CN104637234A - Smoke detector certification device and calibration method based on laser light scattering measurement principle - Google Patents
Smoke detector certification device and calibration method based on laser light scattering measurement principle Download PDFInfo
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- CN104637234A CN104637234A CN201510071829.5A CN201510071829A CN104637234A CN 104637234 A CN104637234 A CN 104637234A CN 201510071829 A CN201510071829 A CN 201510071829A CN 104637234 A CN104637234 A CN 104637234A
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- photoelectric sensor
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
- G08B17/107—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device for detecting light-scattering due to smoke
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
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Abstract
The invention provides a smoke detector certification device based on a laser light scattering measurement principle. The smoke detector calibrating device comprises a certification instrument and a calibration instrument, wherein the certification instrument comprises a certification instrument processing circuit, a measurement cavity 14 and a first photoelectric sensor 13, the measurement cavity is provided with a first transparent window 20 and a second transparent window 21, and the calibrationinstrument comprises a second photoelectric sensor 17 and a trigger 18; a measurement beam 23 is incident from the first transparent window and exits from the second transparent window; the first photoelectric sensor 13 is used for detecting the light intensity of a scattered beam formed in a way that the detected smoke is scattered; the second photoelectric sensor 17 is used for detecting the light intensity of a transmitted beam which is formed by passing through the detected smoke and exits from the second transparent window; the trigger is used for synchronously triggering the first photoelectric sensor and the second photoelectric sensor. According to the smoke detector certification device, a calibration scheme of synchronously triggering the first photoelectric sensor and the second photoelectric sensor at high speed is adopted, so that the difficulty of no standard smoke sample is solved.
Description
Technical field
The present invention relates to a kind of calibrating installation of smoke detector, be specifically related to a kind of smoke detector calibrating installation based on laser defusing measure principle and scaling method.
Background technology
For dissimilar and fire that is different phase, the sensing technology of being used widely has: combustible gas component, the thermal source of infrared type detection of fires, the ultraviolet light of ultraviolet type detection of fires association of the release of gas-sensitive type induction fire, and ion-type induction fire hazard aerosol fog particle is to ionizing the interference of subfield, the particle concentration of photoelectric type measurement fire hazard aerosol fog or smoke particle to the occlusion effect (being referred to as corpuscular type below) of light.Mine smoke sensor is the visual plant of mine safety production monitoring, and along with technical merit improves constantly, its leading position changes corpuscular type into by gas-sensitive type gradually.Especially need the occasion of early prevention fire failure, to glow dangerous higher position as monitored the adhesive tape mechanical friction, electric cable heating, spontaneous combustion of coal seam etc. of down-hole, the technical advantage of photoelectric sensing is more obvious, and it has a extensive future.
The mine smoke sensor examination criteria in past, what require to detect is smog mass concentration, and its shortcoming one is poor real, and two is that the measuring error of mass concentration and response time is large, and three is in testing process, and the control difficulty of smog mass concentration is large.Current, the core technology index of mine smoke sensor has been changed to shading rate (dimension is %obs/m).The restriction of examined equipment, is only evaluated the warning of smoke transducer under a certain concentration threshold at present and triggers, can not complete the calibrating of the arbitrary smokescope of gamut, also cannot be traced to the source by the calibrating benchmark Completion Techniques devise a stratagem amount of other industry.Therefore, Check and Inspection mechanism and manufacturing enterprise need the novel calibrating installation of gamut scope badly, for correctly passing judgment on the performance parameter of mine smoke sensor, promote the development of domestic independent research and development capacity.
Summary of the invention
Given this, the invention provides the scatter-type smoke detector calibrating installation and scaling method that do not need standard smog sample.
The object of the invention is by such technical scheme realize, based on the smoke detector calibrating installation of laser defusing measure principle, comprise calibrating instrument and marking apparatus, described calibrating instrument comprises calibrating instrument treatment circuit, is provided with measurement chamber 14 and first photoelectric sensor 13 of the first transparent window 20 and the second transparent window 21, and described marking apparatus comprises the second photoelectric sensor 17 and trigger 18; Measuring beam 23 is incident by the first transparent window, by the second transparent window outgoing after tested smog; Described first photoelectric sensor 13 is for detecting the light intensity of the scattered beam formed through tested smog scattering; Described second photoelectric sensor 17 is for detecting the light intensity of the transmitted light beam formed through tested smog; Described trigger synchronously triggers the first photoelectric sensor and the second photoelectric sensor.
Preferably, described first transparent window 20 and the second transparent window 21 are arranged at along the axis measuring chamber 14 both sides measuring chamber respectively; Described scattered beam is from the first transparent window outgoing, and described transmitted light beam is from the second transparent window outgoing;
Or the ring light electric transducer that described first photoelectric sensor and the second photoelectric sensor are integrated, described ring light electric transducer has inner ring surveyed area and outer shroud surveyed area, the light intensity of scattered beam is detected by outer shroud surveyed area, and the light intensity of transmitted light is detected by inner ring surveyed area.
Two of object of the present invention is to provide uses said apparatus to carry out the method for demarcating, and comprises the following steps:
1) aerosol producer produces smog, passes into and measure chamber after smog is relatively stable; Trigger exports pulse, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores;
2) regulate aerosol producer, change the concentration of smog, the output pulse of trigger randomness in the process, trigger the first photoelectric sensor and the second photoelectric sensor image data and store;
3) step 2 is repeated) repeatedly;
4) remove significant singular value in test data, paired data is fitted to curvilinear equation, and horizontal ordinate is scattered light power, and ordinate is transmitted optical power, determines the maximum deviation value of test data and matched curve;
5) curve coefficients is write in the program storage of smoke detector.
Preferably, in step 1) frontly also comprise steps A: described steps A is specially: the clean state keeping measuring chamber, start trigger output pulse signal, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores.
Owing to have employed technique scheme, the present invention has following advantage:
The present invention utilizes electronic synchronizer device high-speed synchronous to trigger the first photodetector of calibrating instrument and the second photodetector of marking apparatus, realize the synchronous acquisition to smog scattered light power and transmitted optical power, set up scattered light and transmitted light changes accurate funtcional relationship, overcoming in reality cannot the difficult problem of manufacturer's standard smog sample.During application smoke detector, according to the function established in advance, the transmitted optical power of smog by the scattered light power counter-calculation of surveying, thus obtain shading rate or the concentration of tested smog.The method has without the need to the advantage such as standard smog sample, timing signal smokescope be any, is applicable to the calibrating of scatter-type smoke transducer or staking-out work of dispatching from the factory.
Accompanying drawing explanation
In order to make the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail, wherein:
Fig. 1 is caliberating device composition frame chart;
Fig. 2 is calibrating instrument treatment circuit block diagram
Fig. 3 is aerosol producer structural representation;
Fig. 4 is backward type scatterometry and demarcates light path schematic diagram;
Fig. 5 is forward-type scatterometry and demarcates light path schematic diagram.
Embodiment
Below with reference to accompanying drawing, the preferred embodiments of the present invention are described in detail; Should be appreciated that preferred embodiment only in order to the present invention is described, instead of in order to limit the scope of the invention.
The suspension particulate that fire produces forms smog, and particle content is higher, then smokescope is higher, to light to block effect better, otherwise also set up.Therefore, adopt shading rate to weigh the height of smokescope, judge developing stage or the order of severity of fire.Mine smoke sensor accurately estimates smokescope with the shading rate of 1m thickness smog, and its mathematical definition is:
Wherein, S is shading rate, I
ifor input light intensity, I
ofor the transmitted light intensity through 1m thickness smog, T=I
0/ I
ifor transmittance.
The mensuration of calibrating installation shading rate obeys formula (1).Limit by volume, the smog thickness that calibrating installation measuring beam passes can not reach 1m, the shading rate of actual measurement need be calculated the shading rate of 1m thickness smog equivalence.Suppose that tested smokescope is lower and even, ignore the interaction between smoke particle, and adopt collimated monochromatic ligth vertical irradiation.According to langbobier law, the smog transmittance T of measuring beam
mbe respectively with its transmittance T passing the identical tested smog of 1m thickness:
Wherein, I
ilfor measuring beam input light intensity, I
olfor measuring beam transmitted light intensity, K is fume absorbent coefficient, and C is smoke particle concentration, and l is the thickness (unit: m) that measuring beam passes tested smog.Bring formula (2) into formula (3).Obtain:
Formula (4) is substituted into formula (1), then the shading rate of 1m thickness smog is:
At fire commitment, smokescope is lower, and smoke particle particle diameter mainly concentrates on few tens of nanometers scope
[5]if calibrating installation directly measures I
oland I
il, and calculating smokescope by formula (5), its measurement sensistivity is poor, error is larger.In fact, when a branch of collimated monochromatic ligth irradiates smoke particle, also scattering phenomenon will be there is.By the change of the change reflection smoke particle concentration of scattered light intensity, namely utilize the scattered light intensity I of measuring beam
slindicator transmitted light intensity I
ol, obtain high sensitivity, high-precision measurement result.Set up funtcional relationship accordingly:
I
ol＝f
-1(I
sl) (6)
In like manner, formula (6) is substituted into formula (5), and the formula (1) of unmodified is transformed into:
Because of smoke particle particle diameter and the space distribution of density and the randomness of time, in reality, be difficult to the smoke particle sample of manufacturer's standard concentration, adopt conventional scaling method accurately to determine I
sland I
olfuntcional relationship, there is great technical difficulty.In the present invention, high speed flip flop is adopted synchronously to trigger the photoelectric sensor of scattered light and transmission light measurements, compare the change of smoke particle density and flow velocity, if the response time of photoelectric sensor and difference thereof are enough short, then what can think the two measurement is same smog object.Thus, in the calibration process of device, the photoelectric sensor that device carries is measuring I from direction of principal axis
sl, the high precision photoelectric sensor utilizing device outside to demarcate axially is measuring I
ol, obtain the I that a certain concentration smog is corresponding
sland I
ol.Repeat above-mentioned steps, obtain the I that variable concentrations smog is corresponding
sland I
ol.On this basis, remove significant singular value, piecewise fitting I
slwith I
olfunction curve, thus determine f
-1.
Based on above-mentioned thought, the invention provides a kind of smoke detector calibrating installation based on laser defusing measure principle, comprise calibrating instrument and marking apparatus, described calibrating instrument comprises calibrating instrument treatment circuit, is provided with measurement chamber 14 and first photoelectric sensor 13 of the first transparent window 20 and the second transparent window 21, and described marking apparatus comprises the second photoelectric sensor 17 and trigger 18; Measuring beam 23 is incident by the first transparent window, by the second transparent window outgoing after tested smog; Described first photoelectric sensor 13 is for detecting the light intensity of the scattered beam formed through tested smog scattering; Described second photoelectric sensor 17 is for detecting the light intensity of the transmitted light beam formed through tested smog; Described trigger synchronously triggers the first photoelectric sensor and the second photoelectric sensor.
Fig. 4 is backward type scatterometry and demarcates light path schematic diagram, and wherein calibrating instrument and marking apparatus adopt split type setting.
Described first transparent window 20 and the second transparent window 21 are arranged at along the axis measuring chamber 14 both sides measuring chamber respectively; Described scattered beam is from the first transparent window outgoing, and described transmitted light beam is from the second transparent window outgoing.
Described calibrating instrument also comprises the extender lens 9, spatial filter 10 and the collimation lens 11 that set gradually; Described marking apparatus also comprises convergent lens 16, described collimation lens and convergent lens are arranged on the both sides measuring chamber, the emergent light of collimation lens enters into measures chamber, the scattered beam formed through smog 19 scattering enters into the first photoelectric sensor 13, the transmitted light formed through smog transmission enters into convergent lens, and the emergent light of convergent lens enters into the second photoelectric sensor 17.
Fig. 5 is forward-type scatterometry and demarcates light path schematic diagram, and wherein calibrating instrument and marking apparatus adopt integral type to arrange.
The ring light electric transducer that described first photoelectric sensor and the second photoelectric sensor are integrated, described ring light electric transducer has inner ring surveyed area 171 and outer shroud surveyed area 172, the light intensity of scattered beam is detected by outer shroud surveyed area, and the light intensity of transmitted light is detected by inner ring surveyed area.
Described calibrating instrument also comprises the extender lens 9, spatial filter 10 and the collimation lens 11 that set gradually; Described marking apparatus also comprises convergent lens 16, described collimation lens and convergent lens are arranged on the both sides measuring chamber, the emergent light of collimation lens enters into measures chamber, the transmitted light formed through smog transmission enters into convergent lens, the convergent beam of the formation of convergent lens enters into the endocyclic area of ring light electric transducer, and the scattered beam that convergent lens edge is formed enters into the outer region of ring light electric transducer.
Described caliberating device also comprises aerosol producer, and described aerosol producer is connected by gas circuit with measurement chamber.
As shown in Figure 3, described aerosol producer comprises flue 7, and described flue is provided with smoke inlet 4 and aerosol outlet port 1, is provided with pneumatic pump 5 in described flue, and smog, under the driving of pneumatic pump, enters flue through smoke inlet and circulates.In the present embodiment, aerosol producer adopts ring-shaped flue, and its inner wall smooth, inner and outer diameter is respectively 300mm and 420mm.Electric filament disc 3 is set outside flue, for heating degreasing sliver to produce smog.Under the driving of pneumatic pump 5, smog enters ring-shaped flue through admission line and circulates, and improves homogeneity and the stability of smoke particle density spatial distribution.Be provided with twice screen pack in flue, i.e. air inlet screen 6 and exhaust screen 2, smoke particle particle diameter is limited in 8um and following by air inlet screen, and the effect of exhaust screen prevents the adverse current of smog from polluting.Described smoke inlet is arranged on air inlet screen rear end.
Described calibrating instrument comprises the measurement light source 8, extender lens 9, spatial filter 10 and the collimation lens 11 that set gradually, described marking apparatus also comprises convergent lens 16, described collimation lens and convergent lens are arranged on the both sides measuring chamber, and the emergent light of collimation lens enters into measures chamber.
In the present embodiment, measurement light source 8 adopts solid state laser, and its emergent light, after extender lens expands, intercepts the comparatively uniform beam center portion of light distribution by spatial filtering, then becomes measuring beam after being collimated by collimation lens.Measuring beam passes perpendicularly through and irradiates the tested smoke particle group flow through and measure chamber.
As to further improvement of this embodiment, described calibrating instrument also comprises and is arranged on collimation lens and the first diaphragm 12 measured between chamber and is arranged on the second diaphragm 15 measured between chamber 14 and convergent lens.Diaphragm is for preventing paraxial parasitic light to the interference of measuring.
Figure 3 shows that the treatment circuit schematic diagram of calibrating instrument.Described calibrating instrument treatment circuit comprises amplifier, A/D module, DSP, pump control module, temperature control modules, storer, touch-screen, communication interface and audible-visual annunciator
The output of scattered light electric explorer, after precision amplifier and 16 A/D conversions, input dsp processor.Wherein, power reference provides reference power supply for A/D converter, and the built-in reference power supply of its temperature drift coefficient ratio converter is much little.Dsp processor is the core for the treatment of circuit, bearing of task be control aerosol producer and calibrating instrument inside pneumatic pump, regulate laser. operating temperature, sound and light alarm signal to export, and communication and data calculating etc.By built-in calibrating procedure, dsp processor output pulse signal, the synchronizer trigger that interlock is outside, is stored to data-carrier store and uploads in good time by the raw data of demarcation.Man-machine interaction is realized, various data such as display verification result, state etc. by LCD touch screen.If desired by communication interface with RS485 or ICP/IP protocol by data upload, or receive host computer instruction and data.
When applying calibrating installation, what the luminous power of measurement light source adopted is that laser instrument exports nominal value, temperature control measures need be taked to ensure the stability of measuring beam luminous power, reduce temperature drift.Therefore, calibrating installation comprises the thermostat of semiconductor cooler and heater strip formation, is controlled, the working temperature of laser instrument is remained within the scope of 25 ± 2 DEG C by the DSP of calibrating instrument by temperature control algorithm.Theoretical by Mie, the particle of same particle diameter is more remarkable to the scattering of short wavelength, and the wavelength of measuring beam answers appropriateness to shorten.In this example, the centre wavelength 405nm of the ripple that laser instrument sends, live width 30nm, emergent power 2mW.
In this example, scattered light power measured by the first photoelectric sensor, and sensitivity is higher, dark current is less, and peak response wavelength is near measuring beam wavelength, and the setting angle of central axis and optical axis is 30 °.For ensureing the scattered light being sampled as same smoke particle group, relative to mist flow rate and measuring beam diameter, the output response time of the first photoelectric sensor device should be as far as possible little, and the photoelectric sensor response time of calibrating instrument type selecting is 15us.
For reduction smoke particle Spatial Density Distribution homogeneity and flow velocity are on the impact of measuring, measuring beam diameter and the smog thickness passed thereof want appropriateness.Through overtesting, getting measuring beam diameter is 2mm, and the smog thickness axially irradiated is 20mm.The synchronous error of the first photoelectric sensor and the second photoelectric sensor is as far as possible little, and when demarcating calibrating instrument, the time error of external electrical microsyn output two-way pulse is no more than 10ns.
According to above-mentioned calibrating installation, the present embodiment also provides a kind of smoke detector scaling method based on laser defusing measure principle, specifically comprises the following steps:
1) according to shown in Fig. 4, the first photoelectric sensor of alignment detector and the second photoelectric sensor on optical table; Trigger is connected to the first photoelectric sensor and the second photoelectric sensor; Utilize and gather tracheae connection aerosol producer and measure chamber.
2) calibrating instrument is measured chamber and is kept clean state, start trigger output pulse signal, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores.
3) aerosol producer heating degreasing sliver produces smog, after smog is relatively stable, pass into detector.Start trigger exports pulse, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores.
4) regulate aerosol producer, change smokescope, randomness start trigger exports pulse in the process, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores.
In this real cigarette example, change smokescope refer to strengthen smokescope gradually or reduce smog low concentration or reinforcement gradually, reduction hockets.
5) repeat step 4 many times, be generally 2 ~ 5 times, certainly need also can test more times according to test.
6) remove significant singular value in test data, simulate the curve of scattering and transmitted optical power, horizontal ordinate is scattered light power, and ordinate is transmitted optical power.Determine the maximum deviation value of test data and matched curve.
7) curve coefficients is write the program storage of detector.
8) after having demarcated, withdraw outside calibration facility, in demarcation transmission light measurements position, light absorbent seals, and reduces transmitted light reflection to the interference of measuring.Must demarcate one by one before calibrating instrument dispatches from the factory, determine often to overlap the exclusive calibration curve of calibrating instrument.
The present invention utilizes electronic synchronizer device high-speed synchronous to trigger the first photodetector and outside the second photodetector demarcated, realize the synchronous acquisition to smog scattered light power and transmitted optical power, set up scattered light and transmitted light changes accurate funtcional relationship, overcoming in reality cannot the difficult problem of manufacturer's standard smog sample.During application smog calibrating instrument, according to the function established in advance, the transmitted optical power of smog by the scattered light power counter-calculation of surveying, thus obtain shading rate or the concentration of tested smog.The method has without the need to the advantage such as standard smog sample, timing signal smokescope be any, is applicable to the calibrating of scatter-type smoke transducer or staking-out work of dispatching from the factory.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. based on the smoke detector calibrating installation of laser defusing measure principle, it is characterized in that: comprise calibrating instrument and marking apparatus, described calibrating instrument comprises calibrating instrument treatment circuit, is provided with the measurement chamber (14) of the first transparent window (20) and the second transparent window (21) and the first photoelectric sensor (13), and described marking apparatus comprises the second photoelectric sensor (17) and trigger (18); Measuring beam (23) is incident by the first transparent window, by the second transparent window outgoing after tested smog; Described first photoelectric sensor (13) is for detecting the light intensity of the scattered beam formed through tested smog scattering; Described second photoelectric sensor (17) is for detecting the light intensity of the transmitted light beam formed through tested smog; Described trigger synchronously triggers the first photoelectric sensor and the second photoelectric sensor.
2. the smoke detection calibrating installation based on laser defusing measure principle according to claim 1, is characterized in that: described first transparent window (20) is arranged at along the axis measuring chamber (14) both sides measuring chamber with the second transparent window (21) respectively; Described scattered beam is from the first transparent window outgoing, and described transmitted light beam is from the second transparent window outgoing.
3. the smoke detector calibrating installation based on laser defusing measure principle according to claim 1, it is characterized in that: the ring light electric transducer that described first photoelectric sensor and the second photoelectric sensor are integrated, described ring light electric transducer has inner ring surveyed area (171) and outer shroud surveyed area (172), the light intensity of scattered beam is detected by outer shroud surveyed area, and the light intensity of transmitted light is detected by inner ring surveyed area.
4. the smoke detector calibrating installation based on laser defusing measure principle according to claim 1, is characterized in that: described calibrating installation also comprises aerosol producer, and described aerosol producer is connected with measurement chamber; Described aerosol producer comprises flue (7), described flue is provided with smoke inlet (4) and aerosol outlet port (1), pneumatic pump (5) is provided with in described flue, smog, under the driving of pneumatic pump, enters flue through smoke inlet and circulates.
5. the smoke detector calibrating installation based on laser defusing measure principle according to claim 4, is characterized in that: described aerosol producer also comprises and is arranged on air inlet screen (6) in flue and exhaust screen (2).
6. the smoke detector calibrating installation based on laser defusing measure principle according to claim 2, is characterized in that: described calibrating instrument also comprises the extender lens (9), spatial filter (10) and the collimation lens (11) that set gradually; Described marking apparatus also comprises convergent lens (16), described collimation lens and convergent lens are arranged on the both sides measuring chamber, the emergent light of collimation lens enters into measures chamber, the scattered beam formed through smog (19) scattering enters into the first photoelectric sensor (13), the transmitted light formed through smog transmission enters into convergent lens, and the emergent light of convergent lens enters into the second photoelectric sensor (17).
7. the smoke detector calibrating installation based on laser defusing measure principle according to claim 3, is characterized in that: described calibrating instrument also comprises the extender lens (9), spatial filter (10) and the collimation lens (11) that set gradually; Described marking apparatus also comprises convergent lens (16), described collimation lens and convergent lens are arranged on the both sides measuring chamber, the emergent light of collimation lens enters into measures chamber, the transmitted light formed through smog transmission enters into convergent lens, the convergent beam of the formation of convergent lens enters into the endocyclic area of ring light electric transducer, and the scattered beam that convergent lens edge is formed enters into the outer region of ring light electric transducer.
8. the smoke detector calibrating installation based on laser defusing measure principle according to claim 7 or 8, is characterized in that: described calibrating instrument also comprises and is arranged on collimation lens and the first diaphragm (12) measured between chamber and is arranged on the second diaphragm (15) measured between chamber (14) and convergent lens.
9. utilize the smoke detector caliberating device based on laser defusing measure principle described in claim 1 ~ 8 any one to carry out the method for demarcating, it is characterized in that: comprise the following steps:
1) aerosol producer produces smog, passes into and measure chamber after smog is relatively stable; Trigger exports pulse, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores;
2) regulate aerosol producer, change the concentration of smog, the output pulse of trigger randomness in the process, trigger the first photoelectric sensor and the second photoelectric sensor image data and store;
3) step 2 is repeated) repeatedly;
4) remove significant singular value in test data, then simulate the curve of scattering and transmitted optical power, horizontal ordinate is scattered light power, and ordinate is transmitted optical power, determines the maximum deviation value of test data and matched curve;
5) curve coefficients is write in the program storage of smoke detector.
10. the smoke detector scaling method based on laser defusing measure principle according to claim 9, is characterized in that: in step 1) frontly also comprise steps A:
Described steps A is specially: keep measuring the clean state in chamber, start trigger output pulse signal, triggers the first photoelectric sensor and the second photoelectric sensor image data and stores.
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