CN112885025A - Single-wavelength light source and double-scattering-angle electrolyte fire and smoke detection device and method - Google Patents
Single-wavelength light source and double-scattering-angle electrolyte fire and smoke detection device and method Download PDFInfo
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Abstract
The invention relates to an electrolyte fire and smoke detection device and method with a single-wavelength light source and double scattering angles. The invention utilizes the asymmetric ratio of the single wavelength condition and the change rate of the asymmetric ratio along with the extinction ratio value to distinguish and identify the electrolyte fire smoke and the interference aerosol. The invention analyzes the difference between the electrolyte fire smoke and the normal heptane open fire smoke, cotton rope smoldering smoke and non-fire aerosol by utilizing an aerosol identification method based on the asymmetry ratio and the change rate of the asymmetry ratio along with the extinction ratio value, and provides theoretical reference and data support for the design of a lithium ion battery fire detector.
Description
Technical Field
The invention relates to the technical field of fire alarm, in particular to a single-wavelength light source and double-scattering angle electrolyte fire smoke detection device and method.
Background
Lithium ion batteries have been produced as a renewable energy source and are widely used because of their advantages of high energy density, light weight, no pollution, etc. However, lithium ion batteries are susceptible to various factors such as temperature, air pressure, and impact and compression during production, transportation, and use, thereby causing fire and explosion accidents. At present, the detector type adopted in the cargo hold of the civil aviation aircraft is mainly a photoelectric smoke detector, has the advantages of high sensitivity, simple structure, low cost and the like, can provide early warning information at the initial stage of fire development, and can provide precious time for evacuation and fire-fighting rescue of personnel. In the original photoelectric smoke detector, only one light source and one receiver are arranged, and electrolyte fire smoke and interference aerosol are difficult to distinguish, so that water vapor, dust and the like in the air of a cargo hold of an airplane can easily cause false alarm of the detector. To meet the required detection performance, the detector needs to maintain a high sensitivity to electrolyte fire smoke, however a high sensitivity often implies a high false alarm rate. Therefore, increasing sensitivity while reducing false alarm rates is a major goal of designers to develop fire smoke detectors. Researchers at home and abroad provide some improved methods and ideas aiming at effective identification of fire, and use detectors and alarms of various light scattering measures including different wavelengths, scattering angles and polarization states or carry out cooperative detection by utilizing multiple parameters such as smoke concentration, temperature, CO concentration and the like, so that fire smoke and interference aerosol can be distinguished to a great extent. However, no detector specially used for lithium ion battery fire scenes exists in the market at present, so whether a fire smoke detection method using the light scattering principle can effectively identify lithium ion battery fires needs to be further researched.
The invention adopts single wavelength light source and double scattering angle technology, selects LED light source which can emit 405 nm-525 nm wavelength blue light to green light, compares the ratio of light power collected from forward and backward scattering angles and the change trend along with extinction ratio value, namely the asymmetry ratio and the change rate thereof according to the scattering light intensity space distribution characteristics of different aerosols to the wavelength, and realizes the detection of electrolyte fire smoke and the identification of interference aerosols.
Disclosure of Invention
The invention aims to provide an electrolyte fire and smoke detection device and method with a single-wavelength light source and double scattering angles, and the detection and anti-interference performance of the conventional photoelectric smoke detector is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the electrolyte fire smoke detection device with the single-wavelength light source and the double-scattering angle comprises a double-light-path smoke detector 1 and a signal acquisition system, wherein the double-light-path smoke detector 1 comprises a light source module 2 and two receiver modules, namely a first receiver module 3 and a second receiver module 4, the light source module 2 comprises an LED light source 5, a light source lens 6, a light source cylindrical sleeve 7 and a light source lens mounting seat 8, the light source lens 6 is used for converging light beams emitted by the LED light source, the LED light source 5 is mounted in internal threads of the light source cylindrical sleeve 7 by utilizing a thread component, the light source lens 6 is mounted in internal threads of the light source lens mounting seat 8 by utilizing a clamping ring, the assembled light source cylindrical sleeve 7 and the light source lens mounting seat 8 are connected by utilizing respective internal and external threads and are fixed at the position with the radius of a disc of 4cm by a screw, the light source lens 6 is used for converging the light beams emitted by the LED light source, the first receiver module 3 comprises a first receiver 10, a first receiver lens 12, a first receiver cylindrical sleeve 14 and a first receiver lens mounting seat 16, the first receiver 10 is mounted in the internal thread of the first receiver cylindrical sleeve 14 by a screw assembly, the first receiver lens 12 is mounted in the internal thread of the first receiver lens mounting seat 16 by a snap ring, the assembled first receiver cylindrical sleeve 14 and the first receiver lens mounting seat 16 are connected by respective internal and external threads and then fixed on a disc at a position with a radius of 4cm and an included angle of 45 degrees with the light source module 2 by a screw, the first receiver lens 12 is used for converging the light signal scattered from the center of the disc and transmitting the light signal to the first receiver 10 to obtain the scattered light power of a first path of photocurrent signal, and the second receiver module 4 comprises a second receiver 9, A second receiver lens 11, a second receiver cylindrical sleeve 13 and a second receiver lens mounting 15, the first receiver 10 and the second receiver 9 being arranged at scattering angles of 45 ° and 135 °, respectively, receiving scattered optical power of corresponding angles, the second receiver 9 being mounted with a screw assembly in an internal thread of the second receiver cylindrical sleeve 13, the second receiver lens 11 is mounted in an internal thread of the second receiver lens mount 15 by a snap ring, the assembled second receiver cylindrical sleeve 13 and second receiver lens mount 15 are connected by respective internal and external threads, then, the optical fiber is fixed at the position of the disc with the radius of 4cm through a screw, the included angle between the optical fiber and the light source module 2 is 135 degrees, and the second receiver lens 11 is used for converging the optical signals scattered from the center of the disc and transmitting the optical signals to the second receiver 9 to obtain the scattered light power of the second path of optical current signals;
the signal acquisition system comprises an LED light source driver 17, a first signal amplifier 18, a second signal amplifier 19, a data acquisition instrument 20 and a computer 21, wherein the LED light source driver 17 can provide a long-term stable power supply voltage for the LED light source, the first signal amplifier 18 and the second signal amplifier 19 can convert photocurrent signals of the first receiver and the second receiver into analog voltage signals, and the data acquisition instrument 20 is used for acquiring the analog voltage signals to the computer 21.
The LED light source 5 is a single wavelength LED light source.
The method for detecting fire and smoke by using the electrolyte with the single-wavelength light source and the double-scattering angle comprises the following steps:
the first step is as follows: the emitter emits a light beam of a certain wavelength, and the two receivers simultaneously receive the forward scattered light power P and the backward scattered light power PF、PB；
The second step is that: judging the forward scattered light power P under the condition of the wavelengthFAnd background light power PF0If the difference is larger than the constant value a, carrying out the next step, otherwise, carrying out the first step;
the third step: calculating the power P of forward scattered light under the condition of the wavelengthFAnd the power P of the backward scattered lightBThe ratio and the change trend of the ratio along with the extinction ratio value, namely the asymmetry ratio and the change rate thereof, are combined with the asymmetry ratio of the previous N-1 times, the standard deviation of the asymmetry ratio is calculated, whether the standard deviation is smaller than a constant value b or not is judged, if yes, the next step is carried out, and if not, the first step is carried out;
the fourth step: judging whether the current asymmetry ratio is larger than a constant value c and smaller than a constant value d or whether the change rate of the current asymmetry ratio is larger than e, if so, carrying out the next step, otherwise, carrying out the first step;
the fifth step: judging the type of the current aerosol particles according to the sizes of c, d and e;
in the above five steps, the sizes of a, b, c, d and e need to be measured according to specific experiments, and the size of N also needs to be determined according to the experimental results. Wherein a and b are used to distinguish between no aerosol particles or very small amounts of aerosol particles, and c, d and e are used to distinguish between electrolyte fire smoke and interfering aerosols. The method is characterized in that: the types of aerosol particles that may be detected at this wavelength can be determined by the five steps described above.
The types of aerosol particles that may be detected at this wavelength can be determined by the five steps described above.
The electrolyte emits 405 nm-525 nm blue light to green light, and can accurately distinguish the electrolyte fire smoke from interference aerosol.
The principle of the invention is as follows: the single wavelength, dual scattering angle detection technique can be used to identify electrolyte fire smoke from interfering aerosols because for certain defined aerosol particles a corresponding spatial distribution of scattered light intensity is produced, typically much greater in the front hemisphere than in the back hemisphere. In the invention, by simultaneously measuring the scattered light power of two different scattering angles, the ratio of the two scattered light powers and the change trend of the ratio with the extinction ratio value are used for indicating certain aerosol particles. Typically, one is a forward scattering angle (less than 90 °), and the other is a backward scattering angle (greater than 90 °). In general, the larger the particle size, the greater the proportion of forward scattered light intensity to the total scattered light intensity, and therefore the greater the resulting asymmetry ratio and its rate of change. By comparing the asymmetry ratio under the conditions of single wavelength and double scattering angles and the change rate of the asymmetry ratio along with the extinction ratio value, the relationship between the scattering light intensity distribution characteristics and the wavelength of different aerosols can be reflected so as to distinguish the different aerosols.
The invention provides a scattered signal measuring and processing mode, which can be applied to a conventional photoelectric smoke detector. The detector is internally provided with the emitter and the two receivers, the emitter can emit light with at most different wavelengths, the two receivers are used for collecting scattered light power of two different angles, the scattered light power of two different angles under a certain wavelength condition can be measured simultaneously, and therefore the asymmetric ratio and the change rate of the asymmetric ratio along with the extinction ratio can be obtained by calculating the ratio.
The beneficial effect produced by adopting the above technical scheme is that: compared with the existing optical smoke detector, the electrolyte fire smoke detection device and method with the single-wavelength light source and the double-scattering angle can detect the electrolyte fire smoke more effectively, and are specifically embodied as follows:
(1) and distinguishing and identifying the electrolyte fire smoke and the interference aerosol by using the asymmetric ratio and the change rate of the asymmetric ratio measured by the single-wavelength light source and the double-scattering angle.
(2) The detector is provided with the emitter and the two receivers, the emitter can emit light with various wavelengths, the two receivers are used for collecting scattered light power of two different angles, the scattered light power of two different angles under the condition of a certain wavelength can be measured simultaneously, therefore, the asymmetric ratio and the change rate of the asymmetric ratio along with the extinction ratio can be obtained by calculating the ratio, and the detection of the fire and smoke of the early electrolyte can be realized.
(3) The detection method provided by the invention does not adopt a signal intensity threshold value to judge whether an alarm should be given or not, so that the detection method can accurately distinguish electrolyte fire smoke and interference aerosol.
Drawings
FIG. 1 is a schematic view of a dual optical path smoke detector of an electrolyte fire smoke detector implementing a single wavelength light source and dual scattering angles upon which the present invention is based.
Fig. 2 is a schematic diagram of a signal acquisition system of a dual-light-path smoke detector of the electrolyte fire smoke detection device with a single-wavelength light source and a dual-scattering angle.
FIG. 3 is a graph showing the relationship between the asymmetry ratio and extinction ratio obtained by the single wavelength light source and the double scattering angle electrolyte fire smoke detection device.
FIG. 4 shows the dispersion asymmetry ratio AR of the electrolyte fire smoke at different wavelengths.
Fig. 5 shows the asymmetry factor of particles of different complex refractive indices.
The system comprises a 1-double-light-path smoke detector, a 2-light source module, a 3-first receiver module, a 4-second receiver module, a 5-LED light source, a 6-light source lens, a 7-light source cylindrical sleeve, an 8-light source lens mounting seat, a 9-second receiver, a 10-first receiver, an 11-second receiver lens, a 12-first receiver lens, a 13-second receiver cylindrical sleeve, a 14-first receiver cylindrical sleeve, a 15-second receiver lens mounting seat, a 16-first receiver lens mounting seat, a 17-LED light source driver, an 18-first signal amplifier, a 19-second signal amplifier, a 20-data acquisition instrument and a 21-computer.
Detailed Description
For a further understanding and appreciation of the structural features and advantages of the invention, reference should be made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:
the electrolyte fire smoke detection device with the single-wavelength light source and the double scattering angles comprises a light source module 2, a first receiver module 3, a second receiver module 4, an LED light source 5, a light source lens 6, a light source cylindrical sleeve 7, a light source lens mounting seat 8, a second receiver 9, a first receiver 10, a second receiver lens 11, a first receiver lens 12, a second receiver cylindrical sleeve 13, a first receiver cylindrical sleeve 14, a second receiver lens mounting seat 15, a first receiver lens mounting seat 16, an LED light source driver 17, a first signal amplifier 18, a second signal amplifier 19, a data acquisition instrument 20 and a computer 21.
The early-stage electrolyte fire smoke detection and identification method based on the asymmetric ratio of the scattering light intensity of aerosol particles and the change rate of the aerosol particle scattering light intensity along with the extinction ratio value is applied to a double-light-path smoke detector 1 of an electrolyte fire smoke detection device with a single-wavelength light source and double scattering angles, wherein the double-light-path smoke detector comprises a light source module 2 and two receiver modules, namely a first receiver module 3 and a second receiver module 4. Wherein, light source module 2 includes an LED light source 5, light source lens 6, light source cylinder sleeve 7 and light source lens mount pad 8, LED light source 5 utilizes screw assembly to install in the internal thread of light source cylinder sleeve 7, light source lens 6 is installed in the internal thread of light source lens mount pad 8 through the snap ring, light source cylinder sleeve 7 and light source lens mount pad 8 assembled utilize respective inside and outside screw thread to be connected and the radius through the screw fixation at the disc is 4cm position, light source lens 6 is used for assembling the light beam that LED light source 5 sent in order to provide the required stable light beam of detector device. In the present embodiment, a single-wavelength LED light source is used, so that when the result of measuring another wavelength needs to be measured, the corresponding LED light source needs to be replaced in advance. The light source lens 6 is mainly used for converging light beams emitted by the LED light source, is beneficial to enhancing scattering signals of aerosol particles, and can prevent the LED light source from being polluted by the aerosol particles. The first receiver module 3 comprises a first receiver 10, a first receiver lens 12, a first receiver cylindrical sleeve 14 and a first receiver lens mounting seat 16, the first receiver 10 is mounted in the internal thread of the first receiver cylindrical sleeve 14 by a screw assembly, the first receiver lens 12 is mounted in the internal thread of the first receiver lens mounting seat 16 by a snap ring, the assembled first receiver cylindrical sleeve 14 and the first receiver lens mounting seat 16 are connected by respective internal and external threads and then fixed on a disc at a position with a radius of 4cm and an included angle of 45 degrees with the light source module 2 by a screw, the first receiver lens 12 is used for converging an optical signal scattered from the center of the disc and transmitting the optical signal to the first receiver 10 to obtain scattered light power of a first path of photocurrent signal, and the second receiver module 4 comprises a second receiver 9, A second receiver lens 11, a second receiver cylindrical sleeve 13, a second receiver lens mounting 15, a first receiver 10 and a second receiver 9 arranged at scattering angles of 45 ° and 135 °, respectively, receiving scattered light power of corresponding angles, the second receiver 9 being mounted with a screw assembly in an internal thread of the second receiver cylindrical sleeve 13, the second receiver lens 11 is mounted in an internal thread of the second receiver lens mount 15 by a snap ring, the assembled second receiver cylindrical sleeve 13 and second receiver lens mount 15 are connected by respective internal and external threads, and then the optical fiber is fixed on the position with the radius of 4cm of the disc by a screw, the included angle between the optical fiber and the light source module 2 is 135 degrees, and the second receiver lens 11 is used for converging the optical signal scattered from the center of the disc and transmitting the optical signal to a second receiver 9 to obtain the scattered light power of a second path of optical current signal. In the embodiment, a photodetector product of sorel corporation, which is SM05PD1A, is selected, and can respond to incident light in a wavelength range of 350nm to 1100nm, and has high sensitivity and very weak response to optical signals.
Fig. 2 is a schematic diagram of a signal acquisition system of the electrolyte fire smoke detection device with a single-wavelength light source and a double-scattering angle, which mainly comprises an LED light source driver 17, a first signal amplifier 18, a second signal amplifier 19, a data acquisition instrument 20 and a computer 21. Wherein the LED light source driver 17 can provide a long-term stable power supply voltage for the LED light source, the first signal amplifier 18 and the second signal amplifier 19 can convert the photocurrent signal of the receiver into an analog voltage signal, and the data collector 20 is used to collect the analog voltage signal to the computer 21. In this embodiment the signal is acquired at a frequency of 5Hz, so that 5 forward or backward scattered light powers are available per second. To smooth the data results, the average of 5 signal data collected over 1s was used to calculate the asymmetry ratio.
Fig. 3 is a relationship between an asymmetry ratio and an extinction ratio obtained under a normal working condition (without aerosol particles) of the dual-optical-path smoke detector model, wherein the extinction ratio ranges from 0% to 20%/m, and in the graph, the abscissa indicates the value of the extinction ratio, before aerosol supply is stopped, and AR after aerosol supply is stopped actually stabilizes at a certain level. The particle size distribution of the D90 dust is stable, and the AR value is stable between 3.0 and 3.5. Fire smoke particles continue to coalesce over time, from the first tens of nanometers to hundreds of nanometers. The coagulation effect of cotton rope smoldering particles is weak, the particle size distribution is stable, and AR is stable near 7.0; the condensation effect of the normal heptane fire smoke particles is strong, the particle size distribution of the normal heptane fire smoke particles is gradually increased, and AR is 2.0-4.5; the electrolyte fire smoke AR develops faster and is increased from 1.2 to about 6.7, which shows that the particle size distribution of the electrolyte fire smoke is larger. The experimental result shows that the AR change rate of the electrolyte fire smoke is obviously higher than that of other types of aerosol, and cotton rope smoldering fire, normal heptane fire and D90 dust can be distinguished through the relative size of the AR value.
FIG. 4 shows the dispersion asymmetry ratio AR of the electrolyte fire smoke at different wavelengths. In order to search for the optimal light source, the scattering asymmetry ratio of the electrolyte fire smoke by a plurality of LED light sources from blue light to infrared light bands is selected for measurement. At the initial stage of fire generation, the scattering asymmetry ratio at each wavelength rapidly increases with an increase in extinction ratio, and the AR increase rate increases as the wavelength becomes shorter. Wherein AR under the action of blue light405nmThe value increases rapidly with extinction ratio, then becomes stable, and finally gradually decreases; and AR under green and red light525nmAnd AR630nmThe value gradually rises along with the extinction ratio and finally approaches a stable value; AR under the action of infrared light870nmThe value is in the rising phase throughout the process. Therefore, the AR change rate of the electrolyte fire smoke is larger under the action of short wavelength, and the quick response of the detector is facilitated.
The asymmetry factor < cos θ > is an important parameter that characterizes the particle light scattering as a whole. When the value of < cos theta > is greater than 0, the total forward scattered intensity is greater than the total backward scattered intensity; when the value of < cos θ > is equal to 0, the total forward scattered light intensity is equal to the total backward scattered light intensity; when the value of < cos θ > is less than 0, the total forward scattered light intensity is less than the total backward scattered light intensity. The larger the asymmetry factor, the larger the AR value.
The relative size of the incident light wavelength λ and the particle diameter d (x ═ π d/λ) directly influences the scattered light characteristics. Particles with the same size parameters have similar scattering characteristics according to the scale invariant principle. Size parameters for electrolyte fire smoke particlesGenerally not exceeding 3, fig. 5 shows the asymmetry factor of particles of different complex refractive indices. As the imaginary part of the complex refractive index of the particles decreases, the asymmetry factor changes gradually from monotonically increasing to non-monotonically increasing with increasing size parameter, beginning to extrema. Electrolyte fire smoke AR405nmThe scattering characteristics of particles of the type with a smaller imaginary part are represented as non-monotonic changes. The particle size distribution of cotton rope smoldering particles is stable, so that the AR is not greatly changed. The size parameter is enlarged due to the increase of the diameter of fire smoke particles of the electrolyte, so that the asymmetry factor is enlarged, and the corresponding AR change rate is large; the size parameter at short wavelengths increases at a faster rate, so the AR change rate is greater.
In the design process of the electrolyte fire smoke detector, blue light to green light with the wavelength of 405-525 nm can be adopted, and the detection method of the short-wavelength light source and the double scattering angle is more favorable for realizing the quick response and judgment of the detector.
Claims (5)
1. Electrolyte fire smoke detection device of single wavelength light source and two scattering angles, its characterized in that: the double-light-path smoke detector comprises a double-light-path smoke detector (1) and a signal acquisition system, wherein the double-light-path smoke detector (1) comprises a light source module (2) and two receiver modules, namely a first receiver module (3) and a second receiver module (4), the light source module (2) comprises an LED light source (5), a light source lens (6), a light source cylindrical sleeve (7) and a light source lens mounting seat (8), the light source lens (6) is used for converging light beams emitted by the LED light source, the LED light source (5) is mounted in internal threads of the light source cylindrical sleeve (7) through a thread component, the light source lens (6) is mounted in internal threads of the light source lens mounting seat (8) through a clamping ring, the assembled light source cylindrical sleeve (7) and the light source lens mounting seat (8) are connected through respective internal and external threads and are fixed at the position of 4cm radius of a disc through screws, the light source lens (6) is used for converging light beams emitted by the LED light source (5) to provide stable light beams required by the detector device, the first receiver module (3) comprises a first receiver (10), a first receiver lens (12), a first receiver cylindrical sleeve (14) and a first receiver lens mounting seat (16), the first receiver (10) is installed in internal threads of the first receiver cylindrical sleeve (14) through a thread component, the first receiver lens (12) is installed in internal threads of the first receiver lens mounting seat (16) through a clamping ring, the assembled first receiver cylindrical sleeve (14) and the first receiver lens mounting seat (16) are connected through respective internal threads and external threads, and then are fixed to the position, with the radius of 4cm, of the disc through a screw, and the included angle of 45 degrees with the light source module (2), the first receiver lens (12) is used for converging light signals scattered from the center of the disc and transmitting the light signals to the first receiver (10) Obtaining scattered light power of a first path of photocurrent signals, wherein the second receiver module (4) comprises a second receiver (9), a second receiver lens (11), a second receiver cylindrical sleeve (13) and a second receiver lens mounting seat (15), the first receiver (10) and the second receiver (9) are respectively arranged at positions with scattering angles of 45 degrees and 135 degrees and receive scattered light power of corresponding angles, the second receiver (9) is mounted in internal threads of the second receiver cylindrical sleeve (13) through a thread component, the second receiver lens (11) is mounted in internal threads of the second receiver lens mounting seat (15) through a clamping ring, the assembled second receiver cylindrical sleeve (13) and the second receiver lens mounting seat (15) are connected through respective internal threads and external threads, and then are fixed at a position with a radius of 4cm and an included angle of 135 degrees with the light source module (2) through screws, the second receiver lens (11) is used for converging the light signal scattered from the center of the disc and transmitting the light signal to a second receiver (9) to obtain scattered light power of a second path of light current signal;
the signal acquisition system comprises an LED light source driver (17), a first signal amplifier (18) and a second signal amplifier (19), a data acquisition instrument (20) and a computer (21), wherein the LED light source driver (17) can provide a long-term stable power supply voltage for the LED light source, the first signal amplifier (18) and the second signal amplifier (19) can convert photocurrent signals of the first receiver and the second receiver into analog voltage signals, and the data acquisition instrument (20) is used for acquiring the analog voltage signals to the computer (21).
2. The single wavelength light source and dual scattering angle electrolyte fire smoke detection device of claim 1, wherein: the LED light source (5) adopts a single-wavelength LED light source.
3. The method for detecting the fire and smoke of the electrolyte with the single-wavelength light source and the double scattering angles is characterized by comprising the following steps of: the method comprises the following steps:
the first step is as follows: the emitter emits a light beam of a certain wavelength, and the two receivers simultaneously receive the forward scattered light power P and the backward scattered light power PF、PB；
The second step is that: judging the forward scattered light power P under the condition of the wavelengthFAnd background light power PF0If the difference is larger than the constant value a, carrying out the next step, otherwise, carrying out the first step;
the third step: calculating the power P of forward scattered light under the condition of the wavelengthFAnd the power P of the backward scattered lightBThe ratio and the change trend of the ratio along with the extinction ratio value, namely the asymmetry ratio and the change rate thereof, are combined with the asymmetry ratio of the previous N-1 times, the standard deviation of the asymmetry ratio is calculated, whether the standard deviation is smaller than a constant value b or not is judged, if yes, the next step is carried out, and if not, the first step is carried out;
the fourth step: judging whether the current asymmetry ratio is larger than a constant value c and smaller than a constant value d or whether the change rate of the current asymmetry ratio is larger than e, if so, carrying out the next step, otherwise, carrying out the first step;
the fifth step: judging the type of the current aerosol particles according to the sizes of c, d and e;
in the five steps, the sizes of a, b, c, d and e are measured according to a specific experiment, and the size of N is determined according to an experiment result; wherein a and b are used to distinguish between no aerosol particles or very small amounts of aerosol particles, and c, d and e are used to distinguish between electrolyte fire smoke and interfering aerosols.
4. The single wavelength light source and dual scattering angle electrolyte fire smoke detection method of claim 3, wherein: the types of aerosol particles that may be detected at this wavelength can be determined by the five steps described above.
5. The single wavelength light source and dual scattering angle electrolyte fire smoke detection method of claim 3, wherein: the electrolyte emits 405 nm-525 nm blue light to green light, and can accurately distinguish the electrolyte fire smoke from interference aerosol.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113686738A (en) * | 2021-08-04 | 2021-11-23 | 王殊 | Lithium battery leakage monitoring method for detecting aerosol characteristics |
| CN114913667A (en) * | 2022-05-06 | 2022-08-16 | 合肥科大立安安全技术有限责任公司 | Anti-interference sensing device for smoke in early stage of fire and anti-interference method thereof |
| EP4332936A1 (en) * | 2022-08-08 | 2024-03-06 | Carrier Corporation | Single-wave multi-angle smoke alarm algorithm |
| CN113686738B (en) * | 2021-08-04 | 2024-06-07 | 王殊 | Lithium battery leakage monitoring method for detecting aerosol characteristics |
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2021
- 2021-03-11 CN CN202110267405.1A patent/CN112885025A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113686738A (en) * | 2021-08-04 | 2021-11-23 | 王殊 | Lithium battery leakage monitoring method for detecting aerosol characteristics |
| CN113686738B (en) * | 2021-08-04 | 2024-06-07 | 王殊 | Lithium battery leakage monitoring method for detecting aerosol characteristics |
| CN114913667A (en) * | 2022-05-06 | 2022-08-16 | 合肥科大立安安全技术有限责任公司 | Anti-interference sensing device for smoke in early stage of fire and anti-interference method thereof |
| CN114913667B (en) * | 2022-05-06 | 2023-08-11 | 合肥科大立安安全技术有限责任公司 | Fire early smoke anti-interference sensing device and anti-interference method thereof |
| EP4332936A1 (en) * | 2022-08-08 | 2024-03-06 | Carrier Corporation | Single-wave multi-angle smoke alarm algorithm |
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