CN110132808A - A kind of thorax mouth smoke density detection method - Google Patents
A kind of thorax mouth smoke density detection method Download PDFInfo
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- CN110132808A CN110132808A CN201910274997.2A CN201910274997A CN110132808A CN 110132808 A CN110132808 A CN 110132808A CN 201910274997 A CN201910274997 A CN 201910274997A CN 110132808 A CN110132808 A CN 110132808A
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- 239000000779 smoke Substances 0.000 title claims abstract description 137
- 210000000038 chest Anatomy 0.000 title claims abstract description 59
- 238000001514 detection method Methods 0.000 title claims abstract description 45
- 238000005286 illumination Methods 0.000 claims abstract description 106
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000010304 firing Methods 0.000 claims abstract description 34
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000002834 transmittance Methods 0.000 claims description 29
- 230000003287 optical effect Effects 0.000 claims description 22
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000005622 photoelectricity Effects 0.000 claims description 6
- 235000019504 cigarettes Nutrition 0.000 abstract description 44
- 238000005259 measurement Methods 0.000 abstract description 31
- 238000002485 combustion reaction Methods 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 6
- 239000003517 fume Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 230000008033 biological extinction Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000009527 percussion Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000000391 smoking effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
-
- G01N15/075—
Abstract
The embodiment of the present invention provides a kind of thorax mouth smoke density detection method, comprising: after obtaining small arms firing, after laser transmits smoke box, is radiated at the first intensity of illumination characterize data of lens surface；After the smoke box carries out smoke evacuation processing, after obtaining laser transmission smoke box, it is radiated at the second intensity of illumination characterize data of lens surface；According to the first intensity of illumination characterize data and the second intensity of illumination characterize data, the thorax mouth smoke density of the firearms is obtained, wherein the light source of the laser is arranged in parallel in the both ends of the smoke box with the lens.Method provided in an embodiment of the present invention, the detection of thorax mouth cigarette is carried out as empty van environment using the smokeless environment after smoke evacuation, it can guarantee that photronic effective photosensitive area is equal in measurement process twice for front and back, to eliminate shooting vibration and influence of the settleability residue to measurement result precision, detection efficiency and detection accuracy are improved.
Description
Technical field
The present embodiments relate to transient state physical quantity testing field more particularly to a kind of thorax mouth smoke density detection methods.
Background technique
Small arms firing process is the process that propellant powder and powder charge generate that high temperature and pressure pushes Projectile Motion by combustion reaction.
Since launch time is extremely short in firearms emission process, the imperfect combustion or powder of thorax inner part chemical reaction do not burn
It is complete, to form combustion residue.According to there are position, being divided into the outer residue of residue and thorax in thorax；According to form, residue can divide in thorax
Thorax residue is stayed for adhesion combustion residue and fire retardant or noninflammability, the outer residue of thorax is divided into floatability combustion residue and settleability burning
Residue.Floatability combustion residue is blown out thorax mouth in shooting course and forms floatability smog, settleability in certain distance
Combustion residue is carried over barrel with thorax implication stream, and particle size is larger.The smog that thorax mouth generates during firearms percussion floats
Buoyancy combustion residue, the serious aiming for interfering shooter, influences fire accuracy.Thorax mouth smoking set has that form is unstable, there are the time is short
With it is affected by environment big the features such as, therefore Smoke Detection is the major issue that automatic weapon research field faces.At present to smog
The research method of detection is more, such as video analysis method, image detection and smoke box detection method.Thorax mouth cigarette is more than common smoke disperse
Fastly, while also aerosol spraying phenomenon can be generated, therefore carries out Smoke Detection frequently with smoke box experimental method.
Smoke box experimental method mostly uses double light path light transmittance ratio method to characterize thorax mouth cigarette size.Traditional smoke box method Smoke Detection mistake
Cheng Zhong, preshot as smokeless environment carry out DATA REASONING, after shooting in smoke box smog diffusion stablize after as have cigarette environment into
Row DATA REASONING.The phenomenon that in smoke box diffusion process layering can be presented in thorax mouth cigarette, therefore most mist detecting device
The optical path of sensor-based system is in vertical direction.Since, along with settleability residue, settleability residue can spray during firearms percussion
It is mapped in optical path, influences test result, every shooting is primary, and the removing work for carrying out settleability residue is needed after the completion of detection, is influenced
Detection efficiency.Shooting course is along with strong vibration, and since muzzle is contacted with smoke box, and smog sensor-based system and cabinet exist
Rigid connection, therefore smog sensor-based system will be influenced by small arms firing process vibrations, and sensor after preshot is caused to be deposited
In certain displacement, optical path changes, and the uncertain of measurement accuracy increases.
In existing thorax mouth smoke density detection method, due to the shadow vibrated by settleability residue and shooting course
The problem of sound, there are measurement error increases, and detection efficiency is low, and measurement accuracy uncertainty increases.
Summary of the invention
The embodiment of the present invention provides a kind of thorax mouth cigarette detection method, to solve in the prior art due to residual by settleability
The influence of slag and shooting course vibration, there are measurement error increases, and detection efficiency is low, what measurement accuracy uncertainty increased
Problem.
The embodiment of the present invention provides a kind of thorax mouth cigarette detection method, comprising:
After obtaining small arms firing, after laser transmits smoke box, it is radiated at the first intensity of illumination characterize data of lens surface；
After the smoke box carries out smoke evacuation processing, after obtaining laser transmission smoke box, it is radiated at the second illumination of lens surface
Intensity characterize data；
According to the first intensity of illumination characterize data and the second intensity of illumination characterize data, the firearms are obtained
Thorax mouth smoke density；
Wherein, the light source of the laser and the lens are arranged in parallel in the both ends of the smoke box.
Wherein, after the acquisition small arms firing, in smoke box after laser transmission, it is radiated at the first intensity of illumination of lens surface
The step of characterize data, specifically includes: after obtaining small arms firing, after laser transmits smoke box, it is radiated at preset photoelectricity pool surface,
Photronic first output voltage, using first output voltage as the first intensity of illumination characterize data.
Wherein, after the acquisition laser transmission smoke box, it is radiated at the step of the second intensity of illumination characterize data of lens surface
Suddenly, it specifically includes: after smoke box carries out smoke evacuation processing, after obtaining laser transmission smoke box, being radiated at preset photoelectricity pool surface, institute
Photronic second output voltage is stated, using second output voltage as the second intensity of illumination characterize data.
Wherein, described according to the first intensity of illumination characterize data and the second intensity of illumination characterize data, it obtains
It the step of thorax mouth smoke density of the firearms, specifically includes: using the second intensity of illumination characterize data as under empty van state
Intensity of illumination characterize data, obtain according to the first intensity of illumination characterize data and the second intensity of illumination characterize data
Ratio；According to the ratio of the first intensity of illumination characterize data and the second intensity of illumination characterize data, calculates and obtain institute
State the thorax mouth smoke density of firearms.
In request, the method also includes: according to first output voltage, the second output voltage and photocell effective
Photosensitive area in optical path calculates separately according to formula V=mIf (S) and obtains the first intensity of illumination and the second intensity of illumination；Formula
In, I is intensity of illumination, and the functional relation that f (S) is photosensitive area of the photocell in effective optical path when being S, m is photoelectric conversion
Coefficient, V are photronic output voltage.
Wherein, described according to the first intensity of illumination characterize data and the second intensity of illumination characterize data, it obtains
It the step of thorax mouth smoke density of the firearms, specifically includes: according to first intensity of illumination and the second intensity of illumination meter
Calculate the light transmittance after obtaining small arms firing in smoke box；It is calculated according to the light transmittance in smoke box after the small arms firing and obtains the rifle
The thorax mouth smoke density of tool.
Wherein, it is described calculated according to first intensity of illumination obtain small arms firing after light transmittance in smoke box the step of,
It specifically includes:
Pass through formula:
Calculate the light transmittance after light transmittance and the smoke evacuation after obtaining the small arms firing in smoke box in smoke box, in formula,
TλFor light transmittance, I2For saturating first intensity of illumination, I1For the second intensity of illumination.
Wherein, after the acquisition small arms firing, after laser transmits smoke box, it is radiated at the first intensity of illumination of lens surface
In step, further includes: if judgement knows that air pressure is more than preset threshold in the smoke box, carries out reduced pressure treatment to the smoke box.
Wherein, the laser specifically uses central wavelength for the visible red laser of 650nm.
Thorax mouth cigarette detection method provided in an embodiment of the present invention is carried out using the smokeless environment after smoke evacuation as empty van environment
The detection of thorax mouth cigarette can guarantee that photronic effective photosensitive area is equal in measurement process twice for front and back, can effectively avoid
Influence of the settleability residue to sensor-based system light path, while can also be to avoid the vibration generated due to gunslinging for laser ring
The influence in border, twice there is only discharging fume to operate between measurement, smoke box vibration is negligible, to eliminate, shooting is vibrated and settleability is residual
Influence of the slag to measurement result precision, improves detection efficiency and detection accuracy.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow diagram for the thorax mouth cigarette detection method that one embodiment of the invention provides；
Fig. 2 is in the thorax mouth cigarette detection method that one embodiment of the invention provides, and settleability residue is in lens surface schematic diagram；
Fig. 3 is the structural representation of thorax mouth cigarette acquisition device in the thorax mouth cigarette detection method that further embodiment of this invention provides
Figure.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
With reference to Fig. 1, Fig. 1 is the flow diagram for the thorax mouth cigarette detection method that one embodiment of the invention provides, provided
Method includes:
S1 after obtaining small arms firing, after laser transmits smoke box, is radiated at the first intensity of illumination characterization number of lens surface
According to.
S2 after obtaining laser transmission smoke box, is radiated at the second light of lens surface after the smoke box carries out smoke evacuation processing
According to intensity characterize data.
S3 characterizes according to first intensity of illumination characterization and second intensity of illumination, obtains the thorax mouth of the firearms
Smoke density.
Wherein, the light source of the laser and the lens are arranged in parallel in the both ends of the smoke box.
Specifically, thorax mouth cigarette is the suspension combustion residue in a kind of weapons with pipes emission process, it is a kind of small substance,
Its particle size is generally between 0.01-5.00um.Smog can hinder light to propagate in space, the particle on beam path
Scattering and absorption can have attenuation to through light intensity, and smokescope is bigger, and attenuation is stronger, and the transmitance of light is got over
It is small.
Langbobier law can state are as follows: the ratio that light is absorbed by transparent medium is unrelated with the intensity of incident light；In light path
The light of upper every blanket layer Absorption of Medium same ratio value.Thorax mouth cigarette follows Beer-Lambert Law, light transmittance, extinction to the absorption of light
Degree and smoke density can respectively indicate are as follows:
In formula, TλFor light transmittance, λ is lambda1-wavelength, I0For incident intensity, I1For the light intensity after transmission, A is absorbance,
K is proportionality constant, related with the property of extinction material, lambda1-wavelength, and b is smog thickness, and C is smokescope.By formula (2)
It is found that proportionality constant K, smog thickness b are constant in a stable detection system, it can reflect that smog is dense by light transmittance
The variation tendency of degree, in the present embodiment, by detecting the light transmittance of thorax mouth cigarette, to achieve the purpose that detect thorax mouth smoke density.
In testing, after obtaining mechanical gunslinging shooting first, the intracorporal environment of case seeks intensity of illumination as there is cigarette environment
During, then mainly to obtain laser after the smoke box for being transmitted with cigarette environment, laser irradiation is obtained in preset lens surface
The first intensity of illumination characterize data, the characterize data as the intensity of illumination under environment after gunslinging.Later, smoke box is arranged
Cigarette processing carries out second as the smoke box of smokeless environment to the smoke box after the completion of smoke evacuation and tests, and obtains laser irradiation default
Lens surface the second intensity of illumination characterize data.It is compared, is obtained according to the intensity of illumination characterize data measured twice
Transmissivity difference situation in test twice, and then obtain the thorax mouth smoke density that mechanical gun generate after shooting.
In the present embodiment, using photocell as the light-sensitive element for receiving laser, photocell is when loading reversed bias voltage
Photoelectric current is linear with intensity of illumination, while photoelectric current is influenced by photosensitive area.Through photoelectric conversion module and eliminate dark
After electric current influences, photronic output voltage is obtained, the characterize data by photronic output voltage, as intensity of illumination.
Wherein, photronic output voltage is related to the surface area of lens of laser is received, and after preventing small arms firing, sinks
Drop property residue is ejected from thorax mouth, is attached to lens surface, is influenced optical path, therefore, in the present embodiment, by smog after gunslinging
Smoke box after diffusion is stablized has carried out cigarette environment measurement, and then starting fan is discharged fume carries out smokeless environment measurement again, finally
Light transmittance is sought, this process can ensure that photronic effective photosensitive area is equal in measurement process twice for front and back.
By the method, the detection of thorax mouth cigarette is carried out as empty van environment using the smokeless environment after smoke evacuation, before capable of guaranteeing
Photronic effective photosensitive area is equal in measurement process twice afterwards, and settleability residue can effectively be avoided to examine sensor-based system
Survey the influence of optical path, at the same can also the vibration generated due to gunslinging of influence to avoid to(for) laser environment, twice between measurement
There is only smoke evacuations to operate, and smoke box vibration is negligible, to eliminate shooting vibration and settleability residue to measurement result precision
It influences, improves detection efficiency and detection accuracy.
On the basis of the above embodiments, after the acquisition small arms firing, after the acquisition small arms firing, laser in smoke box
It after transmission, the step of being radiated at the first intensity of illumination characterize data of lens surface, specifically includes: after obtaining small arms firing, swashing
After light transmission smoke box, it is radiated at preset photoelectricity pool surface, photronic first output voltage, by the first output electricity
Pressure is used as the first intensity of illumination characterize data.
After acquisition laser transmission smoke box, the step of being radiated at the second intensity of illumination characterize data of lens surface, tool
Body includes: after obtaining laser transmission smoke box, to be radiated at preset photoelectricity pool surface, the light after smoke box carries out smoke evacuation processing
Second output voltage of battery, using second output voltage as the second intensity of illumination characterize data.
It is described according to the first intensity of illumination characterize data and the second intensity of illumination characterize data, obtain the rifle
It the step of thorax mouth smoke density of tool, specifically includes: using the second intensity of illumination characterize data as the illumination under empty van state
Intensity characterize data obtains the ratio according to the first intensity of illumination characterize data and the second intensity of illumination characterize data；
According to the ratio of the first intensity of illumination characterize data and the second intensity of illumination characterize data, calculates and obtain the firearms
Thorax mouth smoke density.
Specifically, passing through formula:
Calculate the light transmittance after light transmittance and the smoke evacuation after obtaining the small arms firing in smoke box in smoke box, in formula,
TλFor light transmittance, I2For the intensity of illumination after transmission, I1Intensity of illumination when for laser light incident.
On the basis of the above embodiments, the method also includes: according to first output voltage, the second output voltage
It calculates separately with photosensitive area of the photocell in effective optical path and obtains the first intensity of illumination and the according to formula V=mIf (S)
Two intensities of illumination.In formula, I is intensity of illumination, and the function that f (S) is photosensitive area of the photocell in effective optical path when being S closes
System, m are photoelectric conversion factors, and V is photronic output voltage.
It is described according to the first intensity of illumination characterize data and the second intensity of illumination characterize data, obtain the rifle
The step of thorax mouth smoke density of tool, specifically include: according to first intensity of illumination and the second intensity of illumination obtain firearms are penetrated
Hit the light transmittance in rear smoke box；According to the light transmittance in smoke box after the small arms firing, the thorax mouth cigarette for obtaining the firearms is calculated
Concentration.
The light transmission according in smoke box after first intensity of illumination and the second intensity of illumination calculating acquisition small arms firing
The step of rate, specifically includes:
Pass through formula:
Calculate the light transmittance after light transmittance and the smoke evacuation after obtaining the small arms firing in smoke box in smoke box, in formula,
TλFor light transmittance, I2For the first intensity of illumination, I1For the second intensity of illumination.
Wherein, the laser specifically uses central wavelength for the visible red laser of 650nm.
Specifically, according to formula (1), it is desirable that go out TλLight intensity I when must be according to incidence0With the light intensity I after transmission1.It is practical
Light intensity I in operation, before transmission0It is not easy to detect, it need to be according to the light intensity I after transmission1To estimate.
The laser wavelength that system uses is the visible red laser of 650nm, and in the wave band, the scattering of particle is energy attenuation
Main cause ignores absorption, then the aerial vertical light transmission rate of laser are as follows:
In formula, k1=βpIt (0), is the KPT Scatter coefficient at ground level (h=0), value 0.199km-1, k2For
The inverse of KPT Scatter absolute altitude, value 0.83km-1, k3=βmIt (0), is the molecular scattering system at ground level (h=0)
Number, value 0.0124km-1；k4For the inverse of molecular scattering absolute altitude, value 0.13km-1, h is vertical optical path distance.
In muzzle cigarette test macro, vertical optical path distance is less than 400mm, takes h=there are surplus
1000mm, the then aerial vertical light transmission rate of laser are as follows: T1=99.97%.
By (1) formula it is found that light intensity I under smokeless environment after laser transmission1With I when incidence0Light intensity it is almost unchanged, can
It has been approximately considered following relationship: I0=I1。
There is light intensity I when laser light incident under cigarette environment0, light intensity I after transmission2, then the light transmittance under cigarette environment can indicate
Are as follows:
Use photocell as the light-sensitive device for receiving laser, light of the photocell when loading reversed bias voltage in detection system
Electric current is linear with intensity of illumination, while photoelectric current is influenced by photosensitive area.Through photoelectric conversion module and eliminate dark electricity
After stream influences, output voltage V such as formula is indicated:
V=mIf (S) (5)
In formula, I is intensity of illumination, the functional relation that f (S) is photosensitive area of the photocell in effective optical path when being S, m
For photoelectric conversion factors, V is photronic output voltage.
By S0And S2It respectively indicates smokeless environment and has the photocell photosensitive area under cigarette environment, V1And V2Respectively indicate nothing
Cigarette environment and there is the output voltage under cigarette environment, when the effective photosensitive area of photocell that two kinds are tested under environment is equal, i.e. S0
=S2, it can be obtained by (4) and (5):
After small arms firing, settleability residue is ejected from thorax mouth, is attached to lens surface, influences optical path.It will be residual
Slag is considered as impermeable stimulative substance, as shown in Fig. 2, area of the lens surface in optical path section is S0, wherein forming residue drop point has n block
Tiny area, single-block area Si(i=1,2 ..., n), thus in optical path light tight region area S3It can be expressed from the next:
Therefore, after shooting in smoke box effective optical path area of section are as follows:
S'2=S0-S3 (8)
It is smokeless environment according to preshot, being used as after shooting, which has cigarette environment to carry out test, seeks light transmittance, residue attachment
The problem not waited before and after lens surface will lead to the effective photosensitive area of photocell, it is clear that S'2≠S0, then formula (6) is not met
Therefore condition using after small arms firing in the present embodiment, has carried out cigarette environment measurement after smog diffusion is stablized, has then started
Fan is discharged fume carries out smokeless environment measurement again, finally seeks light transmittance, this process can ensure that front and back twice in measurement process
Photronic effective photosensitive area is equal.
It in repeatedly continuous measurement, due to the covering of settleability residue, can be considered that the effective area of optical path reduces on an equal basis, examine
Front and back has cigarette equal with the optical path effective area of smokeless environment measurement twice during survey, according to formula (4)-(10), subsequent thorax
Detection effect is not also influenced by settleability residue in mouth cigarette detection, therefore can continuously be measured.
In conclusion thorax mouth cigarette detection method provided in an embodiment of the present invention, small arms firing process are having cigarette environment measurement
Before, and smokelessly after having cigarette environment measurement, measure is not influenced twice by shooting vibration for the measurement of environment, and survey twice
There is only smoke evacuations to operate between amount, and smoke box smoke evacuation uses small-power fan, and smoke box vibration is negligible, therefore this detection scheme
Influence of the shooting vibration to measurement result precision can be eliminated, detection accuracy is improved, while in multiple test, without to cigarette
It is cleared up in case, test can be carried out continuously, improve detection efficiency.
In another embodiment of the invention, the thorax mouth cigarette acquisition device of use is as shown in Figure 3, comprising: light source 1, lens
2, smoke box 3 and exhaust fan 4, light source 1 and lens 2 are arranged in parallel in the both ends of the smoke box, and light source and lens constitute Photoelectric Detection
Module, after obtaining small arms firing, laser transmit smoke box after, be radiated at the first intensity of illumination characterize data of lens surface with
And after the smoke box carries out after smoke evacuation processing, after obtaining laser transmission smoke box, it is radiated at the second intensity of illumination of lens surface
Characterize data；The exhaust fan 4 is set to the smoke box side, is used for after obtaining the first intensity of illumination characterize data, to cigarette
Case carries out smoke evacuation processing.
Specifically, the environment in cabinet 3 is as there is cigarette environment, after firearms are shot at by shooting mouth 6 to obtain illumination
Intensity characterize data, then mainly to obtain laser after the smoke box for being transmitted with cigarette environment, obtains during seeking light transmittance
Laser 1 is radiated at the first intensity of illumination characterize data on preset 2 surface of lens, as the intensity of illumination under environment after gunslinging.
One group of exhaust fan is installed in the diagonal position of smog collecting box simultaneously, after sensing excludes smog in case.Due to the work of gravity
With smog diffusion can generate layering after stablizing, so modulation laser and photocell are arranged in vertical direction, pass through exhaust fan 4
Smoke evacuation processing is carried out to smoke box, second is carried out as the smoke box of smokeless environment to the smoke box 3 after the completion of smoke evacuation and is tested, obtains and swashs
Light 1 is radiated at the second intensity of illumination characterize data on preset 2 surface of lens.According to the intensity of illumination characterize data measured twice
It compares, by computing module, and then obtains the thorax mouth smoke density that mechanical gun generate after shooting.
In the present embodiment, using photocell as the light-sensitive element for receiving laser, photocell is when loading reversed bias voltage
Photoelectric current is linear with intensity of illumination, while photoelectric current is influenced by photosensitive area.Through photoelectric conversion module and eliminate dark
After electric current influences, photronic output voltage is obtained, according to photronic output voltage, and then calculates laser transmitted through cigarette
Intensity of illumination after case.
Wherein, photronic output voltage is related to the surface area of lens of laser is received, and after preventing small arms firing, sinks
Drop property residue is ejected from thorax mouth, is attached to lens surface, is influenced optical path, therefore, in the present embodiment, by smog after gunslinging
Smoke box after diffusion is stablized has carried out cigarette environment measurement, and then starting fan is discharged fume carries out smokeless environment measurement again, finally
Seek thorax mouth smoke density, this process can ensure that photronic effective photosensitive area is equal in measurement process twice for front and back.
By this system, the detection of thorax mouth cigarette is carried out as empty van environment using the smokeless environment after smoke evacuation, before capable of guaranteeing
Photronic effective photosensitive area is equal in measurement process twice afterwards, and settleability residue can effectively be avoided to examine sensor-based system
Survey the influence of optical path, at the same can also the vibration generated due to gunslinging of influence to avoid to(for) laser environment, twice between measurement
There is only smoke evacuations to operate, and smoke box vibration is negligible, to eliminate shooting vibration and settleability residue to measurement result precision
It influences, improves detection efficiency and detection accuracy.
On the basis of the above embodiments, the system also includes pressure release modules, if for judging to know in the smoke box
Air pressure is more than preset threshold, then carries out reduced pressure treatment to the smoke box.
Specifically, smog is collected in smog collecting box after small arms firing.If air pressure is excessive in smog collecting box, can
It is depressurized by relief valve, guarantees detection safety.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of thorax mouth smoke density detection method characterized by comprising
After obtaining small arms firing, after laser transmits smoke box, it is radiated at the first intensity of illumination characterize data of lens surface；
After the smoke box carries out smoke evacuation processing, after obtaining laser transmission smoke box, it is radiated at the second intensity of illumination of lens surface
Characterize data；
According to the first intensity of illumination characterize data and the second intensity of illumination characterize data, the thorax mouth of the firearms is obtained
Smoke density；
Wherein, the light source of the laser and the lens are arranged in parallel in the both ends of the smoke box.
2. the method according to claim 1, wherein after the acquisition small arms firing, in smoke box after laser transmission,
The step of being radiated at the first intensity of illumination characterize data of lens surface, specifically includes:
After obtaining small arms firing, after laser transmits smoke box, it is radiated at preset photoelectricity pool surface, photronic first output
Voltage, using first output voltage as the first intensity of illumination characterize data.
3. the method according to claim 1, wherein being radiated at lens measure after acquisition laser transmission smoke box
It the step of second intensity of illumination characterize data in face, specifically includes:
After smoke box carries out smoke evacuation processing, after obtaining laser transmission smoke box, it is radiated at preset photoelectricity pool surface, the photocell
The second output voltage, using second output voltage as the second intensity of illumination characterize data.
4. method according to claim 1 to 3, which is characterized in that described to characterize number according to first intensity of illumination
According to the second intensity of illumination characterize data, the step of obtaining the thorax mouth smoke density of the firearms, specifically include:
Using the second intensity of illumination characterize data as the intensity of illumination characterize data under empty van state, obtain according to described first
The ratio of intensity of illumination characterize data and the second intensity of illumination characterize data；
According to the ratio of the first intensity of illumination characterize data and the second intensity of illumination characterize data, calculate described in obtaining
The thorax mouth smoke density of firearms.
5. the method according to claim 1, wherein the method also includes:
According to first output voltage, the photosensitive area of the second output voltage and photocell in effective optical path, according to formula V
=mIf (S) is calculated separately and is obtained the first intensity of illumination and the second intensity of illumination；
In formula, I is intensity of illumination, and the functional relation that f (S) is photosensitive area of the photocell in effective optical path when being S, m is light
Electric conversion coefficient, V are photronic output voltage.
6. according to the method described in claim 5, it is characterized in that, described according to the first intensity of illumination characterize data and institute
The step of stating the second intensity of illumination characterize data, obtaining the thorax mouth smoke density of the firearms, specifically includes:
The light transmittance after obtaining small arms firing in smoke box is calculated according to first intensity of illumination and second intensity of illumination；
According to the light transmittance in smoke box after the small arms firing, the thorax mouth smoke density for obtaining the firearms is calculated.
7. according to the method described in claim 6, it is characterized in that, second illumination according to first intensity of illumination
Strength co-mputation obtains the step of light transmittance after small arms firing in smoke box, specifically includes:
Pass through formula:
Calculate the light transmittance after obtaining the small arms firing in smoke box, in formula, TλFor light transmittance, I2For the first intensity of illumination, I1For
Second intensity of illumination.
8. the method according to claim 1, wherein after laser transmits smoke box, being shone after the acquisition small arms firing
It penetrates in the first intensity of illumination of lens surface the step of, further includes:
If judgement knows that air pressure is more than preset threshold in the smoke box, carries out reduced pressure treatment to the smoke box.
9. the method according to claim 1, wherein the laser specifically use central wavelength for 650nm can
Show laser.
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