CN117671877A - ELDS-based early detection device and method for fire disaster of heat insulation material - Google Patents
ELDS-based early detection device and method for fire disaster of heat insulation material Download PDFInfo
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- CN117671877A CN117671877A CN202311364570.4A CN202311364570A CN117671877A CN 117671877 A CN117671877 A CN 117671877A CN 202311364570 A CN202311364570 A CN 202311364570A CN 117671877 A CN117671877 A CN 117671877A
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- 238000001514 detection method Methods 0.000 title claims abstract description 69
- 239000012774 insulation material Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000000197 pyrolysis Methods 0.000 claims abstract description 26
- 229920006254 polymer film Polymers 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims description 21
- 238000010521 absorption reaction Methods 0.000 claims description 18
- 230000005855 radiation Effects 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 238000012886 linear function Methods 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 5
- 229920000620 organic polymer Polymers 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 6
- 238000004321 preservation Methods 0.000 abstract description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 79
- 239000011810 insulating material Substances 0.000 description 7
- 239000000779 smoke Substances 0.000 description 5
- YIWUKEYIRIRTPP-UHFFFAOYSA-N 2-ethylhexan-1-ol Chemical compound CCCCC(CC)CO YIWUKEYIRIRTPP-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/20—Calibration, including self-calibrating arrangements
- G08B29/24—Self-calibration, e.g. compensating for environmental drift or ageing of components
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B31/00—Predictive alarm systems characterised by extrapolation or other computation using updated historic data
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Computer Security & Cryptography (AREA)
- Computing Systems (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Fire-Detection Mechanisms (AREA)
Abstract
The invention provides an ELDS-based early detection device and method for fire of a heat insulation material, and belongs to the technical field of fire detection of building heat insulation materials. The technical problems of fire disaster identification and early warning in the smoldering stage of heat preservation materials in urban ice and snow places in the prior art are solved. The technical proposal is as follows: the device comprises an air suction device and a detection device, wherein a gas transmission pipe is arranged between the air suction device and the detection device, and a high polymer film and a characteristic gas detection and data processing device are arranged in the detection device, so that the device has the beneficial effects that: according to the invention, the thermal insulation material pyrolysis and fire disaster characteristic gas separated by the polymer film and the concentration thereof are identified through self-calibration characteristic laser, and an intelligent data decision system is constructed to judge whether a fire disaster occurs or not and transmit key information to a background control end when the fire disaster occurs.
Description
Technical Field
The invention relates to the technical field of heat insulation material fire detection in urban ice and snow places, in particular to an ELDS-based heat insulation material fire early detection device and method.
Background
In order to ensure that the temperature effect indoor ice and snow venues are widely applied with flammable and combustible heat-insulating materials such as polyurethane, polystyrene and the like, the materials have low ignition point and high combustion speed, are generally filled in a well-closed interlayer, are in a smoldering state at the initial stage of fire after being ignited, and are extremely difficult to be detected from the outside; in addition, the heat insulation materials are mutually communicated in each indoor area, once combustion occurs, the heat insulation materials are mutually ignited to cause a large-area fire disaster, and a large amount of high Wen Duhai smoke is generated during combustion, so that escape and rescue of personnel are difficult to develop, and serious casualties and property loss are caused, and therefore, the method has great significance in detecting and early warning fire disasters in smoldering periods of the heat insulation materials in urban ice and snow places.
At present, the detection and early warning equipment for the fire disaster of the heat preservation material in the urban ice and snow places is very few, and most of the detection and early warning equipment is a traditional detector for detecting the fire disaster in the area, such as a smoke detector for detecting the smoke of the fire disaster, a temperature-sensing detector for detecting the temperature of the fire disaster, an infrared sensor with an optical structure and the like, but the infrared sensor has weak light source signals and poor moisture resistance, the indoor heat preservation material is inflammable and has a closed position due to the high indoor humidity in the ice and snow places, the service life of the sensor is short above the environment, and when the detector alarms, the fire is larger and ignites and spreads mutually, and a large amount of high-temperature toxic smoke is generated; therefore, in order to effectively prevent the occurrence of the fire disaster of the heat insulation material in the urban ice and snow places, the identification and the early warning of the fire disaster of the heat insulation material in the smoldering stage are very important.
Disclosure of Invention
The invention aims to provide an ELDS-based early detection device and method for fire of heat-insulating materials, wherein the device is used for detecting a fire gas cavity separated by a high polymer film through a suction device combined with a laser detector so as to realize early detection and early warning of fire of the heat-insulating materials, and provides a new method for early detection of fire of heat-insulating materials in smoldering periods in urban ice and snow places such as refrigerators, ice and snow sports fields, recreation grounds and the like.
In order to achieve the aim of the invention, the invention adopts the technical scheme that: the ELDS-based early detection device for the fire disaster of the heat insulating material comprises an air suction device and a detection device, wherein an air transmission pipe is arranged between the air suction device and the detection device, the air suction device comprises a cavity, a plurality of air inlet pipes are arranged on the cavity, and an air suction pump is further arranged in the cavity between the air inlet pipes and the air transmission pipe; the detection device comprises a shell, a high polymer film and a characteristic gas detection and data processing device are arranged in the shell, the high polymer film divides the interior of the shell into a first air cavity and a second air cavity, an air outlet pipe is arranged on the first air cavity and the second air cavity respectively, and the characteristic gas detection and data processing device comprises a self-calibration system, a gas concentration detection system, an optical signal processing system and an intelligent data decision system.
Further, filter screens are arranged in the air inlet pipe, the air delivery pipe and the air outlet pipe, and the filter screens are micron-sized filter screens, so that the filter screens can be better used for filtering larger particles in air, such as dust, smoke and the like.
Furthermore, the high polymer film in the detection device is a uniform film made of organic high polymer, and the two sides of the high polymer film are respectively provided with metal reticular spacers, so that the damage of the film can be reduced, and the long-term usability of the film is maintained.
Furthermore, the self-calibration system comprises a built-in reflecting mirror and a detection unit, so that the zero drift problem can be avoided, intelligent calibration of the light source device is realized, and the detection accuracy is ensured.
Further, the gas concentration detection system comprises a first laser emitter group and a second laser emitter group, wherein the first laser emitter group and the second laser emitter group are respectively arranged inside the first air cavity and the second air cavity, a laser diode for detecting pyrolysis characteristic gas concentration is arranged in the first laser emitter group, and a laser diode for detecting fire characteristic gas concentration is arranged in the second laser emitter group.
Further, the optical signal processing system comprises a scattered light signal processing system, a pyrolysis characteristic gas optical signal processing system and a fire characteristic gas optical signal processing system which are arranged in the shell.
Further, an explosion-proof and moisture-proof audible and visual alarm device is arranged on the outer side of the shell and used for external alarm.
Further, the shell is made of metal materials.
Further, the specification of the laser emitter group of the first air cavity is as follows:
wavelength of outgoing laser: 7-12 μm;
energy: 2320mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
The laser emitter group specification of the second air cavity is as follows:
wavelength of outgoing laser: 4.2-4.6 μm;
energy: 1075mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
Based on lambert-beer law, after single frequency radiation light passes through the gas to be detected, the relation between the light intensity and the gas concentration is as follows:
I(ν)＝I 0 (ν)exp[-σ(ν)cL]
σ(ν)＝Sφ(ν)
I 0 (v) -the intensity of the light before absorption of the gas;
sigma (v) -gas absorption cross section, representing the absorption profile of a gas at a single frequency of radiation;
l-absorption path length;
c-gas concentration;
s-molecule absorption line is strong and is related to temperature;
phi (v) -absorption linear function.
The invention also provides an ELDS-based early detection method for fire of the heat-insulating material, which comprises the following steps:
s1: the air suction device absorbs smoldering fire gas in the protection area, and characteristic gas enters the first air cavity and the second air cavity in sequence after being separated;
s2: the first laser emitter group and the second laser emitter group in the gas concentration detection system respectively detect the gas in the first air cavity and the second air cavity, and the pyrolysis characteristic gas optical signal processing system and the fire characteristic gas optical signal processing system respectively process the detection information of the gas at two sides and transmit the processing information to the intelligent data decision system;
s3: and the intelligent data decision system judges whether fire disaster occurs or not from two paths according to the received processing information, namely when the time interval is shortened after pyrolysis characteristic gas is detected for the first time and then two continuous detections are carried out, and when pyrolysis characteristic gas still exists or when pyrolysis characteristic gas is not detected but fire disaster characteristic gas exceeding concentration limit is detected, a signal is sent to an early warning device to carry out acousto-optic early warning, and meanwhile, gas concentration information and ignition position information are sent to a background control end.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the thermal insulation material pyrolysis separated by the polymer film and the fire disaster characteristic gas and the concentration thereof are identified through self-calibration characteristic laser, an intelligent data processing system is constructed to judge whether a fire disaster occurs or not from different paths, and to transmit key information to a background control end when the fire disaster occurs, and an explosion-proof and moisture-proof acousto-optic early warning system is combined to transmit alarm information to the surroundings;
2. according to the invention, pyrolysis characteristic gases of tetrahydropyran-2-methyl formate and 2-ethylhexanol are adopted when the heat preservation material is smoldering, and the two gases respectively account for 42.2% and 10.3% of pyrolysis gas in relative content when the heat preservation material is pyrolyzed, and have long retention time, so that compared with other fire gas, the early detection of the fire can be realized; compared with chemical, infrared, solid-state and other methods, the laser method is more accurate and stable, the characteristic laser corresponding to the characteristic gas is adopted to more accurately distinguish fire signals, and the self-calibration system can correct equipment errors, so that the light source always works in an expected state, and the drift problem of zero points and measuring ranges is effectively avoided.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a flow chart of the operation of the present invention.
Wherein, the reference numerals are as follows: 1. an air suction device; 2. a detection device; 3. a gas pipe; 4. a cavity; 5. an air inlet pipe; 6. a getter pump; 7. a housing; 8. a polymer film; 9. a first air chamber; 10. a second air chamber; 11. an air outlet pipe; 12. a filter screen; 13. a built-in reflecting mirror; 14. a detection unit; 15. a first laser emitter group; 16. a second laser emitter group; 17. a scattered light signal processing system; 18. a pyrolysis characteristic gas optical signal processing system; 19. the fire disaster characteristic gas optical signal processing system; 20. an audible and visual alarm device; 21. a metal mesh spacer; 22. an intelligent data decision system.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. Of course, the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Examples:
as shown in fig. 1, the invention provides an ELDS-based early detection device for fire disaster of a heat insulation material, which comprises an air suction device 1 and a detection device 2, wherein an air delivery pipe 3 is arranged between the air suction device 1 and the detection device 2, the air suction device 1 comprises a cavity 4, a plurality of air inlet pipes 5 are arranged on the cavity 4, and an air suction pump 6 is further arranged in the cavity 4 between the air inlet pipes 5 and the air delivery pipe 3; the detection device 2 comprises a shell 7 made of metal materials, a high polymer film 8 and a characteristic gas detection and data processing device are arranged in the shell 7, the high polymer film 8 divides the interior of the shell 7 into a first gas cavity 9 and a second gas cavity 10, the first gas cavity 9 mainly detects gas comprising tetrahydropyran-2-methyl formate (C7H 12O 3) and 2-ethylhexanol (C8H 18O), the second gas cavity 10 mainly detects gas comprising carbon monoxide and carbon dioxide, gas outlet pipes 11 are respectively arranged on the first gas cavity 9 and the second gas cavity 10, and the whole detection and data processing device comprises a self-calibration system, a gas concentration detection system, an optical signal processing system and an intelligent data decision system.
The air inlet pipe 5, the air delivery pipe 3 and the air outlet pipe 11 are respectively provided with a filter screen 12, and the filter screens 12 adopt micron-sized filter screens for filtering larger particles in the air, such as dust, flue gas and the like.
The high molecular film 8 is a uniform film made of organic high molecular polymer, has the characteristics of strong chemical stability, excellent high-temperature performance, good hydrophobicity and the like, can realize the gas separation of thermal insulation material pyrolysis volatile gas and the like and fire disaster characteristic gas, namely, allows carbon monoxide and carbon dioxide molecules to pass through, isolates the pyrolysis characteristic gas in an upper air cavity, and is respectively provided with a metal reticular separation sheet 21 at two sides of the film so as to reduce the damage of the film and maintain the long-term usability of the film.
The self-calibration system comprises the built-in reflecting mirror 13 and the detecting unit 14, so that the zero drift problem can be avoided, the intelligent calibration of the light source device is realized, and the detection accuracy is ensured.
The gas concentration detection system comprises a first laser emitter group 15 and a second laser emitter group 16, wherein the first laser emitter group 15 and the second laser emitter group 16 are respectively arranged inside the first gas cavity 9 and the second gas cavity 10, a laser diode corresponding to pyrolysis characteristic gas is arranged in the first laser emitter group 15, a laser diode corresponding to fire characteristic gas is arranged in the second laser emitter group 16, and the laser diode is used for detecting characteristic gas concentration.
The optical signal processing system includes a scattered light signal processing system 17, a pyrolysis characteristic gas optical signal processing system 18, and a fire characteristic gas optical signal processing system 19 disposed inside the housing 7.
An audible and visual alarm device 20 is arranged on the outer side of the shell 7, and an operation result output by the intelligent data decision system 12 is intelligently processed and judged to determine whether to touch the audible and visual early warning device.
The first laser emitter group 15 and the second laser emitter group 16 are respectively arranged at the top of the first air cavity 9 and the second air cavity 10 and are respectively used for detecting pyrolysis characteristic air and fire characteristic air, and gain media are arranged in the first laser emitter group and the second laser emitter group, so that laser light in a specific wavelength range related to the detection characteristic air can be emitted to realize gas concentration data collection and accuracy.
The specifications of the laser emitter group of the first air cavity 9 are as follows:
wavelength of outgoing laser: 7-12 μm;
energy: 2320mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
The laser emitter group specification of the second air chamber 10 is as follows:
wavelength of outgoing laser: 4.2-4.6 μm;
energy: 1075mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
Based on Lambert-Beer law, after single frequency radiation light passes through the gas to be measured, the relationship between the light intensity and the gas concentration is as follows:
I(ν)＝I 0 (ν)exp[-σ(ν)cL]
σ(ν)＝Sφ(ν)
I 0 (v) -the intensity of the light before absorption of the gas;
sigma (v) -gas absorption cross section, representing the absorption profile of a gas at a single frequency of radiation;
l-absorption path length;
c-gas concentration;
s-molecule absorption line is strong and is related to temperature;
phi (v) -absorption linear function;
based on the principle, the optical signal processing systems arranged at the side surface and the bottom of the air cavity can respectively demodulate and amplify the intensity signals of the scattered light absorbed by the characteristic gas, convert the intensity signals into electric signals and input the electric signals into the intelligent data decision system. The sound-light early warning device is set to be a dampproof and explosion-proof device according to the specification requirements of GB26851-2011 fire sound and/or light alarm standard and GB3836, 1-2000 explosion-proof electrical equipment general requirements for explosive environments and the like, and is started immediately after receiving a trigger signal, and alarm information is transmitted to the surrounding by sound signals with sound pressure level not less than 75dB and light signals not less than 100 lx.
The invention also provides an ELDS-based early detection method for fire of the heat-insulating material, which comprises the following steps:
s1: the air suction device 1 absorbs smoldering fire gas in the protection area, and characteristic gas sequentially enters the first air cavity 9 and the second air cavity 10;
s2: the first laser emitter group 15 and the second laser emitter group 16 in the gas concentration detection system respectively detect the gas in the first air cavity 9 and the second air cavity 10, the pyrolysis characteristic gas optical signal processing system and the fire characteristic gas optical signal processing system respectively process the detection information of the two types of gas, and the processed information is transmitted to the intelligent data decision system;
s3: and the intelligent data decision system judges whether fire disaster occurs or not from two paths according to the received processing information, namely when the time interval is shortened after pyrolysis characteristic gas is detected for the first time and then two continuous detections are carried out, and when pyrolysis characteristic gas still exists or when pyrolysis characteristic gas is not detected but fire disaster characteristic gas exceeding concentration limit is detected, a signal is sent to an early warning device to carry out acousto-optic early warning, and meanwhile, gas concentration information and ignition position information are sent to a background control end.
The foregoing is only illustrative of the present invention and is not to be construed as limiting thereof, but rather as various modifications, equivalent arrangements, improvements, etc., within the spirit and principles of the present invention.
Claims (10)
1. The ELDS-based early detection device for the fire disaster of the heat insulation material is characterized by comprising an air suction device (1) and a detection device (2), wherein an air delivery pipe (3) is arranged between the air suction device (1) and the detection device (2),
the air suction device (1) comprises a cavity (4), a plurality of air inlet pipes (5) are arranged on the cavity (4), and an air suction pump (6) is further arranged in the cavity (4) between the air inlet pipes (5) and the air delivery pipe (3);
the detection device (2) comprises a shell (7), a high polymer film (8) and a characteristic gas detection and data processing device are arranged in the shell (7), the high polymer film (8) divides the interior of the shell (7) into a first gas cavity (9) and a second gas cavity (10), gas outlet pipes (11) are respectively arranged on the first gas cavity (9) and the second gas cavity (10),
the characteristic gas detection and data processing device comprises a self-calibration system, a gas concentration detection system, an optical signal processing system and an intelligent data decision system (22).
2. The ELDS-based heat insulation material fire early detection device according to claim 1, wherein filter screens (12) are arranged in the air inlet pipe (5), the air delivery pipe (3) and the air outlet pipe (11), and the filter screens (12) are micron-sized filter screens.
3. The ELDS-based insulation material fire early detection device according to claim 1, wherein the polymer film (8) is a uniform film made of an organic polymer, and both sides thereof are respectively provided with metal mesh-shaped spacers (21).
4. The ELDS-based insulation fire early detection device of claim 1, wherein the self-calibration system comprises a built-in mirror (13) and a detection unit (14).
5. The ELDS-based insulation material fire early detection device according to claim 4, wherein the gas concentration detection system comprises a first laser emitter group (15) and a second laser emitter group (16), the first laser emitter group (15) and the second laser emitter group (16) are respectively arranged inside the first gas cavity (9) and the second gas cavity (10), a laser diode for detecting pyrolysis characteristic gas is arranged in the first laser emitter group (15), and a laser diode for detecting fire characteristic gas is arranged in the second laser emitter group (16).
6. The ELDS-based insulation fire early detection device of claim 5, wherein the light signal processing system comprises a scattered light signal processing system (17), a pyrolysis characteristic gas optical signal processing system (18) and a fire characteristic gas optical signal processing system (19) disposed within the housing (7).
7. The ELDS-based insulation fire early detection device according to claim 6, wherein an audible and visual alarm (20) is arranged outside the housing (7).
8. The ELDS-based insulation fire early detection device according to claim 1, wherein the housing (7) is made of a metallic material.
9. The ELDS-based insulation fire early detection device according to claim 1, characterized in that the laser transmitter set of the first side air chamber (9) is dimensioned as follows:
wavelength of outgoing laser: 7-12 μm;
energy: 2320mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
The specification of the laser emitter group of the second air cavity (10) is as follows:
wavelength of outgoing laser: 4.2-4.6 μm;
energy: 1075mJ
Single laser pulse duration: 20ns
Repetition frequency: 10Hz
Based on lambert-beer law, after single frequency radiation light passes through the gas to be detected, the relation between the light intensity and the gas concentration is as follows:
I(ν)＝I 0 (ν)exp[-σ(ν)cL]
σ(ν)＝Sφ(ν)
I 0 (v) -the intensity of the light before absorption of the gas;
sigma (v) -gas absorption cross section, representing the absorption profile of a gas at a single frequency of radiation;
l-absorption path length;
c-gas concentration;
s-molecule absorption line is strong and is related to temperature;
phi (v) -absorption linear function.
10. An ELDS-based early detection method for fire of thermal insulation material, which is based on the early detection device for fire of thermal insulation material of any one of claims 1 to 9, and is characterized by comprising the following steps:
s1: the air suction device 1 absorbs smoldering fire gas in the protection area, and characteristic gas sequentially enters the first air cavity (9) and the second air cavity (10) through polymer film separation;
s2: the first laser emitter group (15) and the second laser emitter group (16) in the gas concentration detection system respectively detect the gas in the first gas cavity (9) and the second gas cavity (10), and the pyrolysis characteristic gas optical signal processing system (18) and the fire characteristic gas optical signal processing system (19) respectively process the detection information of the two types of gas and transmit the processing information to the intelligent data decision system (22);
s3: the intelligent data decision system (22) respectively judges whether fire disaster occurs from two paths according to the received processing information, namely when the time interval is shortened after pyrolysis characteristic gas is detected for the first time and then two continuous detections are carried out, and when pyrolysis characteristic gas still exists or pyrolysis characteristic gas is not detected but fire disaster characteristic gas exceeding concentration limit is detected, a signal is sent to an early warning device to carry out acousto-optic early warning, and meanwhile gas concentration information and ignition position information are sent to a background control end.
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