JPH08338760A - Flame detection apparatus - Google Patents

Abstract

PURPOSE: To obtain a flame detection apparatus whose costs are not raised, which can simply deal with change in the radiation ratio of a UV(ultraviolet) amount and an IR(infrared) amount due to the place of the outbreak of a fire and the kind of inflammables and which can detect a flame quickly, without any malfunction and precisely over the whole general fire. CONSTITUTION: The flame detection apparatus is provided with a UV detection part 1, an IR detection part 2 which detects an IR amount due to the resonance radiation of CO2 , and signal processing parts 3, 4 which digitize outputs of the detection parts 1, 2, and by which the outputs are signal-converted into an ON-OFF signal which has cancelled a steady level in the installation environment of a UV radiation source and an IR radiation source and into a digital signal at the steady level or higher. And also, the flame detection apparatus is provided with a comparison and judgment part 7 which outputs an operating signal when a signal is output from an AND part 5 in which ON-OFF signals to be output from the signal processing parts 3, 4 are ANDed and when a digital addition signal to be output from a signal addition part 6 in which the digital signals to be output from the UV and IR signal processing parts 3, 4 are added exceeds a prescribed level, and a timer part 8 which outputs a report signal via an output part 9 when the operating signal from the comparison and judgment part 7 is continued for a definite time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to flame detection for detecting a flame generated by a hydrocarbon fire such as a fire of various machine tools attached with various combustible materials such as lubricating oil or a domestic fire. It relates to the device.

[0002]

2. Description of the Related Art Electromagnetic waves emitted from a flame generated by a hydrocarbon fire contain a wide range of components from ultraviolet rays to far infrared rays. FIG. 5 is a flame spectrum curve in which the horizontal axis represents the wavelength (μm) of the radiated electromagnetic wave and the vertical axis represents the relative intensity (%). As is clear from the figure,
_{3. As} a unique spectrum generated at the time of combustion of hydrocarbon, carbon dioxide gas (CO ₂ ) generated at the time of combustion is generated by resonance radiation.
It is well known that infrared rays having a peak around 3 (μm) exist.

As a flame detecting device that has been generally adopted in the past, a high-sensitivity photoelectric tube is used to emit ultraviolet rays (hereinafter, UV).
Of the infrared rays (hereinafter referred to as IR) in the vicinity of 4.3 (μm) by utilizing the CO ₂ resonance radiation peculiar to the flame as described above. An IR type is known that detects the peak level or a level at multiple points around 4.3 (μm), but the former UV type is extremely sensitive and can detect instantly. On the other hand, it is liable to malfunction due to discharge of various discharge tubes such as lighting fixtures and sparks of welding, and the latter IR type emits IR near 4.3 (μm) emitted from high temperature objects other than flames. May be detected and malfunction may occur. Therefore, in view of the necessity of ensuring the predetermined flame detection without causing malfunctions due to various disturbance elements as described above, the UV type and IR type are suitable for the installation environment of radiation sources other than fire. According to the situation, it is used selectively, and its versatility is very poor.
In addition, in the IR formula, in the multi-wavelength formula in which the levels at a plurality of points around 4.3 (μm) are detected,
Although a predetermined detection function can be exerted even if there is a fluctuation peculiar to the flame, it is necessary to install an optical filter at each of a plurality of points, which is very high in cost and is not practical.

In order to solve the drawbacks of the above-mentioned UV or IR independent detector, both UV and IR are conventionally detected as disclosed in, for example, Japanese Patent Publication No. 3-35720. At the same time, a flame detection device of UV / IR ratio judgment type, which is configured to calculate the ratio of both and judge whether or not the ratio is within a specific range to detect a flame, and further, Japanese Patent Laid-Open No. 3-174699. As disclosed in the publication, both the UV amount and the IR amount are continuously detected for a certain period of time, and when each of the UV amount and the IR amount exceeds a predetermined level fixedly set in advance, UV / IR configured to output a notification signal such as an alarm by determining a flame based on the logical product of two output signals
Type flame detection devices have already been proposed.

[0005]

However, in the conventional UV / IR ratio judgment type flame detection device described above, the UV
Although it is possible to identify combustibles from the change characteristics of the ratio between IR and IR, changes in the conditions of the installation environment, such as when smoke is floating in the air and when it is not, or depending on the type of combustibles, UV and IR If the ratio of and changes significantly, there is a problem of malfunction in that the alarm will be lost even though the flame is actually generated. Also, the latter UV
In the / IR type flame detection device, even though the ratio of the UV amount and the IR amount to be radiated differs depending on the type of combustible substance, each judgment level is fixed, so it can be detected depending on the type of combustible substance. It is difficult to apply it to general-purpose fires in general because the size of different flames will be different. In addition, the UV and IR emitted from the flame and the UV and IR emitted from other radiation sources have an integral function of continuously detecting for a certain period of time to distinguish them from each other. Cannot be obtained, and it is not possible to quickly detect the small flame that is the source of the fire. Furthermore, UV
And as an IR detection sensor, a sensor equipped with a wavelength analyzer such as a spectrum analyzer is used to measure the UV amount and the I
It may be possible to deal with the change in the ratio of the R amount, but in this case, the sensor itself becomes very expensive, and the cost increase of the entire device is inevitable.

The present invention has been made in view of the above circumstances, and a flame detection device capable of detecting a flame quickly and accurately over a general-purpose fire in general, while suppressing an increase in cost. Is intended to provide.

[0007]

In order to achieve the above object, a flame detecting device according to the present invention is provided with UV emitted from a flame.
The UV detector for detecting the amount, the IR detector for detecting the IR amount due to CO ₂ resonance radiation peculiar to the flame, the outputs from the IR detector and the UV detector are digitized, and the IR and UV A signal processing unit that processes an ON / OFF signal that cancels the steady level in the installation environment of the radiation source and a digital signal that is higher than the steady level;
O output from the UV and IR signal processing units
AN that inputs the N / OFF signal and takes the logical product of both signals AN
A D determining section, and a signal adding section for adding digital signals output from the UV and IR signal processing sections,
When a signal is output from the AND determination unit and a digital addition signal output from the signal addition unit exceeds a predetermined level, a comparison determination unit that outputs an operation signal, and a comparison determination unit A timer unit that outputs a notification signal via the output unit when the operation signal continues for a certain period of time is provided.

As the UV detecting section in the flame detecting device, a UV detecting photoelectric tube is used as in claim 2, and U
It is preferable to have a waveform shaping circuit for converting the discharge signal of V into a pulse signal according to the UV amount.

Further, as an IR detecting section in the flame detecting device, an infrared sensor is used as in claim 3, and a filter and an AC amplifying circuit for selecting and amplifying a frequency band of fluctuation are provided. It is preferable that the analog signal obtained by rectifying and smoothing the output from is digitized in the signal processing unit.

Further, a thermocouple type sensor is used as an IR detecting section in the flame detecting device, and a DC amplifying circuit for amplifying a DC infrared component detected by the thermocouple type sensor and a change are provided. It is preferable that the amount detection circuit is provided and the analog signal output from the change amount detection circuit is converted into a digital signal, and the digital signal is further input to the signal addition unit.

[0011]

According to the present invention, the UV amount radiated from the flame generated by the fire and the IR amount due to the CO ₂ resonance radiation are simultaneously detected by both detectors, and the detected signals are input to the signal processor, where The signal processing is performed on the ON / OFF signal of which the steady level is canceled in the installation environment and the digital signal of the steady level or higher. ON / OFF signals output from these UV and IR signal processing units are AN
When a logical product is obtained in the D determination unit and both output signals are ON signals, a coincidence signal is output from the AND determination unit, and both digital signals are added in the signal addition unit to obtain the digital addition signal. Is output.
Then, when the coincidence signal is input to the comparison determination unit and when the digital addition signal exceeds a predetermined level, an operation signal is output and input to the timer unit, and this operation signal continues for a fixed time. Only when this is done, the notification signal is output.

As described above, UV and IR are simultaneously detected, and the flame is detected by comparing the added value of the converted digital signals with a predetermined level. Therefore, depending on the size of the flame and the type of combustible substance causing the flame. UV dose and I
No matter how the ratio of R changes, it is possible to detect the flame reliably and quickly in the small flame stage, and at this time, the ON / OFF signal that cancels the steady level in the installation environment. Since the logical product of is used as the judgment condition, it is possible to prevent the occurrence of malfunctions due to changes in the environment of the radiation source installation, and it is possible to cancel the transient signal with the timer part, so that it can be used for general-purpose fires in general. Accurate and rapid flame detection can be performed without causing a false alarm. Further, by digitizing the analog signals detected by the UV detection unit and the IR detection unit, the CPU can be used for the arithmetic processing operation in the signal addition unit and the comparison determination unit.
It is possible to have general versatility by using, and the calculation processing that adapts to various conditions such as changes in the radiation ratio of UV amount and IR amount depending on the place of fire and the type of combustible material is troublesome, such as circuit change, and expensive. It can be easily realized by only changing the software without using any means.

Here, in particular, as in the second aspect, the UV detection photoelectric tube is used as the UV detection section, and the discharge signal by UV is pulse-converted by the waveform shaping circuit, so that the subsequent signal processing is facilitated. Become. Further, as the IR detecting section, a pyroelectric type or thermocouple type sensor is used as in claim 3, and a filter and an AC amplifying circuit for selecting and amplifying a frequency band of fluctuation are provided, and the IR detecting section If the signal processing unit is configured to digitize an analog signal whose output is rectified and smoothed, it will ensure a certain IR detection regardless of the peculiar fluctuation called the breathing action of the flame, which is a problem in the case of a small flame. Can be

A thermocouple type sensor is used as an IR detecting section in the flame detecting device.
It is equipped with a DC amplification circuit that amplifies the DC infrared component detected by this thermocouple type sensor and a change amount detection circuit, and also converts the analog signal output from this change amount detection circuit into a digital signal, and the digital signal When inputting to the above-mentioned signal addition section, it is possible to reliably detect an IR that suddenly increases in addition to fluctuations and becomes a large flame at the same time as ignition, and the amount of change is converted into a digital signal. Then, by using it as a judgment element for flame detection, it is possible not only to have versatility but also to shorten the time required for flame detection.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a flame detection device according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a more detailed configuration of the flame detection device shown in FIG.

As shown in FIG. 1, the flame detecting apparatus according to one embodiment of the present invention is roughly classified into a UV detector 1 for detecting a UV amount and an IR amount due to CO ₂ resonance radiation peculiar to the flame. IR detection unit 2, signal processing units 3 and 4 provided corresponding to both detection units 1 and 2, and UV and IR
AND determination unit 5 that obtains the logical product of ON / OFF signals output from the signal processing units 3 and 4 of FIG.
A signal adder 6 for adding the adjustment signals output from
A comparison determination unit 7 that outputs an operation signal when the coincidence signal is output from the AND determination unit 5 and the addition signal output from the signal addition unit 6 exceeds a predetermined level; When the operation signal output from the comparison / determination unit 7 continues for a certain time, a timer unit 8 that outputs a start signal, and an alarm device (not shown) is notified based on the input of the start signal output from the timer unit 8. The output unit 9 outputs a signal.

The details of each component of the flame detecting device having the above-described schematic configuration will be described with reference to FIG. 2. As the UV detector 1, a UV detecting photoelectric tube (hereinafter referred to as a UV sensor) 10 is used. Used, this UV sensor 10
UV of 5 to 260 (nm) is detected as a discharge signal and passed through the waveform shaping circuit 13 to be converted into a pulse signal. This pulse signal is the energy emitted from the flame, namely U
When the UV amount is small, the pulse interval is long according to the V amount, and when the UV amount is large, the pulse interval is short.

The IR detector 2 uses a thermocouple type (thermopile) sensor (hereinafter referred to as an IR sensor) 14 provided with a CO ₂ optical filter 15, and the IR sensor 14 emits CO ₂ resonance radiation. 1 to 4.5 (μ
m) IR temperature is detected, and the temperature sensor 16 detects a micro flame together with a steady radiation level that compensates for an error component due to ambient temperature. Therefore, an AC component (1 to 1) due to flame fluctuation is detected.
15 Hz) is selectively separated and amplified by the AC amplifier 18.
Here, since a large flame may be generated at the same time as ignition and IR other than fluctuations may increase rapidly, a DC IR component other than fluctuations is amplified by a DC amplifier 17, and this is composed of a memory circuit 27 and an analog storage circuit. Is input to the change amount detection circuit 19 and the change amount per unit time at a steady level other than fluctuation is detected as an analog signal, and the signal processing unit 39 of the change amount of the DC IR component outputs the analog signal. V-F conversion circuit 36 for converting into a digital signal
3, a counter circuit 37 that counts the converted digital signal, and a latch circuit 38 that latches the count number for each oscillation period, and is a change amount of the DC IR component in FIG. The digital signal as shown in (1) is input from the signal processing unit 39 to the signal adding unit 6.

The UV signal processing unit 3 outputs one cycle of the constant period signal output from the oscillation circuit 29 of the pulse signal from the waveform shaping circuit 13 of the UV detection unit 1 as shown in FIG. 3B. The counter circuit 20 that counts the pulse signal that has entered the interval, the latch circuit 21 that latches the count number for each oscillation cycle, and the level setting circuit 23 that is set in advance to cancel the noise component of the latched count number. Comparing circuit 2 for comparing with the set value SL1
2 and a signal including a steady count number including noise is input, the level is adjusted to match the IR side and a digital signal as shown in FIG. The circuit 22 outputs an ON / OFF signal as shown in FIG.

The IR signal processing section 4 converts the AC signal from the IR detecting section 2 into a rectified and smoothed DC (pulsating) analog voltage, and a digitalized analog DC voltage obtained by the conversion. A VF conversion circuit 31 for converting into a signal, and a digital signal output from the oscillating circuit 29 among the converted digital signals, which is included in one cycle of a constant cycle signal as shown in FIG. 3B. A counter circuit 32 that counts the number of counts, a latch circuit 33 that latches the count number for each oscillation cycle, and a set value SL2 that is set in advance in the level setting circuit 35 to cancel the noise amount of the latched count number. 3 which has a comparison circuit 34 which is controlled and whose level is adjusted so as to match the UV side when a signal including a steady count number including noise is input. Outputs the digital signal as shown in) from the comparison circuit 34 outputs the ON · OFF signal as shown in (f) of FIG.

The AND judgment section 5 is arranged so that the UV and I
An AND circuit 24 that inputs the ON / OFF signals output from the comparison circuits 22 and 34 of the R signal processing units 3 and 4 to take the logical product of both ON / OFF signals and an OR that takes the logical sum of both ON / OFF signals A circuit 25, and the above UV and IR
When the signals output from the comparison circuits 22 and 34 of both signal processing units 3 and 4 are ON signals, the AND circuit 2
4 outputs a coincidence signal, which is input to the comparison / determination unit 7. Also, both the UV and IR signal processing units 3,
When only one of the signals output from the comparator circuits 22 and 34 of No. 4 is an ON signal, an OR signal is output from the OR circuit 25 and the OR signal is input to the memory circuit 27 to enter the reset state. A certain memory circuit 27 is set.

The signal addition section 6 and the comparison / determination section 7 are
The addition / determination circuit 26 is integrally configured and is output from the UV signal processing unit 3, the IR signal processing unit 4, and the DC IR component change amount signal processing unit 39, respectively.
3 (c), (e) and (g) are added to output a digital addition signal as shown in FIG. 3 (h), and the digital addition signal is preset. When the predetermined judgment value SL3 is exceeded and the coincidence signal is input from the AND circuit 24 of the AND judgment unit 5, the operation signal as shown in (i) of FIG. 3 is output.

The timer section 8 is composed of a timer circuit, and the operation signal from the addition / determination circuit 26 (comparison and determination section 7) is set at a preset constant time t1 as shown in (j) of FIG. When it is continued for a long time, an ON signal is given to an alarm device (not shown) through an output terminal that constitutes the output unit 9.

Next, the operation of the flame detecting device constructed as described above will be briefly described with reference to the flow chart shown in FIG. When a flame is generated due to the occurrence of a hydrocarbon fire, UV and IR are radiated from the flame in a spectral distribution as shown in FIG. 5, UV is incident on the UV sensor 10, and 4.1 to CO ₂ resonance radiation is generated. 4.5 (μ
m) IR passes through the optical filter 15 and the IR sensor 14
Is incident on and UV and IR are simultaneously detected (steps S1 and S2). Among them, UV is the waveform shaping circuit 1
3 is converted into a pulse signal as shown in FIG. 3B, and then input to the counter circuit 20 to output a digital signal x as shown in FIG. 3C (step S3). ~ S4).

In parallel with this, the IR detected by the IR sensor 14 has a constant radiation level compensated for the ambient temperature by the temperature sensor 16 and an AC component (1 to 15 Hz) due to the fluctuation of the flame for detecting a micro flame. AC amplifier 1
After being amplified by 8, it is passed through a rectifying / smoothing circuit 30, rectified and smoothed, output as an analog voltage of a DC level, and level-adjusted to match the UV side,
Then, after being converted into a digital signal by the V-F conversion circuit 31, the digital signal is input to the counter circuit 32 and a decimal signal y as shown in (e) of FIG. 3 is output (steps S6 to S6).
S8, S16, S17). Further, a DC IR component other than fluctuations, which rapidly increases due to a large flame upon ignition, is amplified by the DC amplifier 17, and then input to the memory circuit 27 and the change amount detection circuit 19 (steps S9 to S1).
0).

The digital signals x and y are then
The set values S1 are input to the comparison circuits 22 and 34, respectively.
And S2, and when x exceeds S1 and when y exceeds S2, ON signals x1 and y1 are output, and these ON signals x1 and y1 are input to the AND circuit 24, A coincidence signal is output by taking the logical product of them, and the comparison circuit 22
When the ON signal x1 or y1 is output from only one of the above and 34, the OR circuit 25 takes the logical sum to output a logical sum signal, which is input to the memory circuit 27 and the direct current IR at that time is output. The component is the memory circuit 27
The change amount between the set DC IR component and the DC IR component other than the fluctuation at the time of ignition is detected by the change amount detection circuit 19, and the change amount signal is digital signal by the VF conversion circuit 36. Counter circuit 37 after being converted to
Is input to the digital signal z as shown in FIG.
Is output (steps S11 to S15, S18, S1
9).

Next, the digital signal x output from the latch circuit 21 of the UV signal processing unit 3 as shown in FIG. 3C and the output of the latch circuit 33 of the IR signal processing unit 4 shown in FIG. The digital y as shown in (e) and the direct current I output from the latch circuit 38 of the signal processing unit 39.
A digital signal z as shown in (g) of FIG. 3 as the amount of change of the R component is input to the addition / determination circuit 26, and these signals x, y, z are added in the signal addition unit 6, and The comparison / determination unit 7 determines whether or not the digital addition signal exceeds a preset predetermined determination value SL3, and if it exceeds the predetermined determination value SL3, an operation signal as shown in (i) of FIG. 3 is output. This is input to the timer unit 8 including a timer circuit. In this timer unit 8,
As shown in (j) of FIG. 3, it is determined whether the operation signal output from the addition / determination circuit 26 (comparison determination unit 7) continues for a preset constant time t1. , If it exceeds, through the output terminal (output unit 9),
An alarm device (not shown) is notified and the alarm device is activated to output an alarm (steps S20 to S23).

As described above, UV and IR are detected at the same time, the added value of the converted digital signals x and y is compared with a predetermined judgment value SL3, and the flame is judged and outputted. No matter how the ratio of the amount of UV and the amount of IR radiated changes depending on the size and the type of combustible material that causes it, a small flame that can cause a fire of various combustible materials can be reliably ensured.
And it is possible to quickly detect and output an alarm,
At this time, since the logical product of the ON / OFF signals in which the noise of the steady count number in the installation environment is canceled is used as the determination condition, no malfunction occurs due to the change of the installation environment of the radiation source, and the timer unit Since it is possible to cancel the transient signal at 8, it is possible to accurately and promptly detect a predetermined flame without causing a false alarm over all general-purpose fires.

In addition, in the structure of the above embodiment, UV,
The fire detection function can be further enhanced by adding a function of outputting an attention signal instead of an alarm output when IR fluctuation and IR steady radiation are individually detected.

[0030]

As described above, according to the present invention, UV and IR radiated from a flame are simultaneously detected, and the added value of UV and IR and a predetermined value are obtained by signal processing using a characteristic peculiar to the flame as a judgment condition. Since the flame is detected by comparing with U, U emitted depending on the size of the flame and the type of combustible material that causes it
No matter how the ratio between the amount of V and the amount of IR changes, the flame can be detected reliably and quickly at the stage of a small flame. In addition, since the logical product of ON / OFF signals that cancel the steady level in the installation environment is used as the judgment condition, it is possible to prevent malfunctions due to changes in the installation environment of the radiation source, and to cancel the transient signal in the timer section. Therefore, it is possible to perform appropriate and prompt flame detection without being restricted by the fire of a specific combustible material and without causing a false alarm over general-purpose fires. In addition, by digitizing the analog signals detected by the UV detection section and the IR detection section, it is possible to use the CPU for the arithmetic processing operation in the signal addition section and the comparison / determination section so as to provide versatility. U depending on fire location and type of combustible material
It is said that the arithmetic processing adapted to various conditions such as the change of the radiation ratio of the V amount and the IR amount can be easily realized by only changing the software without using troublesome and expensive means such as circuit change. Produce an effect.

According to a second aspect of the present invention, a highly sensitive UV detection photoelectric tube is used as the UV detection unit, and a UV discharge signal is converted into a pulse waveform signal by a waveform shaping circuit. Detection accuracy can be improved and subsequent signal processing can be facilitated. Further, as described in claim 3, an infrared sensor is used as an IR detection unit, and a frequency band of fluctuation is selected and amplified. By having a filter and an AC amplification circuit that perform the rectification and smoothing of the output from the IR detection section, the analog signal is digitized in the signal processing section.
Even in the case of a small flame, it is possible to catch the peculiar fluctuation called the breathing action of the flame and ensure the predetermined IR detection.

Further, as in claim 4, a thermocouple type sensor is used as an IR detecting section in the flame detecting device, and a direct current amplifying circuit for amplifying a direct current infrared component detected by the thermocouple type sensor and a change. When a quantity detection circuit is provided and the analog signal output from this change amount detection circuit is converted to a digital signal and the digital signal is input to the signal addition section, a large flame is generated at the same time as ignition. And I will increase rapidly in addition to fluctuations.
R can be detected reliably, and by converting the amount of change into a digital signal and using it as a judgment element for flame detection, it is possible to have versatility and the time required for flame detection. Can be further shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a flame detection device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a more detailed configuration of the flame detection device shown in FIG.

FIG. 3 is a signal waveform diagram of each part at the time of flame detection operation.

FIG. 4 is a flowchart illustrating a flame detection operation.

FIG. 5 is a characteristic diagram showing a flame spectrum curve in which the horizontal axis represents the wavelength of radiated electromagnetic waves and the vertical axis represents relative intensity.

[Explanation of symbols]

 1 UV detection unit 2 IR detection unit 3, 4, 39 Signal processing unit 5 AND determination unit 6 Signal addition unit 7 Comparison determination unit 8 Timer unit (timer circuit) 9 Output unit 10 UV sensor 13 Waveform shaping circuit 14 IR sensor 15 Optical Filter 17 DC amplification circuit 18 AC amplification circuit 19 Change amount detection circuit 24 AND circuit 26 Addition / judgment circuit 31 V-F conversion circuit

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Masaki Kobayashi 2-10-10 Fukaekita, Higashinari-ku, Osaka City, Osaka Prefecture Yamato Protech Co., Ltd.

Claims (4)

[Claims] 1. A flame detection device for detecting ultraviolet rays and infrared rays emitted from a flame; an ultraviolet ray detecting portion for detecting an ultraviolet ray amount; and an infrared ray detecting portion for detecting an infrared ray amount due to CO ₂ resonance radiation peculiar to a flame. The output from the infrared detector and the ultraviolet detector is digitized, and the steady level in the installation environment of the ultraviolet and infrared radiation sources is canceled.
A signal processing unit that processes an OFF signal and a digital signal of a steady level or higher, and an AND determination unit that inputs the ON / OFF signals output from the signal processing units of the ultraviolet ray and the infrared ray and takes a logical product of both signals, The signal addition unit that adds the digital signals output from the signal processing units for the ultraviolet rays and the infrared rays, and the digital addition signal that is output from the signal addition unit when the signals are output from the AND determination unit A comparison determination unit that outputs an operation signal when the level exceeds a predetermined level, and a timer unit that outputs a notification signal via the output unit when the operation signal from the comparison determination unit continues for a certain time. Characteristic flame detection device. 2. The flame detection device according to claim 1, wherein the ultraviolet ray detecting section uses an ultraviolet ray detecting photoelectric tube and has a waveform shaping circuit for converting a discharge signal due to the ultraviolet ray into a pulse signal according to the amount of the ultraviolet ray. . 3. An infrared sensor is used as the infrared detecting section, and a filter for selecting and amplifying a frequency band of fluctuation and an AC amplifying circuit are provided, and an analog signal obtained by rectifying and smoothing an output from the infrared detecting section is provided. The flame detection device according to claim 1, wherein the signal processing unit is configured to be digitized. 4. A thermocouple type sensor is used as the infrared detecting section, and a direct current amplifier circuit for amplifying a direct current infrared ray component detected by the thermocouple type sensor and a change amount detection circuit are provided, and this change is also provided. The flame detection device according to claim 1, wherein an analog signal output from the quantity detection circuit is converted into a digital signal, and the digital signal is input to the signal addition section.