CN110501305A - A kind of detection device and method of vehicle exhaust - Google Patents
A kind of detection device and method of vehicle exhaust Download PDFInfo
- Publication number
- CN110501305A CN110501305A CN201910846217.7A CN201910846217A CN110501305A CN 110501305 A CN110501305 A CN 110501305A CN 201910846217 A CN201910846217 A CN 201910846217A CN 110501305 A CN110501305 A CN 110501305A
- Authority
- CN
- China
- Prior art keywords
- absorption signal
- signal
- absorption
- vehicle exhaust
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 130
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010521 absorption reaction Methods 0.000 claims abstract description 190
- 238000012545 processing Methods 0.000 claims abstract description 30
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 claims description 72
- 239000001294 propane Substances 0.000 claims description 35
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000035945 sensitivity Effects 0.000 abstract description 14
- 239000007789 gas Substances 0.000 description 80
- 238000010586 diagram Methods 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 230000000505 pernicious effect Effects 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 238000004590 computer program Methods 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- 238000004422 calculation algorithm Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229960004424 carbon dioxide Drugs 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000295 fuel oil Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 238000000825 ultraviolet detection Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 210000004709 eyebrow Anatomy 0.000 description 1
- 210000000720 eyelash Anatomy 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/359—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using near infrared light
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
-
- 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
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N2021/3129—Determining multicomponents by multiwavelength light
- G01N2021/3133—Determining multicomponents by multiwavelength light with selection of wavelengths before the sample
Abstract
The application belongs to detection technique field, in particular to the detection device and method of a kind of vehicle exhaust.Wherein, a kind of detection device of vehicle exhaust, comprising: laser, for emitting the detection light beam of tail gas；Detector, for obtaining the first absorption signal of the tail gas；Lock-in amplifier when for detecting that first absorption signal does not meet preset condition, carrying out locking phase enhanced processing to first absorption signal, obtaining the second absorption signal；First converter, for second absorption signal to be converted into digital signal.When the embodiment of the present application detects that the first absorption signal does not meet preset condition, locking phase enhanced processing is carried out to the first absorption signal, obtains the second absorption signal, the sensitivity of gas concentration detection can be improved in the available gas concentration into vehicle exhaust.
Description
Technical field
The application belongs to detection technique field, in particular to the detection device and method of a kind of vehicle exhaust.
Background technique
The exhaust gas that vehicle exhaust, i.e. automobile are discharged from exhaust pipe.Vehicle exhaust is a big factors of air pollution, automobile
Dysgenic some other solid particle is generated containing carbon monoxide, nitrogen oxides and to human body in tail gas, is especially contained
Lead gasoline is bigger to the harm of human body.In Chinese large- and-medium size cities, motor vehicle exhaust emission has become the main source of atmospheric pollution.
China with vehicle amount with the increase of economic rapid development and society need, will increase substantially.It can be seen that detection automobile
Exhaust emission is extremely urgent.
Summary of the invention
The embodiment of the present application provides the detection device and method of a kind of vehicle exhaust, and the spirit of gas concentration detection can be improved
Sensitivity.
In a first aspect, the embodiment of the present application provides a kind of detection device of vehicle exhaust, comprising:
Laser, for emitting the detection light beam of tail gas；
Detector, for obtaining the first absorption signal of the tail gas；
Lock-in amplifier when for detecting that first absorption signal does not meet preset condition, is absorbed to described first
Signal carries out locking phase enhanced processing, obtains the second absorption signal；
First converter, for second absorption signal to be converted into digital signal.
According to some embodiments, described device further include:
Frequency multiplier, for exporting frequency-doubled signal to the lock-in amplifier.
According to some embodiments, described device further include:
The concentration of propane in the tail gas is calculated for being based on second absorption signal in concentration calculation module.
According to some embodiments, described device further include:
Second converter for being converted into digital signal to first absorption signal, and is sent to the densimeter
Calculate module.
Second aspect, the embodiment of the present application provide a kind of detection method of vehicle exhaust, comprising:
Transmitting is for the detection light beam across tail gas；
Obtain the first absorption signal of the tail gas；
When detecting that first absorption signal does not meet preset condition, the second absorption signal is obtained, described second absorbs
Signal is the absorption signal carried out after locking phase enhanced processing to first absorption signal；
Based on second absorption signal, the concentration of propane in the tail gas is calculated.
Described to be based on first absorption signal according to some embodiments, the concentration for calculating propane in the tail gas includes:
When detecting that first absorption signal meets preset condition, it is based on first absorption signal, calculates the tail
The concentration of propane in gas.
It is described that first absorption signal is amplified according to some embodiments, after getting the second absorption signal
Further include:
Processing is amplified to first absorption signal.
It is described when detecting that first absorption signal does not meet preset condition according to some embodiments, it obtains second and inhales
The collection of letters number, second absorption signal are that the absorption signal after carrying out locking phase enhanced processing to first absorption signal wraps before
It includes:
Receive frequency-doubled signal.
According to some embodiments, when detecting that first absorption signal does not meet preset condition, obtains second and absorb letter
Number, second absorption signal is that the absorption signal after carrying out locking phase enhanced processing to first absorption signal includes:
It detects that first absorption signal is lower than 3 times of noise signal, obtains second absorption signal.
It is described to be based on second absorption signal according to some embodiments, it calculates in the tail gas before the concentration of propane
Include:
Second absorption signal is AD converted.
The third aspect, the embodiment of the present application provide a kind of detection device of vehicle exhaust, including memory, processor and
The computer program that can be run in the memory and on the processor is stored, the processor executes the computer
Method described in any one of above-described embodiment is realized when program.
Fourth aspect, the embodiment of the present application provide a kind of computer readable storage medium, are stored thereon with computer program,
The program realizes method described in any one of above-described embodiment when being executed by processor.
The embodiment of the present application provides a kind of detection device of vehicle exhaust, comprising: laser, for emitting the detection of tail gas
Light beam；Detector, for obtaining the first absorption signal of the tail gas；Lock-in amplifier, for detecting that described first absorbs
When signal does not meet preset condition, locking phase enhanced processing is carried out to first absorption signal, obtains the second absorption signal；First
Converter, for second absorption signal to be converted into digital signal.The embodiment of the present application is by detecting the first absorption
When signal does not meet preset condition, locking phase enhanced processing is carried out to the first absorption signal, obtains the second absorption signal, it is available
The sensitivity of gas concentration detection can be improved in gas concentration into vehicle exhaust.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, 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 only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 shows the structural schematic diagram of the detection device of the vehicle exhaust of the embodiment of the present application；
Fig. 2 a shows the laser of the embodiment of the present application without the curve of output schematic diagram before low-frequency current modulation；
Fig. 2 b shows the laser of the embodiment of the present application through the modulated curve of output schematic diagram of low-frequency current；
Fig. 3 shows the schematic diagram of the absorption band of the gas of the embodiment of the present application；
Fig. 4 shows the schematic diagram of the Absorption Line of the gas of another embodiment of the application；
Fig. 5 shows the structural schematic diagram of the detection device of the vehicle exhaust of another embodiment of the application；
Fig. 6 shows the structural schematic diagram of the detection device of the vehicle exhaust of another embodiment of the application；
The detection light beam that Fig. 7 shows the transmitting of the embodiment of the present application laser reaches the light path schematic diagram of detection；
Fig. 8 shows the flow diagram of the detection method of the embodiment of the present application vehicle exhaust.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall in the protection scope of this application.
Motor vehicle emission refers to CO (carbon monoxide), the HC+NO being discharged from exhaust gasx(hydrocarbon and nitrogen oxides),
The pernicious gases such as PM (particle, soot).Pernicious gas is the pernicious gas that the engine of automobile generates during work by combustion.
These pernicious gas Producing reasons are different, and CO is that fuel oil aoxidizes incomplete intermediate product, can generate when oxygen is inadequate
CO, mixture strength is big and gaseous mixture unevenly can all be such that the CO in exhaust increases.HC is unburned substance in fuel, due to
The reasons such as gaseous mixture is uneven, chamber wall is cold cause part fuel oil have not enough time to burning be just discharged away.NOxIt is fuel
A kind of substance that (gasoline) generates in combustion.A kind of substance that anoxic generates when PM is also fuel burning.Due to automobile
The pernicious gas of discharge can cause very big threat to the health of people, therefore detect motor vehicle exhaust emission object and compel in eyebrow
Eyelash.
It can be readily appreciated that user can detecte the ingredient of vehicle exhaust, the discharge of various substances in vehicle exhaust is determined
Whether amount meets national standard.The ingredient of vehicle exhaust remote sensing instrument detection vehicle exhaust can be used in user.Vehicle exhaust telemetering
The gas component that instrument can detecte has CO, CO2, HC, NO and smoke opacity.The working method of remote vehicle emissions instrument has two
Kind.The first working method is remote vehicle emissions instrument using near-infrared laser detection CO, CO2, using ultraviolet detection NO and HC
(1,3 butadiene).Second of working method is remote vehicle emissions instrument using non-dispersion infrared light detection CO, CO2、HC(C3H8),
Ultraviolet detection NO.But the standard substance of remote vehicle emissions instrument HC in HC context of detection Shortcomings, national examination criteria
It is C3H8, C is required in motor vehicle environmental protection annual test3H8Discharge value is less than 100ppm.In the first working method, vehicle exhaust
1,3 butadiene in remote sensing instrument detection HC do not meet the designated substance of HC in national examination criteria, in second of working method, vapour
Tail gas remote sensing instrument can use C of the non-dispersion infrared light detection into HC3H8, but sensitivity not enough (general Testing index ±
250ppm).The HC emissions data that above two working method detects is unable to and detects field data and carries out reinspection pair
Than being only capable of as reference index.
Optionally, automobile emissions standards refer to CO (carbon monoxide), the HC+NO being discharged from automobile exhaust gasx(nytron
Object and nitrogen oxides), the regulation of the pernicious gases content such as PM (particle, soot).As the requirement of Environmental improves, automobile
Levels of emissions be also continuously improved.The raising of discharge standard means the reduction of Exhaust emission concentration, therefore existing distant
The detection sensitivity of measurement equipment is not just able to satisfy the discharge Testing index of new car more.Therefore, the detection spirit of vehicle exhaust is improved
Sensitivity is imperative.
According to some embodiments, the method that user improves the sensitivity of gas detection gas concentration detection can be in car tail
The White pond optical path repeatedly absorbed is provided in gas remote sensing instrument, however the test object of vehicle exhaust remote sensing instrument is in road uplink
The exhaust gas of middle motor vehicle emission is sailed, automobile driving speed is fast, and the exhaust gas of discharge can be diffused into environment quickly, therefore more using optical path
The secondary round-trip method for improving absorption sensitivity is infeasible.
The embodiment of the present application provides a kind of detection device of vehicle exhaust, by detecting that it is pre- that the first absorption signal is not met
If when condition, carrying out locking phase enhanced processing to the first absorption signal, the second absorption signal is obtained, it is available into vehicle exhaust
Gas concentration, the convenience administered to exhaust emissions automobile can be improved, and then atmospheric environment can be improved.
Fig. 1 shows the structural schematic diagram of the detection device of the vehicle exhaust of the embodiment of the present application.
As shown in Figure 1, the detection device 10 of the vehicle exhaust includes: laser 11, detector 12,13 and of lock-in amplifier
First converter 14.
According to some embodiments, laser 11 is a kind of device that can emit detection light beam.When the detection of vehicle exhaust fills
When setting ingredients different in 10 detection vehicle exhausts, laser can receive different input signals.According to the input received
Signal, laser 11 can emit the light beam of the specific wavelength of detection vehicle exhaust.The received input signal of laser 11 is different
When, the wavelength of the detection light beam of transmitting is also different.Such as laser 11 can emit detection propane gas central wavelength be
The light beam of 3578nm.When the light beam passes through vehicle exhaust to be detected, vehicle exhaust to be detected can absorb the energy of fraction of laser light.
It can be readily appreciated that due to different wave length signal attenuation degree of the detection light beam Jing Guo different gas componants not
Together, when therefore detection device 10 detects the gas with various ingredient in vehicle exhaust, laser 11 can emit the inspection of different wave length
Survey light beam.Laser 11 can receive low-frequency current modulation.Laser 11, can be with low-frequency sweep spy after low-frequency current is modulated
Levy absorption line.Fig. 2 a shows laser 11 without the curve of output before low-frequency current modulation, and Fig. 2 b shows laser 11 through low
Curve of output before and after frequency current-modulation.Laser 11 can be modulated by amplitude simultaneously in frequency modulation(PFM).
Optionally, when detection device 10 detects different gas componants, laser 11 can the letter of acceptance latitude modulation simultaneously
Number and frequency modulated signal, so as to emit the detection light beam of different wave length.Such as laser 11 can simultaneously modulated signal
Amplitude and frequency modulating signal.Such as when detecting the carbon dioxide in vehicle exhaust, laser 11 is according to the amplitude tune received
Signal processed and frequency modulated signal can be different with launch wavelength infrared ray.Such as detection device 10 detects one in vehicle exhaust
When carbonoxide, laser 11 can be about with launch wavelength range according to the am signals and frequency modulated signal received
4.68 μm of infrared ray, and the detection only carries out under conditions of constant temperature.Such as detection device 10 detects in vehicle exhaust
When nitric oxide, laser 11 can be about with launch wavelength range according to the am signals and frequency modulated signal received
5.25um infrared ray.
Optionally, when the detection light beam that laser 11 emits passes through vehicle exhaust, the signal for detecting light beam, which can generate, to decline
Subtract.Based on the deamplification of detection light beam, the first absorption signal of the available propane into vehicle exhaust of detector 12.Detection
Device 12 is the device of observation and record particle, can be used for obtaining the first absorption signal of a certain gas componant of vehicle exhaust.Inspection
The deamplification for surveying light beam is spectral signal, which can be converted to electric signal, therefore detector 12 by detector 12
The first absorption signal got is electric signal.Detector 12 for example will acquire the deamplification conversion of propane in vehicle exhaust
For the first absorption signal, which is sent to lock-in amplifier.
It can be readily appreciated that detection device 10 can receive the absorption band of vehicle exhaust.The absorption band of vehicle exhaust is
It is made of a plurality of Absorption Line, a plurality of Absorption Line can be as shown in Figure 3.Detection device 10 can be former based on non-dispersive absorption spectrum
Reason obtains the absorption band of vehicle exhaust, and non-dispersive absorption spectrum principle is that the optical filter similar in a piece of bandwidth and absorption band is realized
, its advantages are that structure is simple, the disadvantage is that sensitivity is low and to absorb non-linear phenomena serious, when there is other interference in absorption band
When cannot be distinguished.The technical solution of the embodiment of the present application is detection device using one in narrow linewidth laser scanning absorption band
Absorption Line can avoid the influence of other gases.Such as narrow linewidth laser can be with the place in a plurality of Absorption Line shown in scanning figure 4
Absorption Line in middle position.Absorption sensitivity can be improved in an Absorption Line in narrow linewidth laser scanning absorption band, into
And the sensitivity of automobile emission gas analyzer can be improved.
According to some embodiments, the component part of lock-in amplifier 13 can have oscillator, frequency mixer and low-pass filter.
Lock-in amplifier 13 can detecte whether the first absorption signal meets preset condition.When lock-in amplifier 13 detects the first absorption
When signal does not meet preset condition, locking phase enhanced processing is carried out to the first absorption signal, obtains the second absorption signal.Wherein, it locks
Phase amplifier, which carries out locking phase enhanced processing to the first absorption signal, can be lock-in amplifier to the secondary humorous of the first absorption signal
Wave carries out Phase synchronization processing, and it is same to can also be that the first absorption signal is first carried out phase by first harmonic by lock-in amplifier
Step carries out second-harmonic detection according to the locking phase of acquisition later.Since lock-in amplifier 13 is detecting the first absorption signal
When, lock-in amplifier 13 itself can have noise signal, and in order to reduce influence of the noise signal to concentration calculation result, locking phase is put
The intensity that the preset condition that big device 13 is arranged for example can be the first absorption signal is more than 3 times of noise signal strength.Work as locking phase
When amplifier 13 detects that the first absorption signal is 2 times of noise signal, detect that first absorption signal is less than noise letter
Number 3 times, to first absorption signal carry out locking phase amplification, the second absorption signal is got, so as to reduce noise signal
Influence to testing result.
Optionally, the preset condition that lock-in amplifier 13 is arranged for example can be the first absorption signal more than noise signal
5 times.Lock-in amplifier 13 can measure the phase and width of the first absorption signal of a certain frequency from the signal flooded by noise
Value.When lock-in amplifier 13 detecting the first absorption signal 2 times of noise signal, lock-in amplifier 13 is absorbed to first to be believed
It number amplifies with after bandpass filtering treatment, obtains the first absorption signal and reference signal with the common input mixer of reference signal
Processing result, then the second absorption signal will be got after the processing result low-pass filtered device filtering.Wherein reference signal can
With the signal after to be frequency multiplier by input signal carry out process of frequency multiplication.The reference signal for example can be frequency multiplier for input signal
Signal after carrying out 2 process of frequency multiplication.The output signal frequency of frequency mixer be equal to the sum of the first absorption signal and reference signal frequency,
Difference or the circuit that other are combined for the two.Frequency mixer can be made of non-linear element and frequency-selective circuit.Detection device 10 uses
Lock-in amplifier 13 handle to the first absorption signal available to high-precision absorption signal, and vehicle exhaust can be improved
Detection device detection accuracy.
It can be readily appreciated that the first converter 14 is analog-digital converter, it can refer to that analog-signal transitions are by one
The electronic component of digital signal.Include the first converter 14 in the detection device of vehicle exhaust, believes for being absorbed second
Number it is converted into digital signal.Such as the first absorption signal of the propane that lock-in amplifier 13 obtains can be converted into digital letter
Number.The type of first converter 14 include but is not limited to integral form, successive approximation, compare parallel type/serial parallel type,
∑-Δ modulation type, capacitor array gradually compare type, voltage to frequency conversion type.
Optionally, as shown in figure 5, the detection device 10 of the vehicle exhaust further includes concentration calculation module 15, the densimeter
The second absorption signal can be based on by calculating module 15, and the concentration of propane in tail gas is calculated.Wherein the concentration calculation module 15 can
To be computer.The signal of the concentration calculation module 15 processing is digital signal, and the obtained after lock-in amplifier is handled
Two absorption signals are analog signal, and the first converter 14 can be converted into digital signal with the second absorption signal, and by the number
Signal is sent to concentration calculation module.
Optionally, the detection device 10 of the vehicle exhaust can be not only used for the concentration of propane in detection tail gas, can be with
Calculate the concentration of other gas componants in tail gas.For example, the detection device 10 of the vehicle exhaust can be also used for calculating in tail gas
The concentration of carbon dioxide.
The embodiment of the present application provides a kind of detection device of vehicle exhaust, comprising: laser, for emitting the detection of tail gas
Light beam；Detector, for obtaining the first absorption signal of the tail gas；Lock-in amplifier, for detecting that described first absorbs
When signal does not meet preset condition, locking phase enhanced processing is carried out to first absorption signal, obtains the second absorption signal；First
Converter, for second absorption signal to be converted into digital signal.The embodiment of the present application is by detecting the first absorption
When signal does not meet preset condition, locking phase enhanced processing is carried out to the first absorption signal, obtains the second absorption signal, it is available
The sensitivity of gas concentration detection can be improved in gas concentration into vehicle exhaust.
Fig. 6 shows the structural schematic diagram of the detection device of the vehicle exhaust of another embodiment of the application.
As shown in fig. 6, the detection device 20 of the vehicle exhaust includes: laser 11, detector 12,21 and of signal amplifier
Second converter 22.
According to some embodiments, laser 11 can emit the detection light of a certain gas composition concentration in detection vehicle exhaust
Beam.When detection device 20 detects the concentration of propane in vehicle exhaust, the detection light beam that laser 11 emits can pass through automobile
Tail gas, the signal for detecting light beam can generate decaying.Based on the deamplification of detection light beam, detector 12 is available to arrive car tail
First absorption signal of a certain gas componant in gas.Signal amplifier 21 can amplify the first absorption signal, when detection the
When one absorption signal meets preset condition, the first absorption signal is converted into digital signal by the second converter 22, and is sent to
Concentration calculation module 15.Concentration calculation module 15 based on the received digital signal can calculate in vehicle exhaust a certain gas at
The concentration divided.
According to some embodiments, laser 11 can emit the detection light beam of propane concentration in detection vehicle exhaust.When sharp
When the detection light beam that light device 11 emits passes through vehicle exhaust, due to the presence of the propane in vehicle exhaust, the signal of light beam is detected
Decaying can be generated.Based on the deamplification of detection light beam, the first of the available propane into vehicle exhaust of detector 12 absorbs
Signal.Signal amplifier 21 can amplify the first absorption signal, when detecting that it is pre- that amplified first absorption signal meets
If when condition, amplified first absorption signal is converted into digital signal by the second converter 22, and is sent to concentration calculation
Module 15.Digital signal can calculate the concentration of propane in vehicle exhaust to concentration calculation module 15 based on the received.
It can be readily appreciated that the optical path that the detection light beam that laser 11 emits reaches detection can be as shown in Figure 7.Laser
11 transmitting detection light beams, detection light beam pass through the corner reflection that car tail air mass 62 is mapped to opposite at collimated light beam by collimating mirror 61
On device 63.Corner reflector 63 reflects this Shu Guang, converges on detector 12 by condenser 64, and detector 12 can incite somebody to action
First absorption signal is sent to signal amplifier 21.
The embodiment of the present application provides a kind of detection device of vehicle exhaust, comprising: laser can emit detection car tail
The detection light beam of a certain gas composition concentration in gas.When the detection light beam of laser transmitting passes through vehicle exhaust, vehicle exhaust
Beam energy can be absorbed.Detection beam energy based on absorption, detector can get the first absorption signal of vehicle exhaust.Letter
Number amplifier can amplify the first absorption signal, when detecting the first absorption signal and meeting preset condition, the second AD conversion
First absorption signal is converted into digital signal by device, and is sent to concentration calculation module.Concentration calculation module counts based on the received
Word signal can calculate the concentration of a certain gas componant in vehicle exhaust.The embodiment of the present application is by detecting that the first absorption is believed
When number meeting preset condition, the first absorption signal is converted into digital signal by the second converter, and is sent to concentration calculation mould
The sensitivity of gas concentration detection can be improved in block, the available gas concentration into vehicle exhaust.
Fig. 8 shows the flow diagram of the detection method of the vehicle exhaust of the embodiment of the present application.
As shown in figure 8, the detection method of the vehicle exhaust includes:
In S101, emit for the detection light beam across tail gas.
According to some embodiments, detecting light beam is emitted by detection device, which can be for passing through tail gas
Detect light beam.The light beam has specific wavelength.Since degree of absorption of the gas with various ingredient to laser energy is different.Detection dress
It sets when detecting different gas componants, detection device can receive am signals and frequency modulated signal simultaneously, in order to
To emit the detection light beam of different wave length.
In S102, the first absorption signal of tail gas is obtained.
According to some embodiments, the first absorption signal refers to that detection light beam passes through the deamplification generated when tail gas.Such as
When the detection light beam of detection device transmitting passes through vehicle exhaust, propane influences the transmission of detection light beam in vehicle exhaust, makes to examine
It surveys light beam and generates decaying.Detection device is available into vehicle exhaust by the deamplification of vehicle exhaust according to detection light beam
First absorption signal of propane.
In S103, when detecting that the first absorption signal does not meet preset condition, the second absorption signal is obtained, second absorbs letter
It number is the absorption signal carried out to the first absorption signal after locking phase enhanced processing.
According to some embodiments, when detection device gets the first absorption signal of tail gas, the first absorption letter can detecte
Number whether meet preset condition.When detection device detects that the first absorption signal does not meet preset condition, detection device can be with
Frequency-doubled signal is received, and locking phase enhanced processing is carried out to the first absorption signal, obtains the second absorption signal.The frequency-doubled signal is for example
It can be sinusoidal modulation signal.Since lock-in amplifier is when detecting the first absorption signal, lock-in amplifier itself, which can exist, makes an uproar
Acoustical signal.Therefore the preset condition of detection device can be 3 times that the intensity of the first absorption signal is noise signal, when detection fills
It sets and detects 3 times that first absorption signal is lower than noise signal, obtain second absorption signal, make an uproar so as to reduce
Influence of the acoustical signal to testing result.Wherein the preset condition of detection device can be adjusted according to actually detected situation.
Optionally, the preset condition of detection device setting for example can be 3 times that the first absorption signal is more than noise signal.
When detection device detecting the first absorption signal 2 times of noise signal, detection device locks first absorption signal
Phase enhanced processing gets the second absorption signal.
In S104, it is based on the second absorption signal, calculates the concentration of propane in tail gas.
It, can be using image recognition algorithm and dense when detection device gets the second absorption signal according to some embodiments
Computational algorithm is spent, the concentration of propane in tail gas is calculated.Since the signal of the concentration calculation module processing in detection device is
Digital signal, and the second absorption signal obtained after the processing of detection device lock-in amplifier is analog signal, therefore detects dress
Digital signal can be converted into for second signal by setting.
It can be readily appreciated that when detection device gets a plurality of absorption line chart of the first absorption signal of propane in vehicle exhaust
When picture, a certain absorption line image in a plurality of absorption line image can be recognized using image recognition algorithm.According to the Absorption Line
Image, detection device can use concentration calculation algorithm, the concentration of propane in tail gas are calculated.
It optionally, directly will amplification when detection device detects that amplified first absorption signal meets preset condition
The first absorption signal afterwards is converted into digital signal, and is sent to concentration calculation module.Concentration calculation module counts based on the received
Word signal can calculate the concentration of propane in vehicle exhaust.
It can be readily appreciated that the preset threshold of propane concentration in tail gas can be set in detection device.When the tail being calculated
When the concentration of propane is greater than the preset threshold in gas, the prompt information that propane concentration is exceeded in tail gas is issued.User gets this
When information, propane purification method can be used, the content of propane in tail gas is reduced.
The embodiment of the present application provides a kind of detection method of vehicle exhaust, comprising: emits the detection light beam of tail gas, detection light
Beam passes through tail gas, obtains the first absorption signal of tail gas, when detecting that the first absorption signal does not meet preset condition, obtains second
Absorption signal, the second absorption signal are the absorption signals carried out after locking phase enhanced processing to the first absorption signal, are inhaled based on second
The collection of letters number calculates the concentration of propane in tail gas.The embodiment of the present application is by detecting that the first absorption signal does not meet preset condition
When, the second absorption signal is obtained, gas concentration detection can be improved in the gas concentration of the available propane into vehicle exhaust
Sensitivity.
The application also provides a kind of computer readable storage medium, is stored thereon with computer program, and the program is processed
The step of above method is realized when device executes.Wherein, computer readable storage medium can include but is not limited to any kind of
Disk, including CD, DVD, CD-ROM, mini drive and magneto-optic disk, ROM, RAM, EPROM, EEPROM, DRAM, VRAM, sudden strain of a muscle
Fast memory devices, magnetic or optical card, nanosystems (including molecular memory IC), or it is suitable for store instruction and/or data
Any kind of medium or equipment.
The embodiment of the present application also provides a kind of computer program product, which includes storage computer journey
The non-transient computer readable storage medium of sequence, the computer program are operable to execute computer such as above method implementation
Some or all of the detection method for vehicle exhaust recorded in example step.
Those skilled in the art can be understood that the technical solution of the application can be come by software and/or hardware
It realizes." unit " and " module " in this specification refers to complete independently or cooperates with other component complete specific function
Software and/or hardware, wherein hardware for example can be field programmable gate array (Field-ProgrammaBLE Gate
Array, FPGA), integrated circuit (Integrated Circuit, IC) etc..
It should be noted that for the various method embodiments described above, for simple description, therefore, it is stated as a series of
Combination of actions, but those skilled in the art should understand that, the application is not limited by the described action sequence because
According to the application, some steps may be performed in other sequences or simultaneously.Secondly, those skilled in the art should also know
It knows, the embodiments described in the specification are all preferred embodiments, related actions and modules not necessarily the application
It is necessary.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
In several embodiments provided herein, it should be understood that disclosed device, it can be by another way
It realizes.For example, the apparatus embodiments described above are merely exemplary, such as the division of the unit, it is only a kind of
Logical function partition, there may be another division manner in actual implementation, such as multiple units or components can combine or can
To be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some service interfaces, device or unit
It connects, can be electrical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer-readable access to memory.Based on this understanding, the technical solution of the application substantially or
Person says that all or part of the part that contributes to existing technology or the technical solution can body in the form of software products
Reveal and, which is stored in a memory, including some instructions are used so that a computer equipment
(can be personal computer, server or network equipment etc.) executes all or part of each embodiment the method for the application
Step.And memory above-mentioned includes: USB flash disk, read-only memory (Read-Only Memory, ROM), random access memory
The various media that can store program code such as (Random Access Memory, RAM), mobile hard disk, magnetic or disk.
Those of ordinary skill in the art will appreciate that all or part of the steps in the various methods of above-described embodiment is can
It is completed with logical process sequence to instruct relevant hardware, which can store in a computer-readable memory, memory
It may include: flash disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access
Memory, RAM), disk or CD etc..
As described above, the only exemplary embodiment of the disclosure cannot limit the scope of the present disclosure with this.I.e. in every case according to
The disclosure instruct made by equivalent changes and modifications, all still belong in the range of the disclosure covers.Those skilled in the art are considering
Specification and after practicing disclosure herein, will readily occur to other embodiments of the disclosure.This application is intended to cover the disclosure
Any variations, uses, or adaptations, the generality that these variations, uses, or adaptations follow the disclosure is former
The common knowledge or conventional techniques in the art managed and do not recorded including the disclosure.Description and embodiments only by
It is considered as illustratively, the scope of the present disclosure and spirit are defined by the claims.
Claims (10)
1. a kind of detection device of vehicle exhaust characterized by comprising
Laser, for emitting the detection light beam of tail gas；
Detector, for obtaining the first absorption signal of the tail gas；
Lock-in amplifier, when for detecting that first absorption signal does not meet preset condition, to first absorption signal
Locking phase enhanced processing is carried out, the second absorption signal is obtained；
First converter, for second absorption signal to be converted into digital signal.
2. device as described in claim 1, which is characterized in that described device further include:
Frequency multiplier, for exporting frequency-doubled signal to the lock-in amplifier.
3. device as described in claim 1, which is characterized in that described device further include:
The concentration of propane in the tail gas is calculated for being based on second absorption signal in concentration calculation module.
4. device as described in claim 1, which is characterized in that described device further include:
Second converter for being converted into digital signal to first absorption signal, and is sent to the concentration calculation mould
Block.
5. a kind of detection method of vehicle exhaust characterized by comprising
Transmitting is for the detection light beam across tail gas；
Obtain the first absorption signal of the tail gas；
When detecting that first absorption signal does not meet preset condition, the second absorption signal, second absorption signal are obtained
It is the absorption signal carried out to first absorption signal after locking phase enhanced processing；
Based on second absorption signal, the concentration of propane in the tail gas is calculated.
6. method as claimed in claim 5, which is characterized in that it is described to be based on first absorption signal, calculate the tail gas
The concentration of middle propane includes:
When detecting that first absorption signal meets preset condition, it is based on first absorption signal, is calculated in the tail gas
The concentration of propane.
7. method as claimed in claim 6, which is characterized in that it is described that first absorption signal is amplified, it gets
After second absorption signal further include:
Processing is amplified to first absorption signal.
8. the method for claim 7, which is characterized in that described to detect that first absorption signal does not meet default item
When part, the second absorption signal is obtained, second absorption signal is after carrying out locking phase enhanced processing to first absorption signal
Absorption signal before include:
Receive frequency-doubled signal.
9. method as claimed in claim 5, which is characterized in that detect that first absorption signal does not meet preset condition
When, the second absorption signal is obtained, second absorption signal is after carrying out locking phase enhanced processing to first absorption signal
Absorption signal includes:
It detects that first absorption signal is lower than 3 times of noise signal, obtains second absorption signal.
10. method as claimed in claim 5, which is characterized in that it is described to be based on second absorption signal, calculate the tail gas
Include: before the concentration of middle propane
Second absorption signal is AD converted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910846217.7A CN110501305A (en) | 2019-09-09 | 2019-09-09 | A kind of detection device and method of vehicle exhaust |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910846217.7A CN110501305A (en) | 2019-09-09 | 2019-09-09 | A kind of detection device and method of vehicle exhaust |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110501305A true CN110501305A (en) | 2019-11-26 |
Family
ID=68591447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910846217.7A Pending CN110501305A (en) | 2019-09-09 | 2019-09-09 | A kind of detection device and method of vehicle exhaust |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110501305A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720799A (en) * | 2021-11-03 | 2021-11-30 | 华电智控（北京）技术有限公司 | Tail gas measuring method and device based on motor vehicle tail gas remote measuring system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798609A (en) * | 2012-08-20 | 2012-11-28 | 杭州电子科技大学 | Automobile exhaust remote sensing detection system and method based on quantum cascade laser |
| CN105319183A (en) * | 2015-11-13 | 2016-02-10 | 哈尔滨工程大学 | Detector and detection method for real-time on-line detection of emission smoke intensity of diesel engine |
| CN106383097A (en) * | 2016-11-16 | 2017-02-08 | 浙江多普勒环保科技有限公司 | Tunable-laser-based motor vehicle exhaust gas remote sensing detection system and method |
| CN107091808A (en) * | 2017-07-10 | 2017-08-25 | 西石（厦门）科技有限公司 | A kind of anti-interference of stray light photodetector system based on digital servo-control |
-
2019
- 2019-09-09 CN CN201910846217.7A patent/CN110501305A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798609A (en) * | 2012-08-20 | 2012-11-28 | 杭州电子科技大学 | Automobile exhaust remote sensing detection system and method based on quantum cascade laser |
| CN105319183A (en) * | 2015-11-13 | 2016-02-10 | 哈尔滨工程大学 | Detector and detection method for real-time on-line detection of emission smoke intensity of diesel engine |
| CN106383097A (en) * | 2016-11-16 | 2017-02-08 | 浙江多普勒环保科技有限公司 | Tunable-laser-based motor vehicle exhaust gas remote sensing detection system and method |
| CN107091808A (en) * | 2017-07-10 | 2017-08-25 | 西石（厦门）科技有限公司 | A kind of anti-interference of stray light photodetector system based on digital servo-control |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113720799A (en) * | 2021-11-03 | 2021-11-30 | 华电智控（北京）技术有限公司 | Tail gas measuring method and device based on motor vehicle tail gas remote measuring system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107014759A (en) | For the method and system for the influence for reducing the baseline distortion in absorption spectrum measurement | |
| Thurmond et al. | A light-emitting diode-(LED-) based absorption sensor for simultaneous detection of carbon monoxide and carbon dioxide | |
| Patel | Laser detection of pollution | |
| CN106168577A (en) | Vehicular exhaust many pollutions component real-time telemetry method and apparatus | |
| US9851292B2 (en) | Particle detection device | |
| Shahlari et al. | Correlation of cylinder pressure–based engine noise metrics to measured microphone data | |
| Burgard et al. | Nitrogen dioxide, sulfur dioxide, and ammonia detector for remote sensing of vehicle emissions | |
| EP2341338A1 (en) | Exhaust opacity measuring device | |
| CN102116735A (en) | System and method for remote sensing measurement of automobile emissions | |
| Momenimovahed et al. | Effect of fuel composition on properties of particles emitted from a diesel–natural gas dual fuel engine | |
| CN110501305A (en) | A kind of detection device and method of vehicle exhaust | |
| CN105136675A (en) | Poisonous and harmful gas concentration on-line testing method | |
| Jatana et al. | High-speed diode laser measurements of temperature and water vapor concentration in the intake manifold of a diesel engine | |
| JP4018799B2 (en) | Method and apparatus for measuring concentration of absorption component of scattering medium | |
| CN113720799B (en) | Tail gas measuring method and device based on motor vehicle tail gas remote measuring system | |
| Guardiola et al. | An on-board method to estimate the light-off temperature of diesel oxidation catalysts | |
| CN110865042A (en) | Gas concentration detection method, device and system | |
| CN106483098A (en) | The alcohol gas concentration method of telemetering based on tunable laser | |
| CN205538639U (en) | Gas analysis appearance air chamber device | |
| Uthe | Airborne CO 2 DIAL measurement of atmospheric tracer gas concentration distributions | |
| Zhang et al. | Simultaneous detection of multiple gas concentrations with multi-frequency wavelength modulation spectroscopy | |
| Barrass et al. | Near-infrared tunable diode laser spectrometer for the remote sensing of vehicle emissions | |
| CN103575696B (en) | A kind of method and device detecting target gas levels | |
| CN213633165U (en) | Nitrogen oxide measuring system based on laser spectrum absorption method | |
| Tarumi et al. | Remote detection of heated ethanol plumes by airborne passive Fourier transform infrared spectrometry |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191126 |