CN117686398B - Civil aircraft cargo hold smog concentration detecting system based on polarized light - Google Patents
Civil aircraft cargo hold smog concentration detecting system based on polarized light Download PDFInfo
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- CN117686398B CN117686398B CN202311609066.6A CN202311609066A CN117686398B CN 117686398 B CN117686398 B CN 117686398B CN 202311609066 A CN202311609066 A CN 202311609066A CN 117686398 B CN117686398 B CN 117686398B
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- 239000000779 smoke Substances 0.000 claims abstract description 79
- 238000012545 processing Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 40
- 230000003321 amplification Effects 0.000 claims abstract description 37
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 13
- 230000005855 radiation Effects 0.000 claims 1
- 230000010287 polarization Effects 0.000 description 14
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/21—Polarisation-affecting properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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Abstract
本发明公开了一种基于偏振光的民机货舱烟雾浓度探测系统。包括可调发光模块、可调偏振收光模块、逻辑控制与数据处理模块；可调发光模块用于输出强度可变的红外或蓝光的光信号，经过烟雾粒子散射后，进入可调偏振收光模块；可调偏振收光模块，用于将光信号转化为电信号后，输入逻辑控制与数据处理模块；输入逻辑控制与数据处理模块，用于对电信号进行数据处理，以判断烟雾和干扰，同时根据可调偏振收光模块信号强度进行放大倍数的调节。本发明探测浓度范围宽，探测浓度连续性好，调节精度高，报警可靠。
The present invention discloses a smoke concentration detection system for a cargo hold of a civil aircraft based on polarized light. It includes an adjustable light emitting module, an adjustable polarized light receiving module, and a logic control and data processing module; the adjustable light emitting module is used to output infrared or blue light signals with variable intensity, which enter the adjustable polarized light receiving module after being scattered by smoke particles; the adjustable polarized light receiving module is used to convert the light signal into an electrical signal and then input it into the logic control and data processing module; the input logic control and data processing module is used to perform data processing on the electrical signal to judge smoke and interference, and at the same time adjust the amplification factor according to the signal intensity of the adjustable polarized light receiving module. The present invention has a wide detection concentration range, good detection concentration continuity, high adjustment accuracy, and reliable alarm.
Description
Technical Field
The invention belongs to the technical field of civil aircraft measurement and control, and particularly relates to a smoke concentration detection system of a cargo hold of a civil aircraft based on polarized light.
Background
The fire disaster high false alarm rate problem of the aircraft cargo hold seriously affects the civil aviation flight safety, at present, the infrared and blue light signal intensities are collected by the red and blue light dual-wavelength photoelectric smoke detector respectively to carry out double-parameter fitting fire disaster detection, interference particles are identified, and the false alarm rate of a system is greatly reduced, but the smoke concentration range detected by the red and blue light dual-wavelength photoelectric smoke detector is generally 80% -100%/ft (light transmittance), the detection range is narrower, the cargo hold environment is complex, the types of stored cargoes are multiple, the smoke concentration is high in a high-altitude low-pressure sealing environment fire disaster, when the interior of the smoke detector is polluted or large-scale fire disaster high-concentration smoke occurs, the high-concentration smoke is easy to saturate the smoke detector, at this time, the red and blue light dual-wavelength photoelectric smoke detector enters a single-wavelength working mode, and the system loses the interference particle identification capability, so that the false alarm rate of the smoke concentration detection system is improved.
Disclosure of Invention
The invention aims to provide a smoke concentration detection system for a civil aircraft cargo compartment based on polarized light. The invention has wide concentration detection range, good concentration detection continuity, high adjustment precision and reliable alarm.
The technical scheme is that the anti-false alarm system of the civil aircraft cargo space smoke detector comprises an adjustable light emitting module, an adjustable polarization light receiving module and a logic control and data processing module, wherein the adjustable light emitting module is used for outputting infrared or blue light signals with variable intensity, the infrared or blue light signals enter the adjustable polarization light receiving module after being scattered by smoke particles, the adjustable polarization light receiving module is used for converting the light signals into electric signals and inputting the electric signals into the logic control and data processing module, and the logic control and data processing module is used for carrying out data processing on the electric signals to judge smoke and interference and adjusting the amplification factor according to the signal intensity of the adjustable polarization light receiving module.
In the polarized light-based civil aircraft cargo space smoke concentration detection system, the adjustable polarized light receiving module comprises a photoelectric tube L3 for receiving light, the output end of the photoelectric tube L3 is connected with the signal positive input end of an amplifier A1, the output end of the amplifier A1 is connected with a logic control and data processing module, the output end of the amplifier A1 is also connected with the signal positive input end of an amplifier A2, an adjustable resistor R1 is connected between the signal negative input end and the output end of the amplifier A2, the adjustable resistor R1 is also connected with a logic control and data processing module, the output end of the amplifier A2 is also connected with the signal positive input end of the amplifier A3, the signal negative input end and the output end of the amplifier A3 are also connected with an adjustable resistor R2, the adjustable resistor R2 is also connected with the logic control and data processing module, and the output end of the amplifier A3 is also connected with the logic control and data processing module.
In the polarized light-based civil aircraft cargo space smoke concentration detection system, the adjustable light-emitting module comprises an infrared adjusting unit T1, a blue light adjusting unit T2, an infrared LED luminous tube L1 and a blue LED luminous tube L2, wherein the input end of the infrared adjusting unit T1 is connected with the logic control and data processing module, the output end of the infrared adjusting unit T1 is connected with the infrared LED luminous tube L1, the input end of the blue light adjusting unit T2 is connected with the logic control and data processing module, and the output end of the blue light adjusting unit T2 is connected with the blue LED luminous tube L2.
In the above-mentioned civil aircraft cargo space smoke concentration detection system based on polarized light, the light emitting brightness of the infrared LED light emitting tube L1 and the blue LED light emitting tube L2 can be adjusted.
In the foregoing polarized light-based civil aircraft cargo space smoke concentration detection system, the infrared adjusting unit T1 and the blue light adjusting unit T2 are digital chips, and are respectively used for adjusting the luminous intensities of the infrared LED luminous tube L1 and the blue LED luminous tube L2.
In the foregoing smoke concentration detection system of the cargo compartment of the civil aircraft based on polarized light, the logic control and data processing module comprises a central processing unit U1, input signals of the U1 comprise feedback signals 1, feedback signals 2 and feedback signals 3 respectively from output ends of amplifiers A1, A2 and A3, and output signals of the U1 comprise control signals 1, control signals 2, control signals 3 and control signals 4 respectively controlling R1, R2, T1 and T2.
In the above smoke concentration detection system of the civil aircraft cargo hold based on polarized light, L3 is a photoelectric tube with a polarizer.
In the civil aircraft cargo space smoke concentration detection system based on polarized light, the amplification factors of A2 and A3 are adjusted through the corresponding adjustable resistors R1 and R2.
In the civil aircraft cargo space smoke concentration detection system based on polarized light, the amplification factors of A2 and A3 are adjusted by digital chips, the amplification factor adjusting range of A2 is an integer multiple of 2 in 1-100, and the amplification factor adjusting range of A3 is 1.0-9.9.
In the foregoing smoke concentration detection system for the cargo compartment of the civil aircraft based on polarized light, the amplifier A1 disposed behind the light receiving pipe L3 is a radio-frequency circuit.
Compared with the prior art, the invention relates to a polarized light-based civil aircraft cargo hold smoke concentration detection system, which belongs to the technical field of aircraft fire prevention, and is suitable for collecting and processing fire smoke signals by arranging an adjustable light-emitting module, an adjustable polarized light-receiving module and a logic control and data processing module and realizing the full-range detection of the smoke concentration under a polarized state. The method has the advantages of wide concentration detection range, good concentration detection continuity, high adjustment precision and reliable alarm;
According to the invention, the infrared and blue light dual-light source is adopted to irradiate smoke and interference particles, the polarized light receiving module is used for carrying out optical signal conversion, the smoke concentration is collected, the infrared and blue light smoke concentration increment is calculated respectively, the change trend of the concentration increment and the increment ratio is found in time, the smoke particles and the interference particles output different signals, the system has high particle size and shape identification degree, and the alarm accuracy is high;
The system aims at the situation that the background value of the system detection caused by the pollution of the maze in the detector is increased, and the system can automatically adjust the intensity of the light-emitting module in real time according to the background value change, so that the background value increase caused by the pollution is reduced, and the false alarm caused by the background value being larger than the set smoke concentration alarm threshold value is avoided;
The system aims at the condition that the background value of the system detection caused by the pollution of the maze in the detector is increased, the system can automatically adjust the intensity of the light-emitting module in real time according to the background value change, the background value increase caused by the pollution is reduced, the background value can still be kept in a normal use range, the smoke detector can be continuously used, the periodic maintenance period of the detector is shortened, and the maintenance interval period is prolonged to more than 5 years from 1 year;
The invention relates to a dual-wavelength infrared photoelectric smoke detector, which is characterized in that the smoke concentration range detected by the traditional dual-wavelength infrared photoelectric smoke detector is generally 80% -100%/ft (light transmittance), when the smoke concentration exceeds 80% -100%/ft, the infrared or blue light smoke collection intensity is saturated, a single-wavelength (infrared or blue light) working mode is formed, the system loses the function of distinguishing smoke and interfering particles, false alarm is caused, and aiming at different smoke concentrations, particularly the detector is easy to saturate under high-concentration smoke, the collection range of the smoke concentration is widened by the light receiving and emitting module, the full-range continuous smoke detection between 0% -100%/ft is realized, the system is always kept in the dual-wavelength infrared detection mode, the false alarm caused by saturation is avoided, and the false alarm rate of the system is reduced from not more than 5% to not more than 2%;
According to the invention, the digital chip is adopted to adjust the luminous intensity and the amplification factor of the collecting amplifier of the light receiving module, so that the amplification factor can be automatically adjusted, and compared with a method for adjusting the amplification factor by switching a fixed value resistor (the fixed value amplification factor is set by welding different resistors when leaving a factory), the smoke concentration collecting range can be automatically adjusted, and the real-time performance is good;
The invention adopts the digital chip to control the amplification factor of the collecting amplifier of the light receiving module, can realize the continuous adjustment of the amplification factor within 0-1000 times, and has good continuity and high smoke detection concentration collecting precision.
Drawings
FIG. 1 is a block diagram of the system components of the present invention;
FIG. 2 is a schematic diagram of a system of the present invention;
FIG. 3 illustrates an infrared light emitting and receiving module adjustment method under polarized conditions according to the present invention;
fig. 4 is a diagram showing a method for adjusting a blue light emitting and receiving module under the polarization condition of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
Example 1. Referring to fig. 1 and 2, the smoke concentration detection system of the cargo hold of the civil aircraft based on polarized light comprises an adjustable light emitting module, an adjustable polarized light receiving module and a logic control and data processing module, wherein the adjustable light emitting module is used for outputting infrared or blue light signals with variable intensity, the infrared or blue light signals enter the adjustable polarized light receiving module after being scattered by smoke particles, the adjustable polarized light receiving module is used for converting the light signals into electric signals and inputting the electric signals into the logic control and data processing module, and the logic control and data processing module is used for carrying out data processing on the electric signals to judge smoke and interference and adjusting the amplification factor according to the signal intensity of the adjustable polarized light receiving module.
The adjustable polarization light receiving module comprises a light receiving tube L3, an amplifier A1, an amplifier A2 and an amplifier A3, wherein the output end of the light receiving tube L3 is connected with the signal positive input end of the amplifier A1, the output end of the amplifier A1 is connected with the logic control and data processing module, the output end of the amplifier A1 is also connected with the signal positive input end of the amplifier A2, an adjustable resistor R1 is connected between the signal negative input end of the amplifier A2 and the output end, the adjustable resistor R1 is also connected with the logic control and data processing module, the output end of the amplifier A2 is connected with the output end logic control and data processing module, the output end of the amplifier A2 is also connected with the signal positive input end of the amplifier A3, the adjustable resistor R2 is also connected with the logic control and data processing module, and the output end of the amplifier A3 is also connected with the logic control and data processing module.
The adjustable light-emitting module comprises an infrared adjusting unit T1, a blue light adjusting unit T2, an infrared light-emitting tube L1 and a blue light-emitting tube L2, wherein the input end of the infrared adjusting unit T1 is connected with the logic control and data processing module, the output end of the infrared adjusting unit T1 is connected with the infrared light-emitting tube L1, the input end of the blue light adjusting unit T2 is connected with the logic control and data processing module, and the output end of the blue light adjusting unit T2 is connected with the blue light-emitting tube L2.
The logic control and data processing module comprises a central processing unit U1, wherein the input signals of the U1 comprise feedback signals 1, 2 and 3 respectively from the output ends of the amplifiers A1, A2 and A3, and the output signals of the U1 comprise control signals 1, 2, T1 and T2 respectively controlled by R1, R2, T1 and T2, and control signals 2,3 and 4.
The adjustable polarization light receiving module is used for realizing parameter acquisition of light signals scattered by smoke and interference particles in a polarization state through a photoelectric tube L3, wherein L3 is the photoelectric tube with a polaroid.
The amplification factors of the adjustable polarization light receiving modules A2 and A3 can be adjusted through corresponding adjustable resistors R1 and R2, the amplification factors of the A2 and A3 are adjusted through digital chips, the amplification factor adjusting range of the A2 is an integer multiple of 2 in 1-100, and the amplification factor adjusting range of the A3 is 1.0-9.9.
The amplifier A1 arranged behind the light receiving tube L3 of the polarization-adjustable light receiving module is a radio-frequency circuit, so that signal isolation is carried out, and the amplification precision of the later stage is ensured.
The luminous tube of the adjustable polarization luminous module is an LED type, wherein, L1 wavelength is 900-1000 nm, L2 the wavelength is 400-500 nm.
Referring to FIG. 3, the full-range smoke concentration detection method realized by adjusting the infrared light emitting and receiving module under the polarization condition comprises the steps of powering on a product, enabling the infrared LED to emit light, enabling the polarized light receiving module to collect a background concentration value of a detector, enabling the luminous intensity to be adjusted when the background concentration value is larger than a preset threshold value, enabling the U1 to output a control signal 3 to conduct intensity adjustment on the infrared luminous signal to reduce luminous intensity, enabling the normal infrared smoke concentration to collect the smoke when the background concentration value is not larger than the preset threshold value, enabling the smoke concentration to be input to the U1 through a feedback signal 1, enabling the U1 to conduct data calculation and saturation value comparison, enabling the algorithm to output the control signal 1 to enable the first-stage operational amplification adjustment when the collected smoke concentration is saturated, enabling the algorithm to output the control signal 2 to enable the second-stage operational amplification adjustment when the collected concentration is still saturated, enabling the algorithm to conduct data calculation and saturation value comparison when the collected concentration is still saturated, and enabling the luminous intensity to be adjusted again when the collected concentration is still saturated.
Referring to fig. 4, the full-range smoke concentration detection method realized by adjusting the blue light emitting and receiving module under the polarization condition comprises the steps of powering on a product, enabling the blue light LED to emit light, enabling the polarization-adjustable receiving module to collect a background concentration value of a detector, enabling the U1 to output a control signal 4 to conduct intensity adjustment on a blue light emitting signal to reduce the luminous intensity when the background concentration value is larger than a preset threshold value, enabling the normal blue light smoke concentration to collect the smoke concentration when the background concentration value is not larger than the preset threshold value, enabling the smoke concentration to be input to the U1 through a feedback signal 1, enabling the U1 to conduct data calculation and saturation value comparison, enabling the algorithm to output the control signal 1 to enable the first-stage operational amplification adjustment when the collected smoke concentration is saturated, enabling the algorithm to output the control signal 2 to enable the second-stage operational amplification adjustment when the collected concentration is still saturated, enabling the algorithm to enable the second-stage operational amplification adjustment when the collected concentration is still saturated through a feedback signal 3.
The civil aircraft smoke concentration detection system based on polarized light, the adjustment methods of fig. 3 and 4 are carried out simultaneously, meanwhile, the effective data of infrared and blue light dual-wavelength smoke concentration increment and increment ratio are ensured, the system is unsaturated, and the full-range concentration detection of the system is realized.
Compared with the prior art, the invention adopts the adjustable light emitting module and the adjustable light receiving module, and adopts the digital adjusting circuit to automatically and continuously adjust according to the background value or the smoke concentration change, thereby realizing the real-time controllability of the smoke concentration detection range and having strong detector adaptability. The invention has the advantages of high reliability, automatic continuous intensity adjustment of the luminous intensity of the luminous module according to the needs, convenience, flexibility and wide adjustment range, the amplification factor adjustment of the electric signal acquired by the light receiving module by adopting a digital circuit, continuous automatic adjustment according to the needs, wide adjustment range and high adjustment precision compared with the traditional fixed amplification factor or the adjustment amplification factor of a fixed switching gear by adopting an analog circuit, and the intelligent and efficient control method and high alarm accuracy.
Example 2. A smoke concentration detection system of a cargo hold of a civil aircraft based on polarized light comprises an adjustable light emitting module, an adjustable polarized light receiving module and a logic control and data processing module, wherein the adjustable light emitting module is used for outputting infrared or blue light signals with variable intensity, the infrared or blue light signals enter the adjustable polarized light receiving module after being scattered by smoke particles, the adjustable polarized light receiving module is used for converting the light signals into electric signals and inputting the electric signals into the logic control and data processing module, and the logic control and data processing module is used for carrying out data processing on the electric signals so as to judge smoke and interference and simultaneously adjusting the amplification factor according to the signal intensity of the adjustable polarized light receiving module.
The adjustable polarization light receiving module comprises a photoelectric tube L3 for receiving light, wherein the output end of the photoelectric tube L3 is connected with the signal positive input end of an amplifier A1, the output end of the amplifier A1 is connected with a logic control and data processing module, the output end of the amplifier A1 is also connected with the signal positive input end of an amplifier A2, an adjustable resistor R1 is connected between the signal negative input end and the output end of the amplifier A2, the adjustable resistor R1 is also connected with a logic control and data processing module, the output end of the amplifier A2 is connected with the output end logic control and data processing module, the output end of the amplifier A2 is also connected with the signal positive input end of the amplifier A3, the adjustable resistor R2 is also connected with the logic control and data processing module, and the output end of the amplifier A3 is also connected with the logic control and data processing module.
The adjustable light-emitting module comprises an infrared adjusting unit T1, a blue light adjusting unit T2, an infrared LED light-emitting tube L1 and a blue LED light-emitting tube L2, wherein the input end of the infrared adjusting unit T1 is connected with the logic control and data processing module, the output end of the infrared adjusting unit T1 is connected with the infrared LED light-emitting tube L1, the input end of the blue light adjusting unit T2 is connected with the logic control and data processing module, and the output end of the blue LED light-emitting tube L2 is connected.
The luminous tube of the adjustable polarization luminous module is an LED type, wherein, L1 wavelength is 900-1000 nm, L2 the wavelength is 400-500 nm.
The light-emitting brightness of the infrared LED light-emitting tube L1 and the blue LED light-emitting tube L2 can be adjusted.
The infrared adjusting unit T1 and the blue adjusting unit T2 are digital chips, and are respectively used for adjusting the luminous intensity of the infrared LED luminous tube L1 and the blue LED luminous tube L2.
The logic control and data processing module comprises a central processing unit U1, wherein the input signals of the U1 comprise feedback signals 1, 2 and 3 from the output ends of the amplifiers A1, A2 and A3 respectively, and the output signals of the U1 comprise control signals 1, 2, 3 and 4 for controlling R1, R2, T1 and T2 respectively.
L3 is a photocell with a polarizer.
The amplification factors of A2 and A3 are adjusted by the corresponding adjustable resistors R1 and R2.
The amplification factors of A2 and A3 are regulated by digital chips, the amplification factor regulating range of A2 is an integer multiple of 2 in 1-100, and the amplification factor regulating range of A3 is 1.0-9.9.
The amplifier A1 arranged behind the light receiving tube L3 is a radio-frequency circuit for signal isolation, so that the amplification precision of the later stage is ensured.
In the smoke concentration acquisition process, whether the background value is larger than a preset threshold value or not is judged, the intensity of the infrared LED luminous tube L1 and/or the blue LED luminous tube L2 is adjusted to be weak if the background value is larger than the preset threshold value, normal smoke concentration acquisition is carried out if the background value is smaller than the preset threshold value, if the smoke concentration is saturated, the intensity of received light is roughly adjusted by using an adjustable resistor R1 corresponding to an amplifier A2, if the expected effect is not obtained through the light receiving adjustment, the intensity of received light is finely adjusted by using an adjustable resistor R2 corresponding to an amplifier A3, and if the expected effect is not obtained through the adjustment of R1 and R2, the intensity of the infrared luminous tube L1 and/or the blue luminous tube L2 is adjusted to be weak again.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention, but the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and these modifications or substitutions should be included in the scope of the present invention.
Claims (5)
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| JPH0991565A (en) * | 1995-09-26 | 1997-04-04 | Matsushita Electric Works Ltd | Photoelectric smoke sensor |
| JP2016114959A (en) * | 2014-12-10 | 2016-06-23 | 能美防災株式会社 | Photoelectric smoke detector |
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| JPS60181636A (en) * | 1984-02-29 | 1985-09-17 | Hochiki Corp | Beam type detector |
| JP2003067862A (en) * | 2001-08-28 | 2003-03-07 | Matsushita Electric Works Ltd | Compound fire sensor |
| CN208187912U (en) * | 2018-01-25 | 2018-12-04 | 福州大学 | The fibre-optical probe measuring instrument of particle speed and concentration in a kind of multiphase flow |
| CN211206161U (en) * | 2019-12-30 | 2020-08-07 | 中国科学院大气物理研究所 | Dual wavelength lidar aerosol measurement system |
| CN218470475U (en) * | 2022-09-08 | 2023-02-10 | 烟台创为新能源科技股份有限公司 | Detection circuit of dual-wavelength smoke detector |
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|---|---|---|---|---|
| JPH0991565A (en) * | 1995-09-26 | 1997-04-04 | Matsushita Electric Works Ltd | Photoelectric smoke sensor |
| JP2016114959A (en) * | 2014-12-10 | 2016-06-23 | 能美防災株式会社 | Photoelectric smoke detector |
| CN107750943A (en) * | 2016-08-18 | 2018-03-06 | 四川航达机电技术开发服务中心 | A kind of plant tissue culture monitoring system |
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