CN105319178B - Motor-vehicle tail-gas CO and CO2Concentration real-time detecting system and its control method - Google Patents
Motor-vehicle tail-gas CO and CO2Concentration real-time detecting system and its control method Download PDFInfo
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- CN105319178B CN105319178B CN201510716165.3A CN201510716165A CN105319178B CN 105319178 B CN105319178 B CN 105319178B CN 201510716165 A CN201510716165 A CN 201510716165A CN 105319178 B CN105319178 B CN 105319178B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 193
- 238000001514 detection method Methods 0.000 claims abstract description 83
- 238000012545 processing Methods 0.000 claims abstract description 24
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 238000001228 spectrum Methods 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims 2
- 238000007789 sealing Methods 0.000 claims 1
- 238000002329 infrared spectrum Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 26
- 239000006185 dispersion Substances 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
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- 230000003595 spectral effect Effects 0.000 description 2
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
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- 238000013500 data storage Methods 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 230000001678 irradiating effect Effects 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000001745 non-dispersive infrared spectroscopy Methods 0.000 description 1
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- 230000000704 physical effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—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
Abstract
The invention belongs to the Gas Thickness Detecting Technology field based on infrared spectrum, more particularly to a kind of motor-vehicle tail-gas CO and CO2Concentration real-time detecting system, to be detected first, there are overlapping region for the absorption spectrum of two gases, including first gas detection unit and second gas detection unit, first sample cell of the first gas detection unit includes first, two chambers, the second gas of 100% concentration is filled with first chamber, gas to be detected is passed through in second sample cell of second chamber and second gas detection unit, the infrared light that light source projects passes through first, electric signal output is converted into after two gas detection cells to processing unit, processing unit obtains first after being handled, the concentration of two gases, and disclose the control method of the system.By setting two chambers in wherein first gas detection unit, the second gas of 100% concentration is filled with one of chamber, can thus eliminate the interference that second gas detects first gas.
Description
Technical field
The invention belongs to the Gas Thickness Detecting Technology field based on infrared spectrum, more particularly to a kind of motor-vehicle tail-gas CO
And CO2Concentration real-time detecting system and its control method.
Background technology
With the rapid development of social economy, the ownership of motor vehicle is also consequently increased rapidly.The popularization of motor vehicle gives people
While people's livelihood work brings great convenience, serious environmental problem is also result in, motor-vehicle tail-gas has become air at present
Primary pollution source.CO and CO2It is one of main harmful components in motor-vehicle tail-gas, according to statistics, 20% in urban air pollution
CO2, 60~70% CO comes from motor-vehicle tail-gas.The discharge standard promulgated is to CO in motor-vehicle tail-gas and CO2It is dense
Degree has stringent limitation, in order to ensure that these regulations are effectively implemented, it is necessary to development accurate reliable motor-vehicle tail-gas CO and CO2Concentration
Real-time detecting system.
Non-dispersion infrared (Nondispersive Infrared, NDIR) detecting system is one kind by measuring under test gas
Molecule obtains the gas detecting system of under test gas concentration to the absorption intensity of infrared light specific band energy, has structure letter
List, can measure multiple gases at the same time, and high sensitivity, responds the features such as fast.Non-dispersion infrared detecting system be current detection CO and
CO2The most commonly used system of concentration.Existing non-dispersion infrared detecting system is used for motor-vehicle tail-gas CO and CO2Concentration Testing is deposited
In following deficiency：(1) non-dispersion infrared detecting system depends primarily upon absorption light path to the detection sensitivity of certain under test gas,
To obtain optimal detection sensitivity, the selection for absorbing light path should be dense to the absorption intensity of infrared light and detection according under test gas
Spend scope to determine, existing non-dispersion infrared detecting system is completed to CO and CO in simple sample pond2The detection of concentration, i.e. CO and
CO2Detection light path it is identical, but CO concentration is generally 1~3%, CO in tail gas2Concentration is generally higher than 10%, and CO2To infrared light
Absorptance CO it is stronger, according to above-mentioned detection light path selection criteria, CO2Detection light path should be significantly smaller than the detection light path of CO,
The design in simple sample pond cannot meet CO and CO at the same time2The requirement of high detection sensitivity；(2) existing non-dispersion infrared detection
The CO measurement wave bands and CO that system uses2Infrared absorption spectroscopy is there are overlapping, due to CO in tail gas2It is dense, to infrared light
Absorption intensity is big, CO2On influencing to ignore caused by infrared energy change in CO measurement wave bands, if without calibrating,
CO Concentration Testings resultant error can be very big.Merely just with CO and CO2Exemplified by, in fact, existing for other absorption spectrums
When overlapping and two other big gases of gas concentration difference are detected, the big phenomenon of error can all occur.
The content of the invention
The primary and foremost purpose of the present invention is to provide a kind of highly sensitive motor-vehicle tail-gas CO and CO2The real-time detection system of concentration
System, can efficiently and accurately detect two kind gas concentrations of the absorption spectrum there are overlapping phenomenon.
In order to achieve the above object, the technical solution adopted by the present invention is：A kind of motor-vehicle tail-gas CO and CO2Concentration is real-time
Detecting system, there are overlapping region, including first gas detection unit and second for the absorption spectrum of first and second gas to be detected
Gas detection cell, the first sample cell of the first gas detection unit include first and second chamber, are filled with first chamber
Gas to be detected is passed through in second sample cell of the second gas of 100% concentration, second chamber and second gas detection unit,
The infrared light that light source projects is converted into electric signal output to processing unit, processing unit after first and second gas detection cell
The concentration of first and second gas is obtained after being handled.
Compared with prior art, there are following technique effect by the present invention：By being set in wherein first gas detection unit
Two chambers are put, the second gas of 100% concentration is filled with one of chamber, can thus eliminate second gas to first
The interference of gas detection.
It is another object of the present invention to provide a kind of highly sensitive motor-vehicle tail-gas CO and CO2Concentration detects in real time
System, can efficiently and accurately detect two kind gas concentrations of the absorption spectrum there are overlapping phenomenon.
In order to achieve the above object, the technical solution adopted by the present invention is：A kind of motor-vehicle tail-gas CO and CO2Concentration is real-time
The control method of detecting system, includes the following steps：(A) detecting system is preheated；(B) examined according to the concentration of first gas
Survey 0≤C of scope≤CMAX1Selected one group is demarcated concentration C at equal intervalsm, wherein m=0,1,2,3 ..., x and C0=0, Cx=CMAX1；To
Concentration is passed through in second chamber successively and is equal to calibration concentration CmFirst gas, and according to each calibration concentration under first gas
The signal amplitude U of detection unit output1mObtain x+1 group data { Cm、U1m}；(C) according to the Concentration Testing scope 0 of second gas
≤C≤CMAX2Selected one group is demarcated concentration C at equal intervalsn, wherein n=0,1,2,3 ..., y and C0=0, Cy=CMAX2；To the 3rd chamber
Concentration is passed through in room successively and is equal to calibration concentration CnSecond gas, and detected according to second gas under each calibration concentration single
The signal amplitude U of member output2nObtain y+1 group data { Cn、U2n}；(D) gas to be detected is passed through into second and third chamber, is located
The signal amplitude U that reason unit is exported according to first gas detection unit1And data { the C in step Bm、U1mBy linearly inserting
Value method obtains first gas concentration；The signal amplitude U that processing unit is exported according to second gas detection unit2And in step C
Data { Cn、U2nSecond gas concentration obtained by linear interpolation method.
Compared with prior art, there are following technique effect by the present invention：Pass through the of step B and step C normal concentrations
First, the benchmark of the data that two gases detect as reference so that follow-up processing only just can basis by linear interpolation algorithm
The signal amplitude detected obtains corresponding gas concentration, and processing is quick, simple, accurate.
Brief description of the drawings
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is spectrophotometric unit of the present invention and the structure diagram of first, second and third gas detection cell.
Embodiment
With reference to Fig. 1 to Fig. 2, the present invention is described in further detail.
Refering to Fig. 1, Fig. 2, a kind of motor-vehicle tail-gas CO and CO2Concentration real-time detecting system, first and second gas to be detected
Absorption spectrum there are overlapping region, including first gas detection unit 30 and second gas detection unit 40, first gas
First sample cell 31 of body detection unit 30 includes first and second chamber 34,35, and 100% concentration is filled with first chamber 34
Gas to be detected, light source are passed through in second sample cell 41 of second gas, second chamber 35 and second gas detection unit 40
10 infrared lights projected are converted into electric signal output to processing unit 60, processing after first and second gas detection cell 30,40
Unit 60 obtains the concentration of first and second gas after being handled.Here by setting the first chamber in first gas detection unit
Room 34, and the second gas of 100% concentration is filled in first chamber 34, thus eliminating the need second gas to first gas
Influence, improve first gas accuracy of detection.First and second gas detection cell 30,40 is examined using gas commonly used in the prior art
Examining system.
Gas detecting system has various structures mode, a kind of more specific embodiment of offer here, and described first
Gas detection cell 30 includes the first infrared fileter 32 and the first detector 33, and second gas detection unit 40 includes second
42 and second detector 43 of infrared fileter；First and second infrared fileter 32,42 is located at first and second respectively through spectrum
In gas infrared absorption wave band, through first and second sample cell 31,41 infrared light respectively by first and second infrared fileter 32,
Received after 42 by first and second detector 33,43.Here first and second detector 33,43 is thermocouple probe, with detection
Element is absorbed into infra-red radiation and produces heat, causes temperature rise, and by various physical effects temperature rise is converted into defeated after electric signal
Go out.
As the preferred solution of the present invention, since the infrared light supply radiant power of light source 10 has fluctuation, in order to eliminate this
A fluctuation influence, the present embodiment caused by result include third gas detection unit 50, and third gas detection unit 50 is wrapped
The 3rd sample cell 51, the 3rd infrared fileter 52 and the 3rd detector 53 are included, the 3rd infrared fileter 52 passes through spectrum position
Beyond first and second gas infrared absorption wave band, through the 3rd sample cell 51 infrared light after the 3rd infrared fileter 52
Received by the 3rd detector 53.After setting third gas detection unit 50, the fluctuation of light source 10 is in first, second and third gas
There is embodiment in detection unit 30,40,50, when processing unit 60 is handled, no longer individually first and second gas is examined
Survey unit 30,40 output result handled, but the ratio between output amplitude to first and third gas detection cell 30,50 with
And the ratio between output amplitude of second and third gas detection cell 40,50 is handled, eliminate the need for light source 10 and fluctuate caused detection
Error.
Specifically, first, second and third sample cell 31,41,51 is the circular tube shaped pond body of uniform internal diameter, by each sample
The internal diameter in pond is arranged to equal, just can determine the chamber in each sample pond according to the length of first, second and third sample cell 31,41,51
Volume size.The both ends of first sample cell 31 and the middle window 70 for being both provided with permeable infra-red radiation, window 70 is by the
A sample pond 31 is divided into first and second chamber 34,35, and the both ends of second and third sample cell 41,51 seal shape with window 70
Into third and fourth chamber 44,54；Here all windows 70 are all that can pass through infra-red radiation.In order to ensure to first and second gas
Detection sensitivity reach highest at the same time, here preferably, the 3rd chamber 44 is equal to first and second with 35 lenth ratio of second chamber
The ratio between gas maximum detection range, it is assumed that the detection range of first gas is 0%-10%, and the detection range of second gas is
0%-20%, then the ratio between maximum detection range of first and second gas is exactly 10%/20%, equal to 1:2, the 3rd chamber 44 with
The also just selection 1 of the length ratio of second chamber 35:2.
Preferably, first and third, two sample cells 31,41,51 are arranged in parallel from top to bottom；Second and third chamber 35,
Outlet, inlet mouth 311,411 is respectively arranged with 44 periphery wall, between 35 and the 4th chamber 54 of second chamber, the 3rd chamber 44
And the 4th connected by pipe 80 between chamber 54.Pipe 80 is set to connect second chamber 35, the 4th chamber 54, the 3rd chamber 44
Gas-detecting cavity room is collectively formed, gas to be detected enters gas-detecting cavity room by air inlet 411 and discharged again by gas outlet 311.
In order to ensure equably to be full of gas to be detected, the gas outlet 311 of second chamber 35 and pipe in gas-detecting cavity room
Chamber where interface, the air inlet 411 of the 3rd chamber 44 and interface tube, two interface tubes of the 4th chamber 54 are placed in
Both ends, interface tube, that is, pipe 80 and each chamber connection, this section words it can be appreciated that：311 He of gas outlet of second chamber 35
Interface tube in second chamber 35 is located at the both ends along its length of second chamber 35 and gas outlet 311, pipe 80, the first sample
31 three axle center of pond is coplanar and gas outlet 311 and pipe 80 are postponed in the opposite direction.Similarly, the air inlet on the 3rd chamber 44
411 and interface tube be also identical arrangement；Two interface tubes on 4th chamber 54 are also arranged in the same way.So set
After putting, the gas to be detected that enters from air inlet 411 can fill uniformly with full 3rd chamber 44, the 4th chamber 54 and
Second chamber 35.
As the preferred solution of the present invention, first and second gas is CO, CO respectively2, the first infrared fileter 32
It is located at through spectrum in CO infrared absorption wave bands, the second infrared fileter 42 is located at CO through spectrum2Infrared absorption wave band
Interior, the 3rd infrared fileter 52 is located at CO and CO through spectrum2Outside infrared absorption wave band.Specifically, the first infrared filtering
The transmission spectral centroid wavelength of piece 32 is 4.64 μm, halfwidth 180nm；Second infrared fileter 42 passes through spectral centroid ripple
A length of 4.43 μm, halfwidth 60nm；The centre wavelength through spectrum of 3rd infrared fileter 53 is 4 μm, halfwidth is
90nm.When applying the detection in vehicle exhaust, the detection range of CO is 0%-10%, CO2Detection range be 0%-
20%, as described above and proportionate relationship, described second, four chambers 35,54 are isometric, and first and third chamber 34,44 is isometric
And second chamber 35 is twice of 44 length of the 3rd chamber, the CO in first chamber 342Gas pressure intensity is a standard atmospheric pressure.
Due to there are multiple gas detection cells, if arranging multiple light sources 10, being had differences certainly between each light source 10,
It is easy to cause result treatment error.In the present embodiment preferably, the light source 10 has one, the infrared light warp that light source 10 projects
Cross after spectrophotometric unit 20 is divided into three beams and respectively enter first, second and third sample cell 31,41,51, by spectrophotometric unit by a light source
10 points are the identical light beam of three beams, can eliminate error.In the present embodiment, 20 specific structure of spectrophotometric unit is additionally provided：
Spectrophotometric unit 20 includes collimation lens 21, the first beam splitter 22, the second beam splitter 23 and speculum 24, the first beam splitting here
Mirror 22, the second beam splitter 23 and speculum 24 are plane mirror, and the splitting ratio of first and second beam splitter 22,23 is 30:70, instead
The reflectivity for penetrating mirror 24 is more than 99%.The infrared light that light source 10 projects becomes collimated light beam after collimation lens 21；Directional light
Beam beam splitting after the first beam splitter 22 is the first the reflected beams and the first transmitted light beam, and the first the reflected beams enter the second sample
Pond 41, beam splitting is the second the reflected beams and the second transmitted light beam after the first transmitted light beam incides the second beam splitter 23, and second is anti-
Irradiating light beam enters the 3rd sample cell 51, and the second transmitted light beam enters the first sample cell 31 after the reflection of speculum 24.Specifically exist
During arrangement, the first beam splitter 22, the second beam splitter 23, speculum 24 center respectively positioned at the second sample cell, the 3rd sample cell,
Placed on the axial line of first sample cell and with axial line in 45° angle, side of first beam splitter 22 away from the second beam splitter 23
It is placed with collimation lens 21 and light source 10, light source 10, collimation lens 21, the first beam splitter 22, the second beam splitter 23, reflection
The center of mirror 24 is respectively positioned on same straight line.
Present invention also offers a kind of motor-vehicle tail-gas CO and CO2The control method of concentration real-time detecting system, including such as
Lower step：(A) detecting system is preheated；(B) according to 0≤C of Concentration Testing scope≤C of first gasMAX1It is one group selected
Concentration C is demarcated at equal intervalsm, wherein m=0,1,2,3 ..., x and C0=0, Cx=CMAX1；It is passed through successively into second chamber 35 dense
Degree is equal to calibration concentration CmFirst gas, and according to each calibration concentration under first gas detection unit 30 export signal
Amplitude U1mObtain x+1 group data { Cm、U1m}；(C) according to 0≤C of Concentration Testing scope≤C of second gasMAX2It is one group etc. selected
Interval calibration concentration Cn, wherein n=0,1,2,3 ..., y and C0=0, Cy=CMAX2；Concentration is passed through successively into the 3rd chamber 44
Equal to calibration concentration CnSecond gas, and according to each calibration concentration under second gas detection unit 40 export signal width
Value U2nObtain y+1 group data { Cn、U2n}；(D) gas to be detected, processing unit 60 are passed through into second and third chamber 35,44
The signal amplitude U exported according to first gas detection unit 301And data { the C in step Bm、U1mObtained by linear interpolation method
To first gas concentration；The signal amplitude U that processing unit 60 is exported according to second gas detection unit 402And in step C
Data { Cn、U2nSecond gas concentration obtained by linear interpolation method.
Here first and second gas testing result of various concentrations is demarcated by step B, C, the data storage of calibration
In processing unit.Just need to be demarcated only during use first, can be carried out measuring after calibration, if
When system detectio is inaccurate after the long period is detected, calibration can be re-started.The process of calibration is equivalent at one
Ruler subscript high scale, after having a scale, it is possible to the other length of measurement.When calibration, the scale of calibration is got over
More, i.e. parameter x, y in step B and C takes bigger, and calibration process is more complicated, but correspondingly, and the precision subsequently measured is also more
It is high.During practical application, suitable x, a y are selected.
In addition in step D, calculated by linear interpolation algorithm, the data that can also be obtained according to step B
{Cm、U1mFit functional relation：Signal amplitude, then only need to be brought into the function by concentration=f (signal amplitude) in step D
In with regard to corresponding concentration can be obtained.
As the preferred solution of the present invention, third gas detection unit 50 is further included here, in the step B, to the
It is passed through concentration in two chambers 35 and the 4th chamber 54 successively at the same time and is equal to calibration concentration CmFirst gas, and according to each mark
Determine the signal amplitude U that first and third gas detection cell 30,50 exports under concentration1m、U3mObtain x+1 group data { Cm、R1m, its
Middle R1m=U1m/U3m；In the step C, concentration is passed through successively at the same time into the 3rd chamber 44 and the 4th chamber 54 equal to calibration
Concentration CnSecond gas, and according to each calibration concentration under second and third gas detection cell 40,50 export signal amplitude
U2n、U3nObtain y+1 group data { Cn、R2n}；Wherein R2n=U2n/U3n；In the step D, to second and third, four chambers 35,
44th, gas to be detected, the letter that processing unit 60 is exported according to first, second and third gas detection cell 30,40,50 are passed through in 54
Number amplitude U1、U2、U3Ratio calculated R1、R2, wherein R1=U1/U3, R2=U2/U3；Processing unit 60 is according to R1And in step B
Data { Cm、R1mFirst gas concentration obtained by linear interpolation method；Processing unit is according to R2And data { the C in step Cn、
R2nSecond gas concentration obtained by linear interpolation method.Above it is stated that, third gas detection unit 50 is set to have
Prevent to effect light source 10 to fluctuate the influence caused by testing result, reduce error.After third gas detection unit 50 is set, this
In handled by the ratio of the signal amplitude exported to first, second and third gas detection cell 30,40,50, to obtain phase
The concentration value answered, as a result can be more accurate, and signal amplitude ratio R here reduces with the increase of concentration.Similarly, here
Concentration, the ratio functional relation between the two of signal amplitude can also be obtained by the data of calibration, then according to the function
Concentration value is calculated in relation.
Linear interpolation method is explained in detail below, the linear interpolation method includes the following steps：(S1) basis
Data { R11、R12、R13、…、R1xDetermine R1Residing section [R1a, R1b], wherein b=a+1, R1a＞ R1＞ R1b；(S2) basis
First gas concentration is calculated in equation below：
C in the formulaa、CbIt is R respectively1a、R1bCorresponding first gas concentration value；(S3) according to data { R21、
R22、R23、…、R2yDetermine R2Residing section [R2a, R2b], wherein b=a+1, R2a＞ R2＞ R2b；(S2) according to equation below
Second gas concentration is calculated：
C in the formulaa、CbIt is R respectively2a、R2bCorresponding second gas concentration value.Briefly, it is exactly according to R1
And R2Value, bring the data stored in processing unit 60 into concentration value that formula obtains first and second gas.
Claims (8)
- A kind of 1. motor-vehicle tail-gas CO and CO2Concentration real-time detecting system, the absorption spectrum of first and second gas to be detected exist Overlapping region, it is characterised in that：Including first gas detection unit (30) and second gas detection unit (40), first gas The first sample cell (31) of body detection unit (30) includes first and second chamber (34,35), and first chamber is filled with (34) Lead in the second sample cell (41) of the second gas of 100% concentration, second chamber (35) and second gas detection unit (40) Enter gas to be detected, the infrared light that light source (10) projects is converted into electric signal after first and second gas detection cell (30,40) Output to processing unit (60), processing unit (60) obtains the concentration of first and second gas after being handled；Including third gas detection unit (50), third gas detection unit (50) includes the 3rd sample cell (51), the 3rd infrared Optical filter (52) and the 3rd detector (53), the 3rd infrared fileter (52) through spectrum, to be located at first and second gas infrared Beyond absorption bands, through the 3rd sample cell (51) infrared light after the 3rd infrared fileter (52) by the 3rd detector (53) received；First, second and third sample cell (31,41,51) is the circular tube shaped pond body of uniform internal diameter, and the two of the first sample cell (31) First sample cell (31) is divided into described by end and the middle window (70) for being both provided with permeable infra-red radiation, window (70) First and second chamber (34,35), the both ends of second and third sample cell (41,51) form third and fourth chamber with window (70) sealing (44、54)；3rd chamber (44) is equal to the ratio between first and second gas maximum detection range with second chamber (35) lenth ratio.
- 2. motor-vehicle tail-gas CO and CO as claimed in claim 12Concentration real-time detecting system, it is characterised in that：Described first Gas detection cell (30) includes the first infrared fileter (32) and the first detector (33), second gas detection unit (40) Including the second infrared fileter (42) and the second detector (43)；First and second infrared fileter (32,42) divides through spectrum Not Wei Yu in first and second gas infrared absorption wave band, through first and second sample cell (31,41) infrared light respectively by first, Received after two infrared fileters (32,42) by first and second detector (33,43).
- 3. motor-vehicle tail-gas CO and CO as claimed in claim 12Concentration real-time detecting system, it is characterised in that：Described First, three, two sample cells (31,51,41) are arranged in parallel from top to bottom；Set respectively on the periphery wall of second and third chamber (35,44) There is outlet, inlet mouth (311,411), between second chamber (35) and the 4th chamber (54), the 3rd chamber (44) and the 4th chamber (54) connected between by pipe (80)；The gas outlet (311) of second chamber (35) and interface tube, the air inlet of the 3rd chamber (44) The both ends of chamber where mouth (411) and interface tube, two interface tubes of the 4th chamber (54) are placed in.
- 4. motor-vehicle tail-gas CO and CO as claimed in claim 12Concentration real-time detecting system, it is characterised in that：Described First, two gases are CO, CO respectively2, the first infrared fileter (32) is located in CO infrared absorption wave bands through spectrum, and second is red Outer optical filter (42) is located at CO through spectrum2In infrared absorption wave band, the 3rd infrared fileter (52) is located at through spectrum CO and CO2Outside infrared absorption wave band；Second, four chambers (35,54) are isometric, first and third chamber (34,44) it is isometric and Second chamber (35) is twice of the 3rd chamber (44) length, the CO in first chamber (34)2Gas pressure intensity is big for a standard Air pressure.
- 5. motor-vehicle tail-gas CO and CO as claimed in claim 12Concentration real-time detecting system, it is characterised in that：The light source (10) there is one, the infrared light that light source (10) projects respectively enters first, second and third sample after spectrophotometric unit (20) is divided into three beams Product pond (31,41,51)；Spectrophotometric unit (20) include collimation lens (21), the first beam splitter (22), the second beam splitter (23) and Speculum (24), the infrared light that light source (10) projects become collimated light beam after collimation lens (21)；Collimated light beam is by the Beam splitting is the first the reflected beams and the first transmitted light beam to one beam splitter (22) afterwards, and the first the reflected beams enter the second sample cell (41), the first transmitted light beam incides the second beam splitter (23) beam splitting is the second the reflected beams and the second transmitted light beam afterwards, and second The reflected beams enter the 3rd sample cell (51), and the second transmitted light beam enters the first sample cell after speculum (24) reflection (31), the splitting ratio of first and second beam splitter (22,23) is 30:70.
- 6. a kind of motor-vehicle tail-gas CO and CO as claimed in claim 12The control method of concentration real-time detecting system, including it is as follows Step：(A) detecting system is preheated；(B) according to 0≤C of Concentration Testing scope≤C of first gasMAX1Selected one group is demarcated concentration C at equal intervalsm, wherein m=0, 1st, 2,3 ..., x and C0=0, Cx=CMAX1；It is passed through concentration successively into second chamber (35) and is equal to calibration concentration CmThe first gas Body, and according to the signal amplitude U that first gas detection unit (30) exports under each calibration concentration1mObtain x+1 group data {Cm、U1m}；(C) according to 0≤C of Concentration Testing scope≤C of second gasMAX2Selected one group is demarcated concentration C at equal intervalsn, wherein n=0, 1st, 2,3 ..., y and C0=0, Cy=CMAX2；It is passed through concentration successively into the 3rd chamber (44) and is equal to calibration concentration CnThe second gas Body, and according to the signal amplitude U that second gas detection unit (40) exports under each calibration concentration2nObtain y+1 group data {Cn、U2n}；(D) gas to be detected is passed through into second and third chamber (35,44), processing unit (60) detects single according to first gas The signal amplitude U of first (30) output1And data { the C in step Bm、U1mFirst gas concentration obtained by linear interpolation method； The signal amplitude U that processing unit (60) is exported according to second gas detection unit (40)2And data { the C in step Cn、U2n} Second gas concentration is obtained by linear interpolation method.
- 7. motor-vehicle tail-gas CO and CO as claimed in claim 62The control method of concentration real-time detecting system, it is characterised in that： Including third gas detection unit (50),In the step (B), concentration is passed through successively at the same time into second chamber (35) and the 4th chamber (54) equal to calibration Concentration CmFirst gas, and according to each calibration concentration under first and third gas detection cell (30,50) export signal width Value U1m、U3mObtain x+1 group data { Cm、R1m, wherein R1m=U1m/U3m；In the step (C), concentration is passed through successively at the same time into the 3rd chamber (44) and the 4th chamber (54) equal to calibration Concentration CnSecond gas, and according to each calibration concentration under second and third gas detection cell (40,50) export signal width Value U2n、U3nObtain y+1 group data { Cn、R2n}；Wherein R2n=U2n/U3n；In the step (D), to second and third, four chambers be passed through gas to be detected, processing unit in (35,44,54) (60) the signal amplitude U exported according to first, second and third gas detection cell (30,40,50)1、U2、U3Ratio calculated R1、R2, its Middle R1=U1/U3, R2=U2/U3；Processing unit (60) is according to R1And data { the C in step Bm、R1mPass through linear interpolation method Obtain first gas concentration；Processing unit is according to R2And data { the C in step Cn、R2nBy linear interpolation method obtain second Gas concentration.
- 8. motor-vehicle tail-gas CO and CO as claimed in claim 62The control method of concentration real-time detecting system, it is characterised in that： The linear interpolation method includes the following steps：(S1) according to data { R11、R12、R13、…、R1xDetermine R1Residing section [R1a, R1b], wherein b=a+1, R1a≤R1≤ R1b；(S2) first gas concentration is calculated according to equation below：C in the formulaa、CbIt is R respectively1a、R1bCorresponding first gas concentration value；(S3) according to data { R21、R22、R23、…、R2yDetermine R2Residing section [R2a, R2b], wherein b=a+1, R2a≤R2≤ R2b；(S2) second gas concentration is calculated according to equation below：C in the formulaa、CbIt is R respectively2a、R2bCorresponding second gas concentration value.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052553A (en) * | 1989-11-08 | 1991-06-26 | 哈特曼·希劳恩股份公司 | The non-dispersive infrared gas analyser of multiple constituent concentration in the energy while measurement gas sample |
| EP1092971A2 (en) * | 1999-10-15 | 2001-04-18 | Li-Cor, Inc. | Gas analyzer |
| CN1462874A (en) * | 2003-06-24 | 2003-12-24 | 清华大学 | Method and device for measuring density of carbon monoxide in flue gases of combustion equipment |
| CN101231240A (en) * | 2008-01-30 | 2008-07-30 | 中国人民解放军海军医学研究所 | Apparatus and method for measuring carbon monoxide concentration |
| CN101281125A (en) * | 2008-05-19 | 2008-10-08 | 安徽敏测光电科技有限公司 | Method and apparatus for monitoring intelligent infrared multi-component harmful gas |
| CN101504367A (en) * | 2009-03-10 | 2009-08-12 | 哈尔滨工业大学 | Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide |
| CN101893558A (en) * | 2010-06-30 | 2010-11-24 | 合肥科大立安安全技术有限责任公司 | Three-component fire gas detector |
| CN102183481A (en) * | 2011-01-18 | 2011-09-14 | 江苏远望仪器有限公司 | Gas infrared absorption detection device |
| CN102608028A (en) * | 2012-02-22 | 2012-07-25 | 淄博立伟自动化监控设备有限公司 | Infrared online data processing and controlling device and method of beam tube |
| CN102830070A (en) * | 2012-08-30 | 2012-12-19 | 昆山昱翌辉华电子科技有限公司 | Apparatus and method for simultaneously monitoring sulfur dioxide and nitric oxide gas concentration by using diode laser |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148189A (en) * | 2000-11-10 | 2002-05-22 | Horiba Ltd | Analyzer |
-
2015
- 2015-10-27 CN CN201510716165.3A patent/CN105319178B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1052553A (en) * | 1989-11-08 | 1991-06-26 | 哈特曼·希劳恩股份公司 | The non-dispersive infrared gas analyser of multiple constituent concentration in the energy while measurement gas sample |
| EP1092971A2 (en) * | 1999-10-15 | 2001-04-18 | Li-Cor, Inc. | Gas analyzer |
| CN1462874A (en) * | 2003-06-24 | 2003-12-24 | 清华大学 | Method and device for measuring density of carbon monoxide in flue gases of combustion equipment |
| CN101231240A (en) * | 2008-01-30 | 2008-07-30 | 中国人民解放军海军医学研究所 | Apparatus and method for measuring carbon monoxide concentration |
| CN101281125A (en) * | 2008-05-19 | 2008-10-08 | 安徽敏测光电科技有限公司 | Method and apparatus for monitoring intelligent infrared multi-component harmful gas |
| CN101504367A (en) * | 2009-03-10 | 2009-08-12 | 哈尔滨工业大学 | Apparatus for simultaneously monitoring concentration of carbon monoxide and carbon dioxide |
| CN101893558A (en) * | 2010-06-30 | 2010-11-24 | 合肥科大立安安全技术有限责任公司 | Three-component fire gas detector |
| CN102183481A (en) * | 2011-01-18 | 2011-09-14 | 江苏远望仪器有限公司 | Gas infrared absorption detection device |
| CN102608028A (en) * | 2012-02-22 | 2012-07-25 | 淄博立伟自动化监控设备有限公司 | Infrared online data processing and controlling device and method of beam tube |
| CN102830070A (en) * | 2012-08-30 | 2012-12-19 | 昆山昱翌辉华电子科技有限公司 | Apparatus and method for simultaneously monitoring sulfur dioxide and nitric oxide gas concentration by using diode laser |
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