection signal level of the light receiving element and calculating the light receiving sensitivity of the light receiving element based on the measured value during the test of the second operation testing means; and a calculated value of the light receiving sensitivity Is above a lower limit value of a preset light receiving sensitivity allowable range and is above a lower limit value which is preset to a value slightly above the lower limit value. When the determination results of the first and second light receiving sensitivity determining means and the first light receiving sensitivity determining means are respectively affirmative, according to the calculated value of the light receiving sensitivity,
By changing the amplification degree of the amplifier for amplifying the output of the light receiving element, or by changing the threshold value for detecting a fire,
When the determination result of the light receiving sensitivity compensating means for compensating the deterioration of the light receiving sensitivity and the second light receiving sensitivity determining means is negative,
An advance signal of deterioration of light receiving sensitivity is sent to the outside, and the first
When the determination result of the light-receiving sensitivity determining means is negative, the light-receiving sensitivity automatic compensation and status reporting means including a light-receiving sensitivity status reporting means for reporting to the outside a signal indicating that the limit of the light-receiving sensitivity compensation is exceeded. A radiant fire detector characterized by being equipped. 6. A plurality of sensing areas are set in advance as a substantially independent three-dimensional space, and the radiant light emitted from the flame in each of the plurality of sensing areas set is divided by the direction of each sensing area. A light-transmitting cover that transmits the light, a plurality of light-receiving elements that are provided inside the light-transmitting cover, and that receive the light transmitted by the direction of the light-transmitting cover for each sensing region, and the plurality of light-receiving elements. A radiation fire detector having means for detecting a fire in each of the plurality of sensing areas based on a detection signal of each light receiving element, wherein each of the plurality of sensing areas is provided outside the translucent cover. The first operation test means drives each of the sensing areas to emit a first pseudo-flame signal, which is transmitted through the light-transmitting cover to irradiate the light-receiving element of each of the sensing areas. A first test light emitting element having, first and the plurality of first test light emitting element is driven individually 1
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. First operation test means for testing whether or not each of the plurality of sensing areas operates, and each of the plurality of sensing areas is provided inside the light-transmitting cover, and each of the sensing areas is detected by the second operation testing means. A plurality of second test light-emitting elements that emit second pseudo-flame signals when driven, and directly or indirectly irradiate the light-receiving elements of each of the sensing regions; and a plurality of second test light-emitting elements. The elements are individually driven to the second
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. Second operation test means for respectively testing whether or not to operate, and at the time of the test of the first operation test means, the detection signal levels of the light receiving elements irradiated to each of the plurality of sensing regions are measured, A light extinction ratio calculating means for calculating a light extinction ratio for each of a plurality of sensing area directions of the translucent cover based on the respective measured values, and a calculated value of the light extinction ratio for each direction are set in advance. If the determination result of each sensing area by the stain degree determining means is affirmative, the reduction degree in the corresponding sensing area direction is decreased. Depending on the calculated value of luminous efficiency, Contamination compensating means for compensating the contamination in each sensing area direction of the translucent cover by changing the amplification factor of the amplifier for amplifying the output of the light receiving element or changing the threshold value for detecting fire. If the result of the determination of each sensing area by the contamination degree determining means is negative, a contamination limit notifying means for notifying the outside each of the signals indicating that the compensation of the contamination in the direction of the corresponding sensing area has exceeded the limit is automatically detected. During the test of the compensation and limit reporting means and the second operation testing means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and each sensing is performed based on the measured value. A light receiving sensitivity calculating means for calculating the light receiving sensitivity of the light receiving element for each area, and whether or not the calculated value of the light receiving sensitivity for each of the sensing areas is equal to or more than a lower limit value of a preset light receiving sensitivity allowable range. The light receiving sensitivity determining means for determining each of them and the output of the light receiving element of the corresponding sensing area according to the calculated value of the light receiving sensitivity of the corresponding sensing area when the determination result of each sensing area by the light receiving sensitivity determining means is affirmative. Light receiving sensitivity compensating means for respectively compensating for deterioration of light receiving sensitivity for each of the plurality of sensing areas by changing the amplification degree of an amplifier for amplifying or changing a threshold value for detecting fire, and the light receiving sensitivity determination When the determination result of each sensing area by the means is negative, the light receiving sensitivity limit reporting means for reporting the signal indicating that the compensation of the light receiving sensitivity of the corresponding sensing area exceeds the limit, and the automatic compensation of the light receiving sensitivity, and A radiant fire detector, which is provided with a limit reporting means. 7. A plurality of sensing areas are set in advance as a substantially independent three-dimensional space, and the radiant light emitted from the flame in each of the plurality of sensing areas set in advance is divided by the direction of each sensing area. A light-transmitting cover that transmits the light, a plurality of light-receiving elements that are provided inside the light-transmitting cover, and that receive the light transmitted by the direction of the light-transmitting cover for each sensing region, and the plurality of light-receiving elements. A radiation fire detector having means for detecting a fire in each of the plurality of sensing areas based on a detection signal of each light receiving element, wherein each of the plurality of sensing areas is provided outside the translucent cover. The first operation test means drives each of the sensing areas to emit a first pseudo-flame signal, which is transmitted through the light-transmitting cover to irradiate the light-receiving element of each of the sensing areas. A first test light emitting element having, first and the plurality of first test light emitting element is driven individually 1
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. First operation test means for testing whether or not each of the plurality of sensing areas operates, and each of the plurality of sensing areas is provided inside the light-transmitting cover, and each of the sensing areas is detected by the second operation testing means. A plurality of second test light-emitting elements that emit second pseudo-flame signals when driven, and directly or indirectly irradiate the light-receiving elements of each of the sensing regions; and a plurality of second test light-emitting elements. The elements are individually driven to the second
The pseudo-flame signal is emitted to individually illuminate the light receiving elements of each of the plurality of sensing areas, and the means for detecting a fire in each of the plurality of sensing areas is normally operated based on the detection signal of each of the light receiving elements. Second operation test means for respectively testing whether or not to operate, and at the time of the test of the first operation test means, the detection signal levels of the light receiving elements irradiated to each of the plurality of sensing regions are measured, A light extinction ratio calculating means for calculating a light extinction ratio for each of a plurality of sensing area directions of the translucent cover based on the respective measured values, and a calculated value of the light extinction ratio for each direction are set in advance. It is determined whether or not it is equal to or more than the lower limit value of the allowable range of extinction ratio and whether or not it is equal to or more than the preset lower limit value which is set to a value slightly above the lower limit value. The first and second contamination degree determining means, and the first contamination degree When the determination result of each sensing area by the loss determining means is affirmative, the amplification degree of the amplifier for amplifying the output of the light receiving element in the corresponding sensing area is changed according to the calculated value of the extinction ratio in the corresponding sensing area. Alternatively, by changing a threshold value for detecting a fire, a stain compensating means for compensating the stain in each sensing area direction of the translucent cover, and a sensing area of each of the sensing areas by the second stain degree determining means. When the determination result is negative, a signal indicating that the light-transmitting cover needs to be cleaned in the direction of the corresponding sensing area is sent to the outside, respectively, and the first signal is transmitted.
When the judgment result of each sensing area by the pollution degree judging means is negative, the pollution compensation means including the pollution status reporting means for notifying the outside each of the signals that the stain compensation in the corresponding sensing area exceeds the limit. And a status reporting means, and at the time of the test of the second operation testing means, the detection signal level of the light receiving element irradiated to each of the plurality of sensing areas is measured, and each sensing area is based on the measured value. A light receiving sensitivity calculating means for calculating the light receiving sensitivity of each light receiving element, and determining whether or not the calculated value of the light receiving sensitivity for each of the sensing areas is equal to or more than the lower limit value of a preset light receiving sensitivity allowable range, and First and second light receiving sensitivity determining means for respectively determining whether or not the value is a value slightly higher than the lower limit value and is equal to or larger than a preset lower limit value, and each of the first light receiving sensitivity determining means. Perception If the result of the area discrimination is affirmative, the amplification factor of the amplifier that amplifies the output of the light receiving element in the corresponding sensing area is changed or the fire detection threshold is detected according to the calculated light receiving sensitivity of the corresponding sensing area. When the determination result of each of the sensing areas by the light receiving sensitivity compensating means for compensating the deterioration of the light receiving sensitivity for each of the plurality of sensing areas by changing the value and the second light receiving sensitivity determining means is negative, the corresponding sensing is performed. When the advance signal of the deterioration of the light receiving sensitivity of the area is notified to the outside and when the result of the determination of each sensing area by the first light receiving sensitivity determining means is negative, the light receiving sensitivity compensation of the corresponding sensing area exceeds the limit. Radiation-type fire detector, which comprises: automatic compensation of light-reception sensitivity and status notification means including light-reception sensitivity status notification means for reporting the signal of 1.