JP7365470B2 - sensor - Google Patents

Description

The present invention relates to a sensor.

Conventionally, scattered light type fire detectors are known, which include a detection space provided in a light-shielded area that is shielded from light from the outside, and determine whether there is a fire by detecting the concentration of smoke that has entered this detection space. (For example, see Patent Document 1). This scattered light fire detector is equipped with a light emitting part that emits detection light and a light receiving part that receives light based on the detection light emitted from the light emitting part, and the detection light emitted from the light emitting part is detected. Scattered light generated by being scattered by smoke particles in the space is received by a light receiving section, the amount of light received by the light receiving section is compared with a determination threshold, and a fire is determined based on the comparison result. Ta.

However, in the scattered light type fire detector of Patent Document 1, the amount of scattered light changes depending on the particle size of smoke flowing into the detection space, which may change the sensitivity for determining fire. .

Therefore, a light-attenuating separation type sensor is equipped with a light-emitting device that emits detection light, and a light-receiving device that is provided at a position remote from the light-emitting device and that receives the detection light from the light-emitting device. A device was proposed. This attenuation-type separate sensor detects smoke and determines a fire based on the amount of decrease in the detection light received by the light receiving device.

Japanese Patent Application Publication No. 2011-248547

By the way, the inventor of the present application has used the above-mentioned technology of the attenuation type separation type sensor to obtain a general shape such as the shape of the scattered light type fire detector of Patent Document 1 (for example, a disk shape with a diameter of about 100 mm). etc.), we came up with the idea of manufacturing a dimming type sensor. That is, by providing a light emitting means having a configuration corresponding to a light emitting device and a light receiving means having a configuration corresponding to a light receiving device in a case having a general shape such as a disk shape with a diameter of about 100 mm, the reduction in energy consumption can be reduced. We came up with the idea of manufacturing a photodetector.

However, in the dimming type sensor manufactured in this way, it is assumed that not only smoke from a fire but also steam unrelated to a fire will be detected in the same way as smoke, and in reality, a fire may not occur. There was a possibility that a false alarm could be made to report a fire even though the fire had not been reported.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a sensor capable of reducing the frequency of occurrence of false alarms.

In order to solve the above-mentioned problem and achieve the object, the sensor according to claim 1 is a sensor, and includes a detection space into which a substance in a monitoring area flows, and a detection space in which the substance flows into the detection space. A first detection target detection means detects by a first detection method, and the substance flowing into the detection space is detected by the second detection method, which is a second detection method and is different from the first detection method. monitoring area abnormality determination means for determining an abnormality in the monitoring area based on a second detection object detection means, a detection result of the first detection object detection means, and a detection result of the second detection object detection means; The sensor includes: a light emitting device that emits detection light toward the detection space; and a dimming light receiver that receives the detection light from the light emitting device that can be attenuated by the substance flowing into the detection space. and a scattered light receiving means for receiving scattered light generated when the detection light from the light emitting means is scattered by the substance flowing into the detection space, and the first detection target detecting means includes: The scattered light receiving means detects the substance based on the scattered light received, and the second detection target detecting means detects the substance based on the detection light received by the dimming light receiving means, and the second detection target detecting means detects the substance based on the detection light received by the light reduction light receiving means. The area abnormality determination means includes a first process for detecting a possibility of an abnormality occurring in the monitoring area based on the detection result of the second detection target detection unit, and a first process for detecting the possibility of an abnormality occurring in the monitoring area in the first process. a second process of comparing the detection result of the first detection target detection means and the detection result of the second detection target detection means when the possibility is detected; and based on the comparison result in the second process. , a third process of determining the occurrence of an abnormality in the monitoring area, and in the third process, the monitoring area abnormality determining means determines whether an abnormality may occur in the monitoring area detected in the first process. The probability of occurrence of the abnormality in the monitoring area detected in the first process is due to the smoke, which is the detection target, that is caused by the occurrence of the abnormality, or the possibility of the abnormality occurring in the monitoring area, which is detected in the first process, is due to steam, which is not the detection target. If it is determined that the possibility of occurrence of an abnormality in the monitoring area detected in the first process is caused by the smoke, it is determined whether an abnormality has occurred in the monitoring area.

In the sensor according to claim 2, in the sensor according to claim 1, the monitoring area abnormality determination means identifies the type of smoke that has occurred due to the occurrence of the abnormality, and A process of identifying the type of abnormality based on the identification result is further performed.

According to the sensor according to claim 1, the problem can be solved.

It is a side view of the sensor concerning this embodiment. FIG. 3 is a bottom view of the sensor. FIG. 2 is a sectional view taken along the line AA in FIG. 1. FIG. FIG. 2 is a block diagram of a sensor. It is a flowchart of disaster prevention processing. FIG. 3 is a plan view of the inside of the light-shielding space. FIG. 3 is a plan view of the inside of the light-shielding space.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of a sensor according to the present invention will be described in detail based on the drawings. Note that the present invention is not limited to this embodiment.

[Basic concept of embodiment]
First, the basic concept of the embodiment will be explained. Embodiments generally relate to sensors.

Here, a "sensor" is a device that determines an abnormality in a monitoring area. Specifically, it is a device that determines an abnormality by detecting a detection target in the monitoring area, such as a smoke detector, a fire alarm, etc. The concept includes a sensor, a gas sensor, etc., and, as an example, includes a detection space, a first detection object detection means, a second detection object detection means, and a monitoring area abnormality determination means. Note that the "monitoring area" is an area that is monitored by a sensor, and specifically, it is a space with a certain extent, indoors or outdoors, for example, This concept includes spaces such as corridors, stairs, and rooms in buildings. Furthermore, "abnormality in the monitoring area" refers to a situation in the monitoring area that is different from normal, and is a concept that includes, for example, fire, gas leak, and the like. Further, the term "detection target" refers to a target to be detected by a sensor, and specifically relates to an abnormality in a monitoring area, and is a concept that includes, for example, smoke, carbon monoxide gas, and the like.

Further, the "detection space" is a space into which the detection target of the monitoring area flows, and is, for example, a space that is shielded from light from the outside of the sensor.

Furthermore, the "first detection object detection means" is a means for detecting the detection object flowing into the detection space by the first detection method, and the "second detection object detection means" is the means for detecting the detection object flowing into the detection space. This is means for detecting an object using a second detection method. Note that the "first detection method" is any method for detecting a detection target, for example, a method for detecting smoke. For example, when smoke is irradiated with detection light, This is a scattered light detection method that detects smoke using scattered light generated by irradiation with detection light. In addition, the "second detection method" is any method for detecting a detection target, and specifically, it is a method different from the first detection method, for example, a method for detecting smoke. is an attenuation type detection method that detects smoke by utilizing the fact that when smoke is irradiated with detection light, the detection light is attenuated as the smoke is irradiated with the detection light. Note that "detection light" is light for detecting a detection target, for example, light for detecting smoke. Further, "scattered light" is light generated based on the detection light and the detection target, and is, for example, light generated when the detection target is irradiated with smoke and scattered. Moreover, "to reduce light" is a concept corresponding to a decrease in the intensity of light.

Furthermore, the "monitoring area abnormality determining means" is a monitoring area abnormality determining means that determines an abnormality in the monitoring area based on the detection result of the first detection target detection means and the detection result of the second detection target detection means. be.

In the embodiment shown below, a case will be described in which the "monitoring area" is a "room in a building", the "abnormality in the monitoring area" is "fire", and the "detection target" is "smoke". . In addition, the numerical values shown in the embodiments below are shown as examples for convenience of explanation, and in reality, numerical values other than the exemplified values may be used as long as the concept shown in the embodiments is followed. It's okay.

[Specific contents of embodiment]
Next, specific contents of the embodiment will be explained.

(composition)
First, the configuration of the sensor according to this embodiment will be explained. FIG. 1 is a side view of the sensor according to the present embodiment, FIG. 2 is a bottom view of the sensor, FIG. 3 is a sectional view taken along the line A--A in FIG. 1, and FIG. , is a block diagram of a sensor. For convenience of explanation, in FIG. 1, the outside of the sensor 100 is shown by a broken line, and the inside is shown by a solid line, and in FIG. It is a sectional view showing a part of the inside, and hatching is omitted as appropriate. In addition, in the following explanation, the X-Y-Z directions shown in FIGS. 1 to 3 are mutually orthogonal directions, and specifically, the Z direction is a vertical direction, and the X direction and Y direction are vertical directions. For example, the Z direction will be referred to as the height direction, the +Z direction will be referred to as the upper side (plane), and the -Z direction will be referred to as the lower side (bottom surface). In addition, the following terms related to "X-Y-Z direction" are convenient expressions for explaining the relative positional relationship (or direction) of each component in the illustrated sensor 100. In the following description, the direction away from the light-shielding space 13 will be referred to as "outside" and the direction approaching the light-shielding space 13 will be referred to as "inner" with reference to the center position of the light-shielding space 13 in FIG. 3.

The detector 100 shown in each of these figures is a device that determines an abnormal fire by detecting smoke, which is a detection target in a monitoring area. Specifically, as shown in FIG. It is used by being attached to the installation surface 900, which is a ceiling surface, and includes, for example, the mounting base 11, the housing 12, the light-shielding space 13 in FIG. 3, the insect screen 14 in FIG. 1, the communication section 21, and the alarm section 22 in FIG. , a recording section 23, and a control section 24.

(Configuration - mounting base)
The mounting base 11 in FIG. 1 is a mounting means for mounting the housing 12 on the installation surface 900. The specific type and configuration of this mounting base 11 is arbitrary, but for example, it may be used between the housing 12 and the installation surface 900, and may be a known fixing means (for example, screws or a fitting structure, etc.). ) is fixed by

(Configuration - housing)
The housing 12 in FIG. 1 is a housing means for housing various components of the sensor 100. The specific type and configuration of this casing 12 is arbitrary, but for example, a cylindrical part provided on the upper side (+Z direction) in the height direction (Z direction), and a cylindrical part provided on the lower side (+Z direction) from this cylindrical part -Z direction), and is formed by a dome-shaped portion that is formed to protrude in the -Z direction), and is provided with an opening 121 shown in FIG.

(Configuration - Housing - Opening)
The opening 121 in FIG. 2 is an inflow means for allowing gas to flow into the housing 12, and is an outflow means for causing gas to flow out from the housing 12. Although the specific type and configuration of the openings 121 are arbitrary, for example, a plurality of openings 121 may be provided in a dome-shaped portion of the housing 12.

(Configuration - light-shielded space)
The light-shielded space 13 in FIG. 3 is a light-shielded space into which smoke, which is a detection target of the monitoring area, flows. The specific type and configuration of this light-shielding space 13 is arbitrary, but for example, it may be provided in a portion corresponding to the dome-shaped portion of the casing 12 in FIG. 132, and a labyrinth (not shown), and also includes the light emitting section 151, scattered light receiving section 152, dimming light receiving section 153, reflecting section 154, light shielding section 155, and scattered light detection space shown in FIG. A1, and a detection space A2 for light attenuation.

(Configuration - Shade space - Base part, cover part, and labyrinth)
The base portion 131, the cover portion 132, and the labyrinth (not shown) in FIG. 1 are partitioning means for partitioning the light-shielding space 13, and can be configured in the same manner as in the past, but for example, they may be configured as follows. There is. The base portion 131 is a light shielding means that blocks light from outside the sensor 100, and surrounds the light shielding space 13 from above (+Z direction), for example. The cover part 132 is a light shielding means for shielding light from the outside of the sensor 100, and for example, surrounds the light shielding space 13 from the lower side (-Z direction). The labyrinth (not shown) is a light-shielding inflow/output means that allows gas to flow in and out while blocking light from outside the sensor 100, and specifically surrounds the light-shielding space 13 from the side. For example, they are arranged in a circle.

(Configuration - Shade space - Light emitting part)
The light emitting unit 151 is a light emitting unit that emits detection light toward the scattered light detection space A1. Although the specific type and configuration of this light emitting section 151 are arbitrary, for example, it can be configured using a light emitting diode or the like.

(Configuration - Detection space - Scattered light receiver)
The scattered light receiving section 152 is a scattered light receiving means that receives scattered light generated when the detection light from the light emitting section 151 is scattered by smoke flowing into the scattered light detection space A1. Although the specific type and configuration of this scattered light receiving section 152 are arbitrary, for example, it can be configured using a photodiode or the like.

(Configuration - detection space - dimming light receiving section)
The dimming light receiving section 153 is a dimming light receiving means that receives the detection light from the light emitting section 151 that can be dimmed by smoke flowing into the detection space A2 for dimming. Although the specific type and configuration of this dimming light receiving section 153 are arbitrary, for example, like the scattered light receiving section 152, it can be configured using a photodiode or the like.

(Configuration - detection space - reflection part)
The reflecting section 154 is a reflecting means that reflects the detection light from the light emitting section 151 to the dimming light receiving section 153. The specific type and configuration of the reflecting portions 154 are arbitrary, but for example, three reflecting portions 154 are provided, at least two are provided parallel to each other, and , a reflective mirror that reflects at a relatively high reflectance (for example, 90% to 95% or more) can be used.

(Configuration - detection space - light shielding part)
The light blocking section 155 is a light blocking means for preventing the detection light from the light emitting section 151 from directly entering the scattered light receiving section 152 . Although the specific type and configuration of the light shielding portion 155 are arbitrary, for example, it can be constructed using a light shielding material such as a black resin material.

(Configuration - detection space - detection space for scattered light)
The scattered light detection space A1 is the above-mentioned detection space, specifically, a space where scattered light is generated. For example, the scattered light detection space A1 is a space where scattered light is generated. These are the intersection where the optical axis intersects and the space around the intersection. The specific type and configuration of this scattered light detection space A1 are arbitrary, but for example, if the optical axis (not shown) of the light emitting section 151 is not directed directly toward the scattered light receiving section 152, and the light emitting section 151 is It is constructed by arranging these parts so that the optical axis (not shown) and the optical axis (not shown) of the scattered light receiving section 152 intersect. In FIG. 3, this scattered light detection space A1 is illustrated as a circle with a thin broken line for convenience of explanation.

(Configuration - detection space - detection space for dimming)
The detection space A2 for dimming is the above-mentioned detection space, and specifically is a space where the detection light can be dimmed by smoke, for example, the optical path of the detection light from the light emitting section 151 to the dimming light receiving section 153. and the space around the optical path. The specific type and configuration of this detection space A2 for light attenuation is arbitrary, but for example, it may be configured such that at least a part of the detection space A2 for light attenuation overlaps with the detection space A1 for scattered light. be. In addition, in FIG. 3, this detection space A2 for light attenuation is illustrated as a rectangle with a thin broken line for convenience of explanation.

(Composition - Insect net)
The insect repellent net 14 shown in FIG. 1 is an insect repellent means that prevents insects from entering the light-shielding space 13. The specific type and configuration of the insect screen 14 are arbitrary, but for example, it allows gas to flow in or out between the outside and the inside of the light-shielding space 13 through small holes in the insect screen 14 itself. On the other hand, it is configured to prevent insects from entering the light-shielding space 13, and it also covers a labyrinth (not shown) from the outside and is arranged in a circular shape. It is.

(Configuration - Communication Department)
The communication unit 21 in FIG. 4 is a communication means for communicating with an external device (for example, a disaster prevention receiver, etc., not shown). Although the specific type and configuration of this communication section 21 are arbitrary, it can be configured using, for example, a known communication circuit.

(Configuration - Alarm section)
The alarm section 22 in FIG. 4 is an alarm means that outputs an alarm when the sensor 100 determines a fire. Although the specific type and configuration of the alarm section 22 is arbitrary, it may include, for example, a speaker (not shown) that outputs an alarm with sound, or an indicator light 221 shown in FIG. 2 that outputs an alarm with a light-emitting display. It is something.

(Configuration - Recording section)
The recording unit 23 in FIG. 4 is a recording means for recording programs and various data necessary for the operation of the sensor 100, and is configured using, for example, an EEPROM or a Flash memory. However, instead of or in addition to EEPROM and Flash memory, external storage devices such as hard disks, magnetic recording media such as magnetic disks, optical recording media such as DVDs and Blu-ray discs, ROM, USB memory, and SD Any other storage medium can be used, including electrical storage media such as cards.

(Configuration - control section)
The control unit 24 in FIG. 4 is a control unit that controls the sensor 100, and specifically includes a CPU, various programs that are interpreted and executed on the CPU (basic control programs such as an OS, and (including application programs that implement specific functions) and an internal memory such as a RAM for storing programs and various data. In particular, the control program according to the embodiment substantially configures each part of the control unit 24 by being installed in the sensor 100 via an arbitrary recording medium or network.

Functionally, the control unit 24 includes a scattered light detection unit 241, a dimming detection unit 242, and a monitoring area abnormality determination unit 243. The scattered light detection unit 241 is a first detection target detection unit that detects smoke flowing into the detection space A1 for scattered light using a first detection method, and for example, based on the scattered light received by the scattered light reception unit 152. This is first detection target detection means for detecting smoke. The light reduction detection unit 242 is a second detection object detection means that detects the detection object flowing into the light reduction detection space A2 using a second detection method, which is different from the first detection method. For example, it is a second detection target detection means that detects smoke based on the detection light received by the light-reducing light receiving section 153. The monitoring area abnormality determination unit 243 is a monitoring area abnormality determination unit that determines whether there is a fire in the monitoring area based on the detection result of the scattered light detection unit 241 and the detection result of the dimming detection unit 242. The processing performed by each part of the control unit 24 will be described later.

(process)
Next, a description will be given of disaster prevention processing executed by the sensor 100 configured as described above.

(Processing - disaster prevention processing)
FIG. 5 is a flowchart of the disaster prevention process (steps are abbreviated as "S" in the description of each process below). "Disaster prevention processing" is processing for disaster prevention, and specifically, processing for determining fire. Although the timing of executing this disaster prevention process is arbitrary, for example, the disaster prevention process will be explained starting from the start, assuming that it is repeatedly activated and executed after the power of the sensor 100 is turned on.

First, in SA1 of FIG. 5, the monitoring area abnormality determination unit 243 determines whether a fire (abnormality) has occurred in the monitoring area. Although the specific details are arbitrary, for example, as shown below, the concentration is detected and then a fire is determined using the concentration.

In detail, first, the scattered light detection unit 241 accesses the scattered light receiving unit 152 in FIG. intensity) is continuously acquired, and the concentration is calculated and detected using a predetermined method based on the acquired output values. Note that the method for calculating the concentration here is arbitrary, and may be any method including a known method that calculates by focusing on the fact that the intensity of scattered light increases as the concentration of smoke in the detection space A1 for scattered light increases. method can be used. Further, the dimming detection unit 242 accesses the dimming light receiving unit 153 and continuously acquires the output value of the photodiode of the dimming light receiving unit 153 (that is, the intensity of the detection light received by the dimming light receiving unit 153). Then, the concentration is calculated and detected using a predetermined method based on the obtained output value. Note that the method for calculating the concentration here is arbitrary, and may be any method including a known method that calculates by focusing on the fact that the intensity of the detected light decreases as the concentration of smoke in the detection space A2 for dimming increases. method can be used.

Next, the monitoring area abnormality determination section 243 determines a fire using at least the concentration detected by the scattered light detection section 241 and the concentration detected by the dimming detection section 242. The specific method here is arbitrary, but for example, the light shielding space 13 in FIG. There is a possibility that steam (smoke) or steam that may be mistaken for smoke may flow in, causing a delay in determining whether there is a fire even though there is a fire, or even when there is no fire. It is necessary to prevent a fire from being erroneously determined in spite of the situation, and to appropriately determine a fire. As an example, the determination is made as follows. Note that a "flaming fire" is, for example, a fire that generates smoke with relatively small particle diameters, and a fire that generates black smoke. Furthermore, a "smoking fire" is, for example, a fire that generates smoke with relatively large particle diameters (smoke that has larger particle diameters than smoke from a flaming fire), and is a fire that generates white smoke.

Specifically, the inventor conducted an experiment or simulation on the detection sensitivity of the scattered light detector 241 and the dimming detector 242 for first smoke, second smoke, and steam, and obtained the following results. However, a determination method based on this result will be used. As for the results, the dimming detection unit 242 detects the first smoke, second smoke, and steam with mutually similar sensitivities; for example, in reality, the first smoke, the second smoke, and the steam For the smoke and steam in No. 2, the concentrations of "first smoke" = "1.0", "second smoke" = "1.0", and "steam" = "1.0" are detected. (The numerical values are normalized based on the second smoke concentration). Further, the scattered light detection unit 241 detects the first smoke, second smoke, and steam with mutually different sensitivities, and for example, actually detects the same first smoke and second smoke. , and the results of detecting the concentrations of "first smoke" = "0.5", "second smoke" = "1.0", and "steam" = "3.0" for steam. (The numerical values are normalized based on the second smoke concentration, as described above). Note that the sensitivities of the scattered light detection section 241 and the light reduction detection section 242 to the "second smoke" are similar to each other, and it is assumed that similar concentrations are detected. According to this result, for the second smoke with a predetermined concentration, the scattered light detection unit 241 and the dimming detection unit 242 detect the same concentration, and for the first smoke with a predetermined concentration, The scattered light detection unit 241 is less sensitive than the light reduction detection unit 242 and detects a concentration that is about half, and for steam with a predetermined concentration, the scattered light detection unit 241 has a lower sensitivity than the light reduction detection unit 242. It was confirmed that the sensitivity was sharp and that it could detect concentrations approximately three times higher. Then, based on these results, the monitoring area abnormality determination unit 243 detects the possibility of a fire outbreak based on the concentration detected by the dimming detection unit 242, and then determines the possibility of a fire outbreak based on the concentration detected by the dimming detection unit 242. It is configured to compare the concentration detected by the scattered light detection unit 241 to determine whether the detected fire is likely to be caused by smoke or steam. This will be explained below.

More specifically, it is assumed that the recording unit 23 records a concentration threshold value, which is a concentration used as a threshold value for determining a fire, and the monitoring area abnormality determination unit 243 first detects the concentration detected by the dimming detection unit 242. Obtain the density (hereinafter referred to as the attenuation side density), compare the obtained attenuation side density with the density threshold of the recording unit 23, and if the attenuation side density is less than the density threshold, no fire has occurred. SA1 is repeatedly executed until it is determined that a fire has occurred (NO in SA1). In addition, when the attenuation side concentration is equal to or higher than the concentration threshold, the possibility of fire occurrence is detected, and the concentration detected by the scattered light detection unit 241 (hereinafter referred to as the scattering side concentration) is acquired, and the acquired scattering side concentration is As confirmed by the results of the experiment mentioned above, if the concentration on the scattering side is about three times the concentration on the attenuation side, it is determined that the concentration is due to steam. If the concentration on the scattering side is less than or equal to the concentration on the attenuation side (in other words, 1 times), it is likely that the cause is a fire. Then, the judgment is made as follows. Specifically, the cutoff threshold, which is the threshold for distinguishing whether something is caused by smoke or steam, is a value that is smaller than the value corresponding to about three times the above value, and the above value. Assuming that a numerical value, for example "2.0", which is larger than the numerical value corresponding to approximately equal magnification (that is, 1 times) or less, is recorded in the recording unit 23, it is determined as follows. The monitoring area abnormality determination unit 243 divides the scattering side concentration by the light-attenuating side density (“scattering side density” ÷ “attenuating side density”), and compares the calculation result with the cutting threshold of the recording unit 23. If the calculation result is equal to or higher than the cutoff threshold, it is determined that the fire is not caused by steam (NO in SA1), and the fire is determined to be caused by steam. SA1 is repeatedly executed until it is determined that In addition, if the calculation result is less than the cutoff threshold, it is determined that the fire is likely to be caused by a fire rather than steam (YES in SA1), and the process moves to SA2. .

Here, for example, a flaming fire occurs, and "first smoke" that is smoke from the fire passes through the opening 121 in FIG. 2, the insect screen 14 in FIG. When the light enters the space 13 and then enters the scattered light detection space A1 and the light attenuation detection space A2, the light attenuation side concentration becomes equal to or higher than the concentration threshold, and the division of the light attenuation side concentration by the scattering side concentration Since the calculated value is "0.5" (that is, less than the cutoff threshold), it is determined that a fire has occurred. For example, when a smoking fire occurs, the "second smoke" from the fire enters the scattered light detection space A1 and the light attenuation detection space A2 in the same way as the "first smoke". In this case, the attenuation side concentration is equal to or higher than the concentration threshold, and the calculated value of dividing the attenuation side concentration by the scattering side concentration becomes "1.0" (that is, less than the cutoff threshold), so a fire occurs. It will be determined that the For example, if a fire has not occurred and steam enters the scattered light detection space A1 and the light reduction detection space A2 in the same manner as the "first smoke", the light reduction side concentration is equal to or higher than the concentration threshold. However, since the calculated value of dividing the attenuation side concentration by the scattering side concentration becomes "3.0" (that is, greater than or equal to the cutoff threshold), it is determined that no fire has occurred. In other words, it is possible to prevent delays in determining a fire even though a fire has occurred, or erroneously determining a fire even though no fire has occurred. becomes. Further, for example, since the light emitting section 151 that outputs detection light can be used in common for the scattered light receiving section 152 and the dimming light receiving section 153, the light emitting section 151 can be Even if the detected concentration changes, it is possible to prevent the intensity of the light received by the scattered light receiving section 152 and the dimming light receiving section 153 from varying due to this change.

At SA2 in FIG. 5, the control unit 24 issues an alarm. Although the specific details are arbitrary, for example, a known method is used to issue a warning of the occurrence of a fire via a speaker (not shown) of the alarm unit 22 in FIG. 4 or the indicator light 221 in FIG. 2. Here, for example, a warning message such as "Fire has been detected" is repeatedly output through a speaker, and an indicator light 221 is lit in red to display the message.

At SA3 in FIG. 5, the control unit 24 determines whether or not to restore. Although it is specifically arbitrary, for example, by a user's predetermined operation on the disaster prevention receiver (not shown), whether or not a recovery signal transmitted from the disaster prevention receiver is received via the communication means (not shown) of the sensor 100. Judgment based on If the restoration signal has not been received, it is determined that the restoration will not be performed (NO in SA3), and SA3 is repeatedly executed until it is determined that the restoration is to be performed. Further, when a restoration signal is received, it is determined that restoration is to be performed (YES in SA3), and the process moves to SA4. Here, for example, if the user does not perform a predetermined operation on the disaster prevention receiver (not shown), it will be determined that recovery will not occur; If it does, it will be determined that it will be restored.

At SA4 in FIG. 5, the control unit 24 performs restoration. Specifically, after recovery is performed by stopping the alarm issued in SA2, the process ends. This completes the disaster prevention process.

(Effects of embodiment)
As described above, according to the present embodiment, by determining whether there is a fire in the monitoring area based on the detection result of the scattered light detection unit 241 and the detection result of the light reduction detection unit 242, for example, smoke can be detected by Since it can be detected using a detection method, abnormalities in the monitoring area can be determined from multiple perspectives, and the frequency of occurrence of false alarms that report an abnormality even though no abnormality has actually occurred in the monitoring area can be determined. It becomes possible to reduce the

Further, the scattered light detection section 241 detects smoke based on the scattered light received by the scattered light receiving section 152, and the dimming detection section 242 detects smoke based on the detected light received by the dimming light receiving section 153. By detecting the It is possible to determine abnormalities in the monitoring area by taking advantage of the advantage of detecting the detection target (for example, the detection sensitivity is constant regardless of the type of smoke that is the detection target). It becomes possible to improve the judgment accuracy of the fire committee.

Furthermore, by providing the reflection section 154, the optical path length of the detection light can be extended, for example, so that the detection light can be sufficiently attenuated by smoke flowing into the detection space A2 for dimming, and the monitoring area This makes it possible to further improve the accuracy of fire detection.

Furthermore, by providing at least two reflecting portions 154 in parallel with each other, it is possible to reflect the detection light in any direction, for example, thereby improving the degree of freedom in designing the sensor. becomes possible.

[Modifications to the embodiment]
The embodiments according to the present invention have been described above, but the specific structure and means of the present invention may be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. I can do it. Hereinafter, such a modified example will be explained.

(About the problems to be solved and the effects of the invention)
First of all, the problems to be solved by the invention and the effects of the invention are not limited to the above-mentioned content, but may differ depending on the implementation environment and configuration details of the invention, and only some of the problems described above can be solved. In some cases, the above-mentioned effects may be solved or only some of the above-mentioned effects may be achieved.

(About distribution and integration)
Further, the above-described configuration is functional and conceptual, and does not necessarily need to be physically configured as shown in the drawings. That is, the specific form of dispersion or integration of each part is not limited to that shown in the drawings, and all or part of the parts can be configured by being functionally or physically distributed or integrated in arbitrary units.

(About fire determination (Part 1))
Further, the fire determination method described in SA1 of FIG. 5 of the above embodiment may be arbitrarily changed. For example, a threshold value for comparison with the scattering side concentration and a threshold value for comparison with the attenuation side concentration may be arbitrarily determined and recorded, and each concentration and each threshold value may be compared to determine a fire based on the comparison results. . Further, for example, a fire may be determined by focusing on the rate of change of the scattering side concentration and the attenuation side concentration.

(About fire determination (Part 2))
Further, as explained in SA1 of FIG. 5 of the above embodiment, the light attenuation detection unit 242 detects the first smoke, the second smoke, and the steam with mutually similar sensitivity, and Regarding the scattered light detection unit 241, focusing on detecting the first smoke, second smoke, and steam with mutually different sensitivities, the monitoring area abnormality determination unit 243 only distinguishes between smoke and steam. Instead, the configuration may be such that the type of smoke (for example, the above-mentioned "first smoke" and "second smoke") is separated, and the type of fire that has occurred is also separated. In this case, in SA2, the type of fire may also be reported and an alarm may be issued.

(About constituent elements (Part 1))
Further, in FIG. 3 of the above embodiment, the number, arrangement, etc. of the components in the light-shielding space 13 may be changed arbitrarily. For example, a plurality of scattered light detection spaces A1 may be provided on the optical path of the detection light by providing not only one but a plurality of scattered light receiving means such as the scattered light receiving section 152, such as two or more. In this case, based on the intensity of the scattered light received by any one of the plurality of scattered light receiving means (for example, the one arbitrarily selected, or the one receiving the highest intensity of scattered light, etc.) The processing of the embodiment may be performed by detecting the concentration. When configured in this way, by providing a plurality of scattered light receiving means, for example, scattered light can be reliably received, so that it is possible to further improve the accuracy of determining abnormalities in the monitoring area. Become.

(About constituent elements (Part 2))
Further, for example, instead of only one light emitting means such as the light emitting section 151, a plurality of light emitting means, such as two or more, may be provided. Furthermore, for example, the reflecting section 154 may be omitted and the light attenuating light receiving section 153 may directly receive the detection light of the light emitting section 151.

(About constituent elements (Part 3))
Further, for example, the direction of the scattered light receiver 152 is arbitrary, and as shown in FIG. (in detail, the angle formed by the line segment connecting the light emitting section 151 and the center of the scattered light detection space A1 and the center of the scattered light receiving section 152 and the scattered light detection space A1). The internal angle formed by the line segment connecting the two may be an obtuse angle. For example, although not shown, the scattered light receiving section 152 may be arranged such that the angle formed by the unillustrated optical axis of the light emitting section 151 and the unillustrated optical axis of the scattered light receiving section 152 is a right angle or an acute angle. may be arranged to mainly receive scattered light other than forward scattered light.

(About constituent elements (Part 4))
Further, for example, when a plurality of scattered light receiving means such as the scattered light receiving section 152 are provided, the plurality of scattered light receiving means may be provided at mutually different angles with respect to the same scattered light detection space A1. . With this configuration, the particle size of the smoke to be detected can be determined based on the scattering characteristics, and the type of smoke or discrimination between smoke and non-smoke can be performed with higher accuracy.

(About parts placement)
Furthermore, for example, the arrangement of the light emitting section 151, the scattered light receiving section 152, the dimming light receiving section 153, the reflecting section 154, and the light shielding section 155 (hereinafter referred to as "internal parts") in FIG. 3 may be arbitrarily changed. Good too. 6 and 7 are plan views of the interior of the light-shielding space. For example, as shown in FIG. 6, a light emitting section 151A, a scattered light receiving section 152A, a light attenuation receiving section 153A, a reflecting section 154A, and a light shielding section 155A having the same configuration as "each internal component" may be arranged. As shown in FIG. 7, a light emitting section 151B, a scattered light receiving section 152B, a light attenuation receiving section 153B, a reflecting section 154B, and a light shielding section 155B having the same configuration as "each internal component" may be arranged. In particular, when arranged as shown in FIG. 6, at least two of the three reflective parts 154A are perpendicular to each other, and at least two reflective parts 154A are parallel to each other. Alternatively, when arranged as shown in FIG. 7, a shielding wall 156 that blocks light may also be provided. In this case, as shown in FIG. 6, at least the light emitting section 151A, the scattered light receiving section 152A, and the dimming light receiving section 153A are provided together in a part of the area, or as shown in FIG. It becomes possible to provide the light emitting section 151B, the scattered light receiving section 152B, and the dimming light receiving section 153B together in a certain area. When arranged as shown in FIG. 6 or 7, the detection light may be guided in an annular shape as a whole (especially in FIG. 6), or the detection light may be guided in a substantially rectangular shape (in particular, (Fig. 7), a sufficient optical path length can be ensured, and a fire can be reliably determined. Note that "substantially rectangular" is a concept indicating a shape such as a rectangle, and includes, for example, a U-shape in which a part of a rectangle is missing, as shown in FIG. 7.

As shown in FIG. 6, by providing at least two or more reflecting portions 154A so as to be perpendicular and parallel to each other, it is possible to reflect the detection light in any direction, for example. It becomes possible to improve the degree of freedom in the design of the device.

Further, as shown in FIG. 6, the detection light is annularly guided and the light emitting section 151A, the scattered light receiving section 152A, and the light attenuation receiving section 153A are provided together, so that, for example, the sensor Since the detection light can be guided throughout the space into which smoke flows, it is possible to further improve the accuracy of determining abnormalities in the monitoring area. Further, for example, the board installation in the light emitting section 151A, the scattered light receiving section 152A, and the dimming light receiving section 153A becomes compact, making it possible to reduce the cost and space of the sensor.

Further, as shown in FIG. 7, the detection light is guided in a substantially rectangular shape, and the light emitting section 151B, the scattered light receiving section 152B, and the light attenuation receiving section 153B are provided together, so that, for example, Since the detection light can be guided throughout the space into which smoke flows into the sensor, it is possible to further improve the accuracy of determining abnormalities in the monitoring area. Further, for example, the board installation in the light emitting section 151B, the scattered light receiving section 152B, and the dimming light receiving section 153B becomes compact, making it possible to reduce the cost and space of the sensor.

(About steric configuration)
Furthermore, for example, the "internal parts" in FIG. 3 may be arranged three-dimensionally relative to each other, and in the same way, the parts shown in FIGS. 6 and 7 may also be arranged three-dimensionally relative to each other.

(About installation location)
Furthermore, the sensor 100 may be installed and used on a wall surface of the monitoring area instead of on the ceiling surface.

(About the alarm part)
In addition, in place of the alarm unit 22 of the above embodiment, a communication unit that performs wireless or wired communication, a transfer unit that transfers fire alerts, etc. is provided, so that the results of abnormality determination can be transmitted to other equipment, etc. It may be configured to send to. Note that these communication units or relay units may be provided together with the alarm unit 22 rather than in place of the alarm unit 22.

(About features)
Further, the features of the above embodiments and the features of the modified examples may be combined arbitrarily.

(Additional note)
The sensor of Supplementary note 1 includes a detection space into which a detection object in a monitoring area flows, a first detection object detection means for detecting the detection object flowing into the detection space using a first detection method, and a first detection object detection means for detecting the detection object flowing into the detection space using a first detection method. a second detection target detection means for detecting the detection target using a second detection method that is different from the first detection method; and a detection result of the first detection target detection means; monitoring area abnormality determination means for determining abnormality in the monitoring area based on the detection result of the second detection target detection means.

The sensor according to Supplementary note 2 is the sensor according to Supplementary note 1, which includes a light emitting means that emits detection light toward the detection space, and a light emitting means from the light emitting means that can be attenuated by the detection target flowing into the detection space. comprising: a light-reducing light receiving means for receiving the detection light; and a scattered light receiving means for receiving scattered light generated when the detection light from the light emitting means is scattered by the detection target flowing into the detection space, The first detection target detection means detects the detection target based on the scattered light received by the scattered light receiving means, and the second detection target detection means detects the detection target based on the detected light received by the dimming light receiving means. The detection target is detected based on.

The sensor according to Supplementary note 3 is the sensor according to Supplementary note 2, and includes a reflecting means for reflecting the detection light from the light emitting means to the attenuating light receiving means.

The sensor according to appendix 4 is the sensor according to appendix 3, in which at least two reflecting means are provided so as to be perpendicular or parallel to each other.

The sensor according to appendix 5 is the sensor according to appendix 3 or 4, in which the reflecting means reflects the detection light and guides the detection light in a circular shape within the sensor, and the light emitting means and the The dimming light receiving means and the scattered light receiving means are provided together.

The sensor according to appendix 6 is the sensor according to appendix 3 or 4, in which the reflecting means reflects the detection light and guides the detection light in a substantially rectangular shape within the sensor, and the light emitting means , the light attenuation light receiving means, and the scattered light receiving means are provided together.

The sensor according to appendix 7 is the sensor according to any one of appendixes 2 to 6, in which a plurality of the scattered light receiving means are provided.

(Effect of appendix)
According to the sensor described in Supplementary Note 1, by determining an abnormality in the monitoring area based on the detection result of the first detection target detection means and the detection result of the second detection target detection means, for example, the detection target is detected. can be detected using multiple detection methods, making it possible to determine abnormalities in the monitoring area from multiple perspectives. This makes it possible to reduce the frequency of occurrence.

According to the sensor described in Appendix 2, the first detection target detection means detects the detection target based on the scattered light received by the scattered light reception means, and the second detection target detection means detects the detection target based on the scattered light received by the scattered light reception means. By detecting the detection target based on the detection light received by the means, for example, the advantage of detecting the detection target using scattered light (for example, smoke, which is the detection target, and steam, which is not the detection target, are mutually By taking advantage of the advantages of detecting the detection target using detection light (for example, the fact that the detection sensitivity is constant regardless of the type of smoke that is the detection target), the monitoring area can be It is possible to determine abnormalities in the monitoring area, and it is possible to improve the accuracy of determining abnormalities in the monitoring area.

According to the sensor described in Appendix 3, by including the reflecting means, for example, the optical path length of the detection light can be extended, so that the detection light can be sufficiently attenuated at the detection target that has entered the detection space. This makes it possible to further improve the accuracy of determining abnormalities in the monitoring area.

According to the sensor described in Appendix 4, since at least two or more reflecting means are provided so as to be perpendicular or parallel to each other, the detection light can be reflected in any direction, for example. It becomes possible to improve the degree of freedom in designing the sensor.

According to the sensor described in Appendix 5, the detection light is annularly guided, and the light emitting means, the dimming light receiving means, and the scattered light receiving means are provided together, so that, for example, the sensor Since the detection light can be guided throughout the space into which smoke flows, it is possible to further improve the accuracy of determining abnormalities in the monitoring area. Furthermore, for example, the substrates for the light emitting means, the light receiving means at reduced light intensity, and the scattered light receiving means can be installed compactly, making it possible to reduce the cost and space of the sensor.

According to the sensor described in Supplementary Note 6, the detection light is guided in a substantially rectangular shape, and the light emitting means, the dimming light receiving means, and the scattered light receiving means are provided together, so that, for example, Since the detection light can be guided throughout the space into which smoke flows into the sensor, it is possible to further improve the accuracy of determining abnormalities in the monitoring area. Furthermore, for example, the substrates for the light emitting means, the light receiving means at reduced light intensity, and the scattered light receiving means can be installed compactly, making it possible to reduce the cost and space of the sensor.

According to the sensor described in Appendix 7, since a plurality of scattered light receiving means are provided, for example, scattered light can be reliably received, thereby further improving the accuracy of determining abnormalities in the monitoring area. becomes possible. Furthermore, for example, the particle size of the smoke to be detected can be determined based on the scattering characteristics, and the type of smoke or discrimination between smoke and non-smoke can be performed with higher accuracy.

11 Mounting base 12 Housing 13 Light-shielding space 14 Insect screen 21 Communication section 22 Alarm section 23 Recording section 24 Control section 100 Sensor 121 Opening section 131 Base section 132 Cover section 151 Light emitting section 151A Light emitting section 151B Light emitting section 152 Scattered light receiving section 152A Scattered light receiving section 152B Scattered light receiving section 153 Dimming light receiving section 153A Dimming light receiving section 153B Dimming light receiving section 154 Reflecting section 154A Reflecting section 154B Reflecting section 155 Light blocking section 155A Light blocking section 155B Light blocking section 156 Shielding wall 221 Indicator lamp 241 Scattered light detection unit 242 Light reduction detection unit 243 Monitoring area abnormality determination unit 900 Installation surface A1 Scattered light detection space A2 Light reduction detection space

Claims (2)

A sensor,
a detection space into which substances in the monitoring area flow;
first detection target detection means for detecting the substance flowing into the detection space using a first detection method;
a second detection target detection means for detecting the substance flowing into the detection space using the second detection method, which is a second detection method and is different from the first detection method;
monitoring area abnormality determination means for determining an abnormality in the monitoring area based on the detection result of the first detection object detection means and the detection result of the second detection object detection means;
The sensor is
a light emitting unit that emits detection light toward the detection space;
Attenuation light receiving means for receiving the detection light from the light emitting means that can be attenuated by the substance flowing into the detection space;
Scattered light receiving means for receiving scattered light generated when the detection light from the light emitting means is scattered by the substance flowing into the detection space,
The first detection target detecting means detects the substance based on the scattered light received by the scattered light receiving means,
The second detection target detection means detects the substance based on the detection light received by the dimming light receiving means,
The monitoring area abnormality determination means includes:
a first process of detecting the possibility of an abnormality occurring in the monitoring area based on the detection result of the second detection target detection means;
a second process of comparing the detection result of the first detection target detection means and the detection result of the second detection target detection means when the possibility of an abnormality occurrence in the monitoring area is detected in the first process; and,
performing a third process of determining the occurrence of an abnormality in the monitoring area based on the comparison result in the second process;
The monitoring area abnormality determination means includes:
In the third process,
The possibility of occurrence of an abnormality in the monitoring area detected in the first process is caused by smoke that is a detection target that occurs due to the occurrence of the abnormality, or the monitoring area detected in the first process identify whether the possibility of abnormality occurring is due to steam that is not the detection target,
determining the occurrence of an abnormality in the monitoring area when it is identified that the possibility of the abnormality occurring in the monitoring area detected in the first process is caused by the smoke;
sensor. The monitoring area abnormality determination means includes:
further performing a process of identifying the type of smoke that has occurred due to the occurrence of the abnormality, and identifying the type of the abnormality based on the identification result of the smoke type;
The sensor according to claim 1 .

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