CN104459817B - Fire sign detection device and method - Google Patents
Fire sign detection device and method Download PDFInfo
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- CN104459817B CN104459817B CN201410783688.5A CN201410783688A CN104459817B CN 104459817 B CN104459817 B CN 104459817B CN 201410783688 A CN201410783688 A CN 201410783688A CN 104459817 B CN104459817 B CN 104459817B
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Abstract
The invention provides a fire sign detection device and method. The device comprises a shell, a shading hood, a suction fan, a master control unit and a detection assembly. The suction fan, the master control unit and the detection assembly are arranged in the shell, the suction fan is located at a suction inlet of an upper cover, the input end of the suction fan is connected with a fan control output end of the master control unit, a detection chamber of a maze structure is disposed in the inner space of the shell, the detection assembly arranged in the detection chamber comprises a light source module and a scatter receiving detection amplifier circuit module, the light source module comprises two emitting tubes and two collimating lenses, and the input ends of the two emitting tubes are connected with the light source control output end of the master control unit. Multi-information synthesis detection is combined with a sunk detection light path structure of special design so that sensitive detection of micro sign information in the pyrolysis process in a fire breeding stage can be achieved, meanwhile, categories of pyrolysis particles with different attributes are judged, early sign detection is achieved, and meanwhile reliability of a detector is greatly improved.
Description
Technical field
The invention belongs to fire sign Detection Techniques field is and in particular to a kind of fire sign detection device and method.
Background technology
The fire that electrically reason leads to proportion in fire incident over the years is up to a quarter, and therefore electric fireproof is
The most important thing in security against fire, particularly all kinds of power distribution cabinets, switch cubicle, switch board etc., carry electric energy transmission ＆ distribution or signal is determined
The important function such as plan, carries out the practical demand that fire early detection is always in keeping the safety in production to such cabinet type control panel, right
Fire preventing, protect people's lives and properties, avoid huge economic losses significant.
In all kinds of cabinet type control panels, although existing excessively stream or residual current monitoring and protecting device trouble saving occur,
But because heating hidden danger is not only to be caused by excessively stream or residual current, instrument in loose contact, line footpath erroneous matching and equipment
The many factors such as table direct current weak current part short circuit lead to conductor abnormal heating, and fault type various is so that existing electric fire
Calamity monitoring system highlights the deficiency of protective capability, is therefore extremely necessary to carry out from the angle of fire detecting and alarm cabinet type automatically controlled
The fire early stage sign pre-alarm and prevention of equipment, develops and provides fire to breed pyrolysis phase and targetedly protect for such place.
Fire breeds the possible product of stage pyrolytic process and phenomenon includes cigarette, temperature, gas three major types sign type, according to heat
The difference of solution combustible, above-mentioned three class products and phenomenon or it may happen that or do not occur to grind it is therefore desirable to carry out correlation test
Study carefully, determine protection of goal place effective fire sign, and set up the experimental simulation method of this effective fire sign, finally to spy
The possible Detection Techniques surveying this sign carry out the assessment of technique direction, for sign detector exploitation provide directivity suggestion with
And the support of correlation sign characteristic rule data.
The purpose developing fire sign detector is that offer fire breeds the early warning protective capability in stage, therefore highly sensitive
Detection method is the link having to initially set up, to realize fire bred the quick of small prognostic information in stage pyrolytic process
Sense detects.However, faint due to prognostic information, therefore it is easy to together with present in environment, chaff interference floods, Gao Ling
Quick detection then may lead to the misinformation probability of sign detector to be in some cases enhanced, and sign detector is that highly sensitive sign is special
Levy implementing of attribute identification Detection Techniques, the type selecting of Primary Component, the design of recognizer, the design of Circuits System with change
Enter, the cooperation of the optimization of light path and each structure member is required on stream constantly this mistake of retest analysis and regulation
Journey.
Content of the invention
It is an object of the invention to provide a kind of fire sign detection device and method.
The technical scheme is that
A kind of fire sign detection device, comprising: housing, shade, suction fan, main control unit and probe assembly；
Housing includes lid and bottom seat, and suction fan, main control unit and probe assembly are arranged at lid and are fastened with base
In the housing being formed, Shang Gai center has Suction gas inlet, and the suction inlet of upper lid installs shade；
Main control unit is fixed on base position；Suction fan is located at the suction inlet of upper lid, and the input of suction fan is even
Connect the air-blower control outfan of main control unit；
The detecting chamber of labyrinth structure is set in enclosure interior space, and in detecting chamber, setting probe assembly includes visiting for transmitting
The light source module of light-metering bundle and the scattering for receiving through detecting the scattered signal that light beam irradiates generation receive and detect amplifying circuit
Module；
Light source module includes two transmitting tubes and two collimating lens, and the input of two transmitting tubes connects master control list respectively
The light source control outfan of unit.
Described scattering receives detection amplification circuit module and includes three light sensors and three detection amplifying circuits；Each light
The outfan of dependent sensor connects each detection input amplifier respectively, and each amplification circuit output end that detects connects master control respectively
Cell signal input.
Described light source module and scattering receive and detect amplification circuit module and be arranged on base using connecting and fixing mode.
Described detect interior be provided with for multiple reflections absorb not entirely collimated paraxonic veiling glare multiple emergent pupil diaphragm,
Photosensitive area and delustring ligh trap；
After multiple emergent pupil diaphragm is located at collimating lens；Emergent pupil diaphragm adopts 30 ° of designs of sharp comer；
Photosensitive area is the ground of the beam intersection that the smoke particle in gas is sent by the passage of detecting chamber and light source module
Side, photosensitive area is in cylinder；Light source module, scattering receive and detect amplification circuit module, delustring ligh trap is distributed in around photosensitive area
On one sphere；
Delustring ligh trap is optical trap, using the design of optics dead space, through repeatedly anti-after light entrance delustring ligh trap
Dead band is entered after penetrating；
Light source module is symmetrical with delustring ligh trap, forms source plane, and forward direction light sensor is arranged in delustring ligh trap
Side, backward light sensor is arranged in light source module side.
Described housing adopts abs engineering plastics, and the inner surface of housing applies shielding metal foil film isolation outside electromagnetic interference.
Described light sensor adopts sunk type to design, and its setting angle becomes space angle, light sensor with transmitting light beam
The mounting plane of device is less than source plane.
Brake sack is set between photosensitive area and suction fan.
The method carrying out fire sign detection using described fire sign detection device, comprises the following steps:
Step 1: main control unit controls suction fan to carry out air-breathing to detecting gas in environment, and gas enters through Suction gas inlet
The detection entering housing is indoor；
Step 2: main control unit controls two transmitting tubes to send light every Fixed Time Interval with different emission mode orders
Bundle, light beam enters photosensitive area after collimating lens, and not entirely collimated paraxonic veiling glare is by adjacent emergent pupil diaphragm multiple reflections
Absorb；
Three kinds of different emission modes are as follows:
1: one transmitting tube of emission mode launches 50 milliseconds of light beams；
Emission mode 2: another transmitting tube launches 50 milliseconds of light beams；
3: two transmitting tubes of emission mode launch 50 milliseconds of light beams simultaneously；
Step 3: light beam, during photosensitive area, if particle containing fire-breeding in gas, scatters；
Step 4: three light sensors receive the light beam that scattering occurs, and delustring ligh trap absorbs collimated light beam, not by delustring
The through hole through delustring ligh trap for the collimated light beam that ligh trap absorbs is blocked cover after projecting and absorbs；
Step 5: three light sensors receive the scattered light signal that fire sign particle is subject to transmitting light beam irradiation to produce
Main control unit is reached after amplifying through photodetection amplifying circuit；
Step 6: main control unit calculates the scattered light background increment that three light sensors under different emission modes receive；
Step 7: calculate the ratio of each scattered light background increment that lower three light sensors of each emission mode receive respectively
Kij, obtains the interval of kij value, and the interval of kij value is corresponding with the variety classes fire sign particle of acquisition of sampling in advance
The standard of kij value is interval to be compared: if the interval of kij value falls into certain standard interval, contains this standard interval right in current gas
The fire sign particle answered, this fire sign particle determines that the current environment that detects whether there is fire sign.
Described emission mode includes:
1: one transmitting tube of emission mode launches 50 milliseconds of light beams；
Emission mode 2: another transmitting tube launches 50 milliseconds of light beams；
3: two transmitting tubes of emission mode launch 50 milliseconds of light beams simultaneously.
Described fire sign particle is dust, vapor particle, diesel particulate, pvc are pyrolyzed particle or thermal decomposition of wood particle.
Beneficial effect:
By using multi information complex probe with reference to unique design sunk type detect light channel structure realize pregnant to fire
Educate the sensitive detection of small prognostic information in stage pyrolytic process, the classification simultaneously realizing being pyrolyzed particle to different attribute is sentenced
Disconnected, realize greatly improving the reliability of detector while early stage sign detects.
Brief description
Fig. 1 is the fire sign detection principle schematic diagram of the specific embodiment of the invention；
Fig. 2 is the fire sign detection device overall structure diagram of the specific embodiment of the invention, wherein, 1- covers,
2- probe assembly, 3- base；
Fig. 3 is the detecting chamber internal structure rough schematic view of the specific embodiment of the invention；
Fig. 4 is the emergent pupil diaphragm section three dimensional structure diagram of the specific embodiment of the invention；
Fig. 5 is the delustring ligh trap section three dimensional structure diagram of the specific embodiment of the invention；
Fig. 6 is the light sensor sunk type design structure profile of the specific embodiment of the invention；
Fig. 7 is the detection amplifying circuit schematic diagram of the specific embodiment of the invention；
Fig. 8 is the fire sign detection method flow chart of the specific embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is elaborated.
Corresponding conclusion to Detection Techniques Study on selection, the fire of protection of goal place typical case's combustible are determined by fire sign
Calamity early stage sign is pyrolysis particle, and pyrolysis particle is a kind of particulate in itself, therefore can be entered by light scattering technique
Row detects.Sign detection principle, as shown in figure 1, irradiating pyrolysis particle ingress area by a light source, be not pyrolyzed particle
In the case of, light straightline propagation, and when there being pyrolysis particle, due to microgranule to scattering of light effect so that except straightline propagation
Other directions beyond direction there has also been scattered light, by scattered light is collected with sensing analysis, can complete to sign
Detect.
Fire sign is a kind of Weak Information it is therefore desirable to highly sensitive Detection Techniques.Realized based on light scattering principle
What sign detected it is critical only that raising has scattered light intensity during pyrolysis particle to receive with electrooptical device when being no pyrolyzed particle
Signal to noise ratio between the background light radiation intensity arriving, keeps the ga s safety degree of dissimilar KPT Scatter light characteristic simultaneously, for
Attribute identification.
Point detector can position fire and position occurs when constituting automatic fire alarm system, and for being intended to fire
For the stage of breeding sends the sign detector of early warning, the stationkeeping ability that point-type version provides contributes to quick handling failure
Equipment, it is to avoid the process that hidden danger position troubleshooting procedure causes leads to the appearance of bigger loss not in time.Air suction type structure can
More stable turnover smoke performance is provided, can effectively reduce the jitter that point-type structure is caused by flue gas natural diffuseness mode
Impact.To sum up, for meeting actual demand, the optimal design of the panel detector structure of present embodiment should be the point possessing getter capacity
Type structure.
According to scattering theory, the scattered field that different single particles produces when scattering to light is different, for grain
For subgroup, if the distance between particle is much larger than particle diameter, the scattered field of population is similar to each single particle
The superposition of scattered field, therefore can realize attribute identification by measuring the scattered field of population.
A kind of fire sign detection device, as shown in Figure 2, comprising: housing, shade, suction fan, main control unit and spy
Survey assembly 2；
Housing adopts abs engineering plastics, and the inner surface of housing applies shielding metal foil film isolation outside electromagnetic interference.
Housing includes lid 1 and base 3, and suction fan, main control unit and probe assembly 2 are arranged at lid and base button
Close in the housing being formed, Shang Gai center has Suction gas inlet, the suction inlet of upper lid 1 installs shade.
Main control unit adopts c8051f410 chip.C8051f410 is the modulus mixed class chip of c51 kernel, with wide
General.Analog acquisition, warning computing, the function such as communication can be conveniently accomplished based on this chip, both improved to simplifying circuit design
The stability aspect that whole system is run is highly beneficial.Reset first various functions depositor after electricity on detector, and close
Disconnected.Encoded using flash storage address on piece, in addition, some the required significant datas in work process also store
In the middle of flash.The detector working environment that different environment and different operating modes cause is different, therefore over time
Change, the scattered light background increment size of light sensor may rise and fall, for this reason, it may be necessary to the renewal background of stage.Examine
Consider environmental working condition can not possibly be mutated, the background valuess period of change of light sensor analog quantity be significantly larger than because pyrolysable particles or its
He disturbs the analog quantity period of change that particle causes, and therefore background is followed and is set to much larger than spy the interrupt cycle of floating intervalometer
Survey the interrupt cycle of intervalometer.Locally follow at one and in the floating cycle, comprise a series of detection cycles.
Main control unit is fixed at base 3；Suction fan is located at the suction inlet of upper lid 1, the input of suction fan
Connect the air-blower control outfan of main control unit；
The detecting chamber of labyrinth structure is set in enclosure interior space, and in detecting chamber, setting probe assembly includes visiting for transmitting
The light source module of light-metering bundle and the scattering for receiving through detecting the scattered signal that light beam irradiates generation receive and detect amplifying circuit
Module；Light source module and scattering receive and detect amplification circuit module and installed on the base 3 using connecting and fixing mode.
Light source module includes two transmitting tubes and two collimating lens, and the input of two transmitting tubes connects master control list respectively
The light source control outfan of unit.
Scattering receives detection amplification circuit module and includes three light sensors and three detection amplifying circuits；Each photosensitive biography
The outfan of sensor connects each detection input amplifier respectively, and each amplification circuit output end that detects connects main control unit respectively
Signal input part.
As far as possible the veiling glare of non-pyrolytic granule scattering is filtered or completely cut off outside light sensor, be to realize high letter
Make an uproar ratio detect a necessary and sufficient condition, be also technological difficulties realizing highly sensitive detection.For this reason, present embodiment is carried out
For the optimization design of light path, it is finally obtained the detecting chamber of a function admirable.As shown in figure 3, detecting interior to be provided with use
Absorb multiple emergent pupil diaphragm, photosensitive area and the delustring ligh trap of not entirely collimated paraxonic veiling glare in multiple reflections；Photosensitive area with
Brake sack is set between suction fan, and suction fan is fixedly arranged at the front end with filter.
In view of the technology of semiconductor laser diode is highly developed and cheap, volume is small, therefore this embodiment party
Formula adopts laser diode as transmitting tube.The laser that semiconductor laser diode is sent is Gaussian beam, different from He-Ne
Laser instrument, its angle of divergence is wider, and the typical angle of divergence is in θ⊥=± 10 °, θ||=± 20 ° about, if being directly used in detector light
Road, has and greatly cannot be introduced into ligh trap, but cause the veiling glare of multiple reflections in detector, for this reason, in quasiconductor
Devise collimating lens before laser beam, at the laser excitation of semiconductor laser diode, be arranged on the focal point of collimating lens.
Collimating lens are divided into non-spherical lens and two kinds of spherical lenss, and the difficulty of processing of wherein non-spherical lens is higher, standardization level
Low, but can will be travelling through strictly collimating from the light of focus.And spherical lenss have a large amount of standard specificationss to be available for purchasing, difficulty of processing
Low, cheap, but cannot accomplish entirely collimated for the light with optical axis being in wide-angle, it is still to dissipate after lens outgoing
Shape.In view of the mobility of engineering processing and manufacturing, using spherical lenss collimating fashion, the part collimation performance of sacrifice is passed through to set
Count multiple emergent pupil diaphragm to make up.After multiple emergent pupil diaphragm is located at collimating lens；Emergent pupil diaphragm adopts 30 ° of designs of sharp comer,
As shown in figure 4, not entirely collimated paraxonic veiling glare will be absorbed by adjacent emergent pupil diaphragm multiple reflections, diaphragm periphery is using sharp
Angle is designed, and can avoid filtering the secondary light pollution causing during veiling glare, substantially increase the collimation property of emergent pupil laser beam.
Photosensitive area is the ground of the beam intersection that the smoke particle in gas is sent by the passage of detecting chamber and light source module
Side, photosensitive area is in cylinder；Light source module, scattering receive and detect amplification circuit module, delustring ligh trap is distributed in around photosensitive area
On one sphere.
In order to ensure no in the state of pyrolysable particles, all laser exit pupil beam are absorbed as far as possible so that light sensor
The detecting chamber background light intensity that device receives is lower, devises the delustring ligh trap shown in Fig. 5, and delustring ligh trap is optical trap, adopts
With the design of optics dead space, after light entrance delustring ligh trap, enter dead band after multiple reflections；Ligh trap is designed as low-angle
Taper, cone leaves micro-through-hole, and so most parallel rayies are inhaled in low-angle taper after conical surface multiple reflections
Receive, small part non-reflected light axial ray and the light that do not fully absorbed project via through hole, it is to avoid because of blind hole
And lead to some light to be reflected back toward the problem of photosensitive area.
Most detectors based on light scattering principle, all expanding the receipts optical range of light sensor as far as possible,
So that all of scattered light is all received by light sensor.But this is done so that the light scattering field energy of particle is mixed to be superimposed upon
Together it is impossible to realize the differentiation of particle property.In addition, also increasing contaminated area, for a long time for receiving the reflecting mirror of light collocation
Run lower detector response performance and because of minute surface laying dust, drift can occur.For this reason, detecting cell structure, light source, light sensor, spy
On the premise of survey amplifying circuit cooperation optimizes to ensure detectivity, it is that light sensor devises low-angle receipts optical channel.
So that other angle scattered lights outside receiving optic angle θ ± 10 ° scope cannot reach light sensor it is ensured that particle property is known
The accuracy of laser light scattering angular positioning when other.Although in addition, low-angle multiple emergent pupil diaphragm makes to reach light sensor
The light total amount of device reduces, but also inhibits smokeless in the case of from other side walls reflection veiling glare so that light sensor this
Bottom output also reduces accordingly, compensate for a certain extent collecting the few deficiency of scattered light total amount.In addition, light sensor connects
The portion of receiving is placed in below detecting chamber, between detecting chamber and base, this sunk type design, it is to avoid when multi-angle receives
Multiple light-sensitive devices are in and stop among darkroom that the situation of flue gas diffusion occurs.
Light source module is symmetrical with delustring ligh trap, forms source plane, and forward direction light sensor is arranged in delustring ligh trap
Side, backward light sensor is arranged in light source module side.As shown in fig. 6, light sensor adopts sunk type to design, its peace
Dress angle becomes space angle with transmitting light beam, and the mounting plane of light sensor is less than source plane.
Light sensor is all placed in below the plane of 2 transmitting tube compositions of detecting chamber, this sunk type design, it is to avoid
When multiple photosensitive tubes receive scattered light simultaneously multiple light-sensitive devices be among darkroom stop flue gas diffusion result in unfavorable
Detection angle, when detector normal work be ensure that using the angle that detection sensor is tiltedly installed down simultaneously, the powder of in the air
Grit will not fall sensor surface due to the impact of gravity, substantially increases the reliability of detector.
The light sensor that present embodiment adopts is light sensitive diode.Light sensitive diode, in the case of having light, can produce
Raw weak current, if light sensitive diode is reverse-biased, this weak current also can be exaggerated, and the size of weak current and reception
The luminous power arriving is proportional.Therefore, the scattering optical detection based on light sensitive diode is it is necessary to a detection amplifying circuit.
It is found through experiments, the scattered energy that below 0.8%obs/m concentration pyrolysable particles produce is extremely small, in light sensor
In the case of 0.01sr solid angle receives light, the luminous power receiving is only 10-10～10-9W rank, for current photoelectric transformation efficiency
10-1The light sensor of a/w magnitude, its output current is only 10-11～10-10a.Generally, current signal is all turned
It is changed to voltage signal to amplify, for this reason, devising Trans-impedance preamplifier, realizing i/v conversion and amplifying, as shown in Figure 7.But, right
For current ad transducer, at least need to be amplified to mv magnitude, be only possible to reliable measurements, if putting before therefore using one-level
Big device, then feedback resistance rfAt least need 1g ω.But the time constant that the feedback resistance of 1g ω brings is huge, step response time
Reach second level, for this reason, reducing prime amplification, using two-stage amplifying circuit, final amplification is r1r8/r5.For
Amplifying circuit, the selection of amplifier is most important, and for small current signal measurement, the input bias current of amplifier is with offset voltage all
Must be very little, opa2340 is a precision operational-amplifier, and its input bias current representative value is 0.2pa, less than photosensitive biography
The photoelectric current output of sensor, and offset voltage is even more and is less than 2.5 μ v, applies it as the core amplifier detecting in amplifying circuit.
The method carrying out fire sign detection using fire sign detection device, as shown in figure 8, comprising the following steps:
Step 1: main control unit controls suction fan to carry out air-breathing to detecting gas in environment, and gas enters through Suction gas inlet
The detection entering housing is indoor；
Step 2: main control unit controls two transmitting tubes to send light every Fixed Time Interval with different emission mode orders
Bundle, light beam enters photosensitive area after collimating lens, and not entirely collimated paraxonic veiling glare is by adjacent emergent pupil diaphragm multiple reflections
Absorb；
Three kinds of different emission modes are as follows:
1: one transmitting tube of emission mode launches 50 milliseconds of light beams；
Emission mode 2: another transmitting tube launches 50 milliseconds of light beams；
3: two transmitting tubes of emission mode launch 50 milliseconds of light beams simultaneously；
Fixed Time Interval is t0=30 (ms) millisecond
Launching sequential is, 1；t0；2；t0；3；t0；The time delay interval of 760 (ms) millisecond；
1；t0；2；t0；3；t0；The time delay interval of 760 (ms) millisecond；
Step 3: light beam, during photosensitive area, if particle containing fire-breeding in gas, scatters；
Step 4: three light sensors receive the light beam that scattering occurs, and delustring ligh trap absorbs collimated light beam, not by delustring
The through hole through delustring ligh trap for the collimated light beam that ligh trap absorbs is blocked cover after projecting and absorbs；
Step 5: three light sensors receive the scattered light signal that fire sign particle is subject to transmitting light beam irradiation to produce
Main control unit is reached after amplifying through photodetection amplifying circuit；
Step 6: main control unit calculates the scattered light background increment that three light sensors under different emission modes receive；
Transmitting each time can receive 3 corresponding scattered light background increment sizes of sampling and be respectively as follows:
Emission mode 1:ad11；ad12；ad13；
Emission mode 2:ad21；ad22；ad23；
Emission mode 3:ad31；ad32；ad33；
Step 7: calculate the ratio of each scattered light background increment that lower three light sensors of each emission mode receive respectively
Kij, obtains the interval of kij value, and the interval of kij value is corresponding with the variety classes fire sign particle of acquisition of sampling in advance
The standard of kij value is interval to be compared: if the interval of kij value falls into certain standard interval, contains this standard interval right in current gas
According to this fire sign particle, the fire sign particle answered, determines that the current environment that detects whether there is fire sign.
Ad12/ad11=k121；
Ad13/ad11=k131；
Ad22/ad21=k221；
Ad23/ad21=k231；
Ad32/ad31=k321；
Ad33/ad31=k331；
Fire sign particle is dust, vapor particle, diesel particulate, pvc are pyrolyzed particle or thermal decomposition of wood particle.
Sample in advance acquisition the corresponding kij value of variety classes fire sign particle as follows:
Dust:
Ad12/ad11=k121 (2)；
Ad13/ad11=k131 (5)；
Ad22/ad21=k221 (8)；
Ad23/ad21=k231 (1.2)；
Ad32/ad31=k321 (7)；
Ad33/ad31=k331 (6).
The standard interval of dust corresponding kij value is: [1.2,8].
Vapor particle:
Ad12/ad11=k121 (6)；
Ad13/ad11=k131 (3)；
Ad22/ad21=k221 (4)；
Ad23/ad21=k231 (3)；
Ad32/ad31=k321 (4)；
Ad33/ad31=k331 (1).
The standard interval of vapor particle corresponding kij value is: [1,6].
Diesel particulate:
Ad12/ad11=k121 (11)；
Ad13/ad11=k131 (5)；
Ad22/ad21=k221 (5)；
Ad23/ad21=k231 (6)；
Ad32/ad31=k321 (7)；
Ad33/ad31=k331 (9).
The standard interval of diesel particulate corresponding kij value is: [5,11].
Pvc pyrolysis particle:
Ad12/ad11=k121 (1)；
Ad13/ad11=k131 (5)；
Ad22/ad21=k221 (2)；
Ad23/ad21=k231 (6)；
Ad32/ad31=k321 (2)；
Ad33/ad31=k331 (3).
The standard interval that pvc is pyrolyzed particle corresponding kij value is: [1,6].
Thermal decomposition of wood particle:
Ad12/ad11=k121 (2)；
Ad13/ad11=k131 (3)；
Ad22/ad21=k221 (2)；
Ad23/ad21=k231 (4)；
Ad32/ad31=k321 (7)；
Ad33/ad31=k331 (3).
The standard interval of thermal decomposition of wood particle corresponding kij value is: [2,7].
Claims (8)
1. a kind of fire sign detection device, comprising: housing, shade, suction fan, main control unit and probe assembly；
Housing includes lid and bottom seat, and suction fan, main control unit and probe assembly are arranged at lid and fasten formation with base
Housing in, Shang Gai center has a Suction gas inlet, and the suction inlet of upper lid installs shade；
Main control unit is fixed on base position；Suction fan is located at the suction inlet of upper lid, and the input of suction fan connects master
The air-blower control outfan of control unit；
The detecting chamber of labyrinth structure is set in enclosure interior space, and in detecting chamber, setting probe assembly is included for emission detection light
The light source module of bundle and the scattering for receiving through detecting the scattered signal that light beam irradiation produces receive and detect amplification circuit module；
Light source module includes two transmitting tubes and two collimating lens, and the input of two transmitting tubes connects main control unit respectively
Light source control outfan；
It is characterized in that, described detection interior is provided with reppears for not entirely collimated paraxonic veiling glare of multiple reflections absorption more
Pupil diaphragm, photosensitive area and delustring ligh trap；
After multiple emergent pupil diaphragm is located at two collimating lens；Emergent pupil diaphragm adopts 30 ° of designs of sharp comer；
Photosensitive area is the place of the beam intersection that the smoke particle in gas is sent by the passage of detecting chamber and light source module, light
Quick area is in cylinder；Light source module, scattering receive and detect amplification circuit module, delustring ligh trap is distributed in a ball around photosensitive area
On face；
Delustring ligh trap is optical trap, using the design of optics dead space, after light entrance delustring ligh trap after multiple reflections
Enter dead band；
Light source module is symmetrical with delustring ligh trap, forms source plane, and forward direction light sensor is arranged in delustring ligh trap side,
Backward light sensor is arranged in light source module side.
2. fire sign detection device according to claim 1 detects amplifying circuit it is characterised in that described scattering receives
Module includes three light sensors and three detection amplifying circuits；The outfan of each light sensor connects each detection respectively and puts
Big circuit input end, each amplification circuit output end that detects connects main control unit signal input part respectively.
3. fire sign detection device according to claim 1 is it is characterised in that described light source module receives spy with scattering
Survey amplification circuit module use connects and fixes mode and is arranged on base.
4. fire sign detection device according to claim 1 it is characterised in that described housing adopt abs engineering plastics,
The inner surface of housing applies shielding metal foil film isolation outside electromagnetic interference.
5. fire sign detection device according to claim 1 is it is characterised in that described light sensor adopts sunk type
Design, its setting angle becomes space angle with transmitting light beam, and the mounting plane of light sensor is less than source plane.
6. fire sign detection device according to claim 1 is it is characterised in that set between photosensitive area and suction fan
Put brake sack.
7. the method carrying out fire sign detection using the fire sign detection device any one of claim 1-6, its
It is characterised by: comprise the following steps:
Step 1: main control unit controls suction fan to carry out air-breathing to detecting gas in environment, and gas enters shell through Suction gas inlet
The detection of body is indoor；
Step 2: main control unit controls two transmitting tubes to send light beam, light every Fixed Time Interval with different emission mode orders
Bundle enters photosensitive area after collimating lens, and not entirely collimated paraxonic veiling glare is absorbed by adjacent emergent pupil diaphragm multiple reflections；
Three kinds of different emission modes are as follows:
1: one transmitting tube of emission mode launches 50 milliseconds of light beams；
Emission mode 2: another transmitting tube launches 50 milliseconds of light beams；
3: two transmitting tubes of emission mode launch 50 milliseconds of light beams simultaneously；
Step 3: light beam, during photosensitive area, if particle containing fire-breeding in gas, scatters；
Step 4: three light sensors receive the light beam that scattering occurs, and delustring ligh trap absorbs collimated light beam, not by delustring ligh trap
The through hole through delustring ligh trap for the collimated light beam absorbing is blocked cover after projecting and absorbs；
Step 5: three light sensors receive fire sign particle and are subject to transmitting light beam to irradiate the scattered light signal producing through light
Electrical resistivity survey is surveyed after amplifying circuit amplifies and is reached main control unit；
Step 6: main control unit calculates the background increment that three light sensors under different emission modes receive；
Step 7: calculate the ratio kij of each background increment that lower three light sensors of each emission mode receive respectively, obtain kij value
Interval, will the interval of kij value and the corresponding kij value of variety classes fire sign particle of acquisition of sampling in advance standard interval
Compare: if the interval of kij value falls into certain standard interval, in current gas, contain the interval corresponding fire sign grain of this standard
Son, this fire sign particle determines that the current environment that detects whether there is fire sign.
8. fire sign detection method according to claim 7 it is characterised in that: described fire sign particle be dust,
Vapor particle, diesel particulate, pvc pyrolysis particle or thermal decomposition of wood particle.
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| CN108205867B (en) * | 2017-12-25 | 2021-03-09 | 中国科学技术大学 | Early fire smoke detection method with interference particle recognition capability |
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| CN111973926A (en) * | 2020-08-12 | 2020-11-24 | 珠海格力电器股份有限公司 | Kitchen fire processing method, device and system and range hood |
| CN112466084B (en) * | 2020-11-25 | 2022-02-15 | 江苏中实电子有限公司 | Electrical fire monitoring detector and alarm method thereof |
| CN113538838B (en) * | 2021-07-22 | 2022-12-06 | 应急管理部沈阳消防研究所 | Electrical fire monitoring method for identifying pyrolytic particle characteristics of cultural relics and buildings |
| CN115311835B (en) * | 2022-08-08 | 2024-04-16 | 无锡商业职业技术学院 | Multi-current scanning-based smoke detection method of photoelectric smoke detector |
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