CN106680235A - Active circulating gas suction type infrared multi-light path gas concentration measurement device - Google Patents
Active circulating gas suction type infrared multi-light path gas concentration measurement device Download PDFInfo
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- CN106680235A CN106680235A CN201710082020.1A CN201710082020A CN106680235A CN 106680235 A CN106680235 A CN 106680235A CN 201710082020 A CN201710082020 A CN 201710082020A CN 106680235 A CN106680235 A CN 106680235A
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- 238000005259 measurement Methods 0.000 title claims abstract description 30
- 230000003287 optical effect Effects 0.000 claims abstract description 54
- 230000007246 mechanism Effects 0.000 claims abstract description 10
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- 239000007789 gas Substances 0.000 description 72
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- 238000013461 design Methods 0.000 description 11
- 238000002834 transmittance Methods 0.000 description 11
- 238000005299 abrasion Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 7
- 230000004044 response Effects 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000004043 responsiveness Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- YBNMDCCMCLUHBL-UHFFFAOYSA-N (2,5-dioxopyrrolidin-1-yl) 4-pyren-1-ylbutanoate Chemical compound C=1C=C(C2=C34)C=CC3=CC=CC4=CC=C2C=1CCCC(=O)ON1C(=O)CCC1=O YBNMDCCMCLUHBL-UHFFFAOYSA-N 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
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- 238000009792 diffusion process Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- 230000036632 reaction speed Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- GGYFMLJDMAMTAB-UHFFFAOYSA-N selanylidenelead Chemical compound [Pb]=[Se] GGYFMLJDMAMTAB-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 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
- G01N21/3518—Devices using gas filter correlation techniques; Devices using gas pressure modulation techniques
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Abstract
The invention discloses an active circulating gas suction type infrared multi-light path gas concentration measurement device, which comprises a multi-circulation gas suction chamber and an infrared multi-light path optical system; the multi-circulation gas suction chamber comprises a gas inlet arranged on the gas suction chamber, a gas suction pump communicating with the gas inlet, and a gas flow cavity corresponding to the gas suction pump, the gas suction chamber is provided with a gas outlet at the tail end of the gas flow cavity, and one side of the gas flow cavity communicates with a filter; the infrared multi-light path optical system comprises a circulation cavity which communicates with the filter, infrared multi-light path gas measurement mechanisms are symmetrically arranged in the circulation cavity, a circulating gas hole is arranged in the circulation cavity, and the circulating gas hole communicates with the gas inlet. The invention realizes the matching between the spectral characteristics of light sources and detectors and the characteristic absorption band of measured gas. Moreover, the gas concentration measurement system relies on the sampling of the circulating gas flow in the circulation cavity of the gas suction chamber to detect gas concentration, and thereby the real-time collection and measurement of environmental gas are ensured.
Description
Technical field
The present invention relates to gas concentration measurement technical field, and in particular to a kind of active cycle air suction type device it is infrared many
Light path gas concentration measurement optical system.
Background technology
It is the gas concentration measurement system of light source to use infraluminescence pipe, needs to consider as follows in the design of optical system
Five kinds of influences disturbed to measuring.
(1) influence of temperature.The emissive porwer and peak emission wavelength of luminous tube are varied with temperature, in moderate ring
In the temperature range of border, the displacement of wavelength is simultaneously little (﹤ 3nm/ DEG C), but the change of emissive porwer is apparent.Additionally, in infrared gas
Conventional vulcanized lead or lead selenide detector are synthermal in itself in bulk measurement very big correlation, ＞ as this Relativity
1%/DEG C.
(2) signal fluctuation produced by luminous tube output-power fluctuation and detector responsivity change.Infrared-gas concentration
Measuring system must be compensated for drawing due to luminous tube output-power fluctuation and detector responsivity change in long continuous operation
The signal fluctuation for rising.Due to device heating, so the output of luminous tube is substantially directly proportional to electric current, and with current impulse
Width and repetition rate and change.
(3) spectral characteristic.Infraluminescence pipe spectral half width (FWHM) be in 0.13um (peak wavelength is 2.0um) extremely
In the range of 0.64um (peak wavelength is being 4.4um), such bandwidth has exceeded the Absorption Characteristics bandwidth of many gases.As knot
Really, the radiation intensity through gas be at strong absorbing wavelength with Weak Absorption wavelength at radiation intensity sum.Produced
Therefore signal is watered down, and deviate from Lambert-Beer laws.
(4) change of the air chamber transmissivity caused by the abrasion of dust and optical element.Measuring system long-term work exists
In air ambient, although can use appropriate dust prevention, can also some fine solid particle enter air inlet chamber, and meeting
Being deposited on influences transmittance on window.Other periodic cleaning air chamber, will also result in the abrasion of optics, influence the printing opacity of air chamber
Ability.So in the design of optical system, it is necessary to consider the air chamber transmissivity caused by the abrasion of dust and optical element
Change to measure influence.
(5) mismatch problems of detector.Selected detector is depended on using the system of two or more detectors
The matched well of various characteristics.The mismatch of detector can cause the drift of signal, bring measurement error.For example, with a collection of production
PbSe detectors temperature coefficient differences may be more than 5%.So when selecting, it is necessary to tested and matched.In light
Adequate measures can also be taken in the design of system, the influence that detector mismatch is brought to measurement is eliminated.
(6) detector inside is corresponded topic with environment real-time streams.For the detection of gas concentration, tradition relies primarily on gas certainly
By diffusion and active inspiration two ways；Free diffusing, including gas mixing process free diffusing and buoyancy factor.This side
Formula is relatively adapted to for fixed space or container, slow due to free diffusing if the space in change, it is easy to
Cause the difference of metering and actual environment.And active inspiration can reduce this error relatively.
Traditional active inspiration mainly outside gas concentration measurement system add asepwirator pump by way of, mixed gas
Decimated next, gasmetry pectoralgia is in the air-flow of mixed gas.But gas concentration measurement internal system work according to
What is so relied on is free diffusing mode.These all do not accomplish the real-time of concentration measurement.
From analysis above, it is necessary to consider device temperature, light in the Optical System Design using infraluminescence pipe
This several respect that source output-power fluctuation, detector responsivity change, detector mismatch, dust and light tool are stained and gas circulates
Influence to certainty of measurement.For these problems, traditional design is to seek doing for solution as much as possible in terms of different
Method, wherein typically there is following four scheme：
Scheme one：The program be by the temperature control of air chamber at a constant temperature.So, gas on the one hand can be avoided red
Outer absorptivity variation with temperature；On the other hand so that infrared light-emitting device and receiving device are not influenced by temperature.In addition,
In the moist gas of monitoring, air chamber is heated to dew point above is a kind of adequate measures.
Scheme two：The program corrects the letter caused by temperature by monitoring the temperature of air chamber, luminous tube and detector
Number change.The correction of temperature by tabling look-up or polynomial form is calibrated, and can be stored in read-only storage.
The measure that above two scheme is provided to the influence of compensation temperature and uses.
Scheme three：The program increases by a detector directly against luminous tube, referred to as reference detector.To be detected from reference
The signal of device and the signal of measurement detector are compared, it is possible to realize to light source output power fluctuation and detector responsivity
The compensation of change.Used as greater compactness of instrument, reference detector and luminous tube can be packaged together, and size can accomplish same
Individual transistor is big like that.As a result of two detectors, so there is detector mismatch in this scheme.Simultaneously because of reference
Detector is in source ends, therefore the change of the air chamber transmissivity caused by dust or optical element abrasion is not resolved.
Scheme four：In order to make up the deficiency of scheme three and the Incomplete matching of pipe spectral characteristic, the program is filtered using interference
The good monochromatic nature of mating plate, before two panels spike interference filter is respectively placed in into reference detector and measurement detector, its
In a piece of wavelength be located in tested gas and mixed gas, the main non-absorbent wave band of interfering component, referred to as reference optical filter,
Form reference light paths；The wavelength of another is located at tested gas characteristic absorption spectrum section, referred to as measures optical filter, forms measurement light
Road.Reference light paths and analysis light path work under same environment, and the potential difference for taking both is compared, and avoids because of ring
The drift that border changes and light source luminescent power and detector responsivity change cause.But the single light source double detector design
Still there is a problem of detector mismatch.
It can be seen that this several scheme all more or less realizes the compensation to this several external disturbance, but there is also one
It is a little not enough.
The content of the invention
To solve problem above, it is an object of the invention to provide a kind of active cycle getter device, infrared multi-pass gas
Bulk concentration measures optical system.
The purpose of the present invention is realized by following technical proposals.
A kind of infrared multi-pass gas concentration measuring apparatus of active cycle air suction type, including multi cycle induction chamber and infrared many
Path optical system；
The multi cycle induction chamber includes the asepwirator pump and inhale that the air admission hole that is located on induction chamber is connected with air admission hole
The corresponding air flow chamber of air pump, venthole is provided with the end induction chamber of air flow chamber, and filtering dress is communicated with the side of air flow chamber
Put；
The infrared multi-pass optical system includes the torus being connected with filter, is symmetrically arranged with torus
Infrared multi-pass gasmetry mechanism, is provided with circulation stomata in torus, and circulation stomata is communicated to air admission hole.
Further, the infrared multi-pass gasmetry mechanism is distributed with two groups in torus cavity, is respectively two
Infraluminescence pipe, four infrared detectors, two groups of lens and reflective mirrors, two infraluminescence pipes, four infrared detectors
The opposite interlaced arrangement of difference；Infraluminescence pipe is located on circulation chamber wall, optical filter is carried on infrared detector, with infrared hair
Light pipe is located on same circulation chamber wall, and transmissive mirror is located on the corresponding surface of infraluminescence pipe locular wall, is set in the middle part of transmissive mirror
There is the reflective mirror for being coated with plated film.
Further, the infraluminescence pipe uses diameter in the incandescent lamp of 3.17mm as light source, belongs to heat radiation type light
Source, wavelength is 2-20 μm, is adapted to the measurement of CO4.65 μm and 3.91 μm of reference light source.
Further, the optical filter is different optical filters, respectively centre wavelength be 4.65 μm, half-band width be 180nm
Signal optical filter, or centered on wavelength be 3.91 μm, half-band width be 90nm reference optical filter.
Further, the multi cycle induction chamber be open type, infrared multi-pass optical system be to penetrate with it is reflective；Simultaneously
Minute surface coagulates the pollution such as mist, dust and the result for measuring is not influenceed, and light path and air chamber more reliably work.
Further, the filter includes deflector, and the filter layer of setting corresponding with deflector divides in filter layer
The filter material of different densities is not provided with, wherein filter material density of the filter material density less than gas outlet in air inlet.
Alternately lighted in a pulsed fashion by two luminous tubes in this circulating air chamber cavity, by two groups of lens and reflective mirror
Composition optical facilities so that four detectors are each alternately produced two signals, totally eight signals.Opposed by two groups of four signals
Than obtaining a gas concentration and transmittance, the function that room is long, chamber cross-section product is relevant.Room is long and chamber cross-section is accumulated and fixed,
Gas extract only has relation with gas concentration.
Wherein asepwirator pump is between sample gas air admission hole and circulation stomata, causes negative pressure at circulation stomata, circulating air chamber
Flowed from trend circulating air hole the automatic higher-pressure region by sample gas air admission hole of gas.
This design not only compensate for by the influence that temperature change is brought, and also compensates for due to luminous tube output work
Signal fluctuation, the mismatch of detector, the abrasion by dust or optical element that the change of rate, the change of detector responsivity are produced
And the influence that the change of the air chamber transmittance for causing brings, realize light source and detector spectrum characteristic and inhaled with tested gas characteristic
The matching of take-up；Dynamic is in by circulating current simultaneously, it is ensured that the constantly property of testing result.
The beneficial effects of the invention are as follows：
1st, the present invention devises one kind by active inspiration formula multi-pass infrared-gas measurement of concetration optical system structure；Wherein
The gas concentration measurement optical system of dual light source four detector composition, not only compensate for by the influence that temperature change is brought,
And also compensates for change due to luminous tube power output, signal fluctuation, the detector that the change of detector responsivity is produced
Mismatch, the influence that brings of the change of air chamber transmittance that is caused by the abrasion of dust or optical element, realize light source and
Detector spectrum characteristic is matched with tested gas characteristic absorption band.Gas concentration measurement system relies on induction chamber torus simultaneously
Interior circulating current sampling detection gas concentration, it is ensured that environmental gas are constantly gathered with metering, and due to asepwirator pump air admission hole
The negative pressure of generation, enlargement gas measurement of concetration acquisition range allows gas concentration measurement systematic difference scope to be expanded to height
Up to fields such as spaces.
Brief description of the drawings
Fig. 1 is measurement apparatus structural representation of the present invention；
Fig. 2 is multi-pass gasmetry mechanism structure schematic diagram.
In figure：1st, air admission hole；2nd, asepwirator pump；3rd, air flow chamber；4th, venthole；5th, filter；6th, sample gas air admission hole；7、
Torus；8th, multi-pass gasmetry mechanism；01st, infraluminescence pipe I；801st, infrared detector I；802nd, infrared detector
Ⅱ；02nd, infraluminescence pipe II；803rd, infrared detector III；804th, infrared detector IV；811st, optical filter I；812nd, filter
Piece II；813rd, optical filter III；814th, optical filter IV；815th, transmissive mirror I；816th, reflective mirror I；817th, transmissive mirror II；818th, it is reflective
Mirror II；9th, stomata is circulated.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawings and examples, but is not intended as doing any limit to invention
The foundation of system.
As shown in figure 1, a kind of infrared multi-pass gas concentration measuring apparatus of active cycle air suction type, including multi cycle air-breathing
Room and infrared multi-pass optical system.Wherein：
Multi cycle induction chamber includes the asepwirator pump 2 and air-breathing that the air admission hole 1 that is located on induction chamber is connected with air admission hole 1
The corresponding air flow chamber 3 of pump 2, venthole 4 is provided with the end induction chamber of air flow chamber 3, and filtering is communicated with the side of air flow chamber 3
Device 5.Infrared multi-pass optical system includes the torus 7 being connected with filter 3, is symmetrically arranged with torus 7 red
Outer multi-pass gasmetry mechanism 8, is provided with circulation stomata 9 in torus 7, and circulation stomata is communicated to air admission hole 1.Filter
5 include deflector, and the passage corresponding to deflector is sample gas air admission hole 6；The filter layer of setting corresponding with deflector, in filtering
The filter material of different densities is respectively equipped with layer, wherein filter material density of the filter material density less than gas outlet in air inlet.
Multi-pass infrared optical device is distributed in torus, and system is by the circulating current sampling in induction chamber torus
Detection gas concentration, it is ensured that environmental gas are constantly gathered with metering, simultaneously because the negative pressure that asepwirator pump air admission hole is produced, expands and survey
Amount system acquisition scope, allows the range of application of measuring system to be expanded to the up to field such as space.
As shown in Fig. 2 multi-pass gasmetry mechanism 8 is distributed with two groups in torus cavity, it is respectively two infrared
I 01 and II 02, four infrared detectors I 801, II 802, III 803, IV 804 of luminous tube, two groups of transmissive mirrors I 815 and II 817
And reflective mirror I 816 and II 818, two groups of opposite interlaced arrangements of difference；Infraluminescence pipe I 01 is located on circulation chamber wall, and four red
Optical filter I 811, II 812, III 813, IV 814 is respectively provided with outer photo-detector, same torus is located at infraluminescence pipe
On locular wall, transmissive mirror is located on the corresponding surface of infraluminescence pipe locular wall, and the reflective mirror for being coated with plated film is provided with the middle part of transmissive mirror.
Multi-pass optical system include two 2-20um infraluminescence pipes, two integrated 3.90um and be 4.65um filter
Piece, total reflection reflector and Infrared Detectors optics are (if C0 will be detected2And CH4The optical filter and detector of 4.65um
Changing 4.24um or 3.3um into just can be with, while if measuring multiple gases, can be the optical filter of multi-wavelength and infrared acquisition
Device is integrated together.) two luminous tubes alternately light in a pulsed fashion, this four detectors are each alternately produced two signals,
Totally eight signals.Compared by two groups of four signals, obtain that a gas concentration is only long with transmittance, room, chamber cross-section product has
The function of pass.Room is long and chamber cross-section is accumulated and fixed, and gas extract only has relation with gas concentration.
This design not only compensate for by the influence that temperature change is brought, and also compensates for due to luminous tube output work
Signal fluctuation, the mismatch of detector, the abrasion by dust or optical element that the change of rate, the change of detector responsivity are produced
And the influence that the change of the air chamber transmittance for causing brings, realize light source and detector spectrum characteristic and inhaled with tested gas characteristic
The matching of take-up.
The device that multi-pass gasmetry mechanism of the present invention uses is illustrated separately below.
1st, infrared light supply
Because the infrared absorption peak of carbon monoxide is at 4.65 μm or so places, atmospheric window wavelength in 3.90um or so, so
In order to ensure that light source has stronger light intensity in the range of this, we select a kind of diameter in the incandescent lamp conduct of 3.17mm or so
Light source, belongs to heat radiation type light source, and wavelength is adapted to the measurement of CO4.65 μm and 3.91 μm of reference light source from visible ray to 20 μm.
Infrared light supply has following features
1. output spectral line expands to 20 μm of middle infrared or so；
2. high reliability；
3. the output of stabilization；
4. short-time constant τ=12ms；
5. long-life, up to 40000 hours when being operated in 5 volts of power supplys.
2nd, optical filter
Here dual wavelength double light path scheme is used, light source uses infrared light supply, so appropriate optical filter should be designed.
After detection air chamber, before detector, filtered using two pieces of different optical filters of centre wavelength.The centre wavelength one of optical filter
As select to absorb very weak or do not absorb place's (reference wavelength) while to avoid other in carbon monoxide absworption peak and in carbon monoxide
The absorption of gas molecule.
Our the CO gas absorption bands in using near infrared 4.65 μm, send out according to selected incandescent lamp
Light characteristic, selects the performance parameter of interferometric filter as follows here
Signal optical filter：Centre wavelength is 4.65, and half-band width is 180nm.
It is 3.91um with reference to filter center wavelength, half-band width is 90nm.
3rd, infrared sensor
Pyroelectric detector is made according to pyroelectric effect.When on Infrared irradiation to object, body surface is fast
The temperature change of speed changes crystal spontaneous polarization strength, and surface charge changes, here it is pyroelectric effect.Pyroelectricity is visited
Surveying device need not typically freeze, it is easy to which operation and maintenance, good reliability, spectral response are unrelated with wavelength, be non-selectivity detection
Device, preparation technology is relatively easy, and cost is relatively low.The major advantage of infrared thermal release electric detector is in response to wide waveband, can be in room
The lower work of temperature, it is easy to use.
It is rapid based on the infra-red radiation change used by the present invention, reaction speed will be sought quickness, we select a binary channels
Offset-type pyroelectric detector.
Sensor performance is as follows：
Time constant：τ=12ms；Response：150,000V/W；Response wave length：4.65 (180) μm and 3.91 (90) μm.
4th, asepwirator pump parameter
Size：40*40*28mm；Operating voltage：12VDC(7-13.2VDC)；Rotating speed：15000R.P.M (REF) wind speed：
0.76m3/min。
Operation principle of the invention
1st, the operation principle of multi-pass infrared-gas concentration detection system
Cardinal principle of the present invention is directed to a kind of gases of CO, the multi-pass infrared-gas constituted using dual light source four detector
Measurement of concetration optical system structure, structure diagram is as shown in Figure 2.If λ1To be tested the characteristic wavelength of gas, wavelength is referred to as measured；
λ2It is the non-absorbent wavelength of main interfering component, referred to as reference wavelength in tested gas and mixed gas.In infrared detector I
801 and infrared detector III 803 before place wavelength be λ1Optical filter so that be irradiated to the two infrared detectors
On infra-red radiation be only λ1Radiation；λ was placed before infrared detector II 802 and infrared detector IV 8042's
Optical filter so that be irradiated to the infra-red radiation only λ on the two infrared detectors2Radiation.Two infraluminescence pipes are handed over
Alternately launch in a pulsed fashion, this causes that each infrared detector is alternately produced two signals, totally eight signals.This eight
Signal depends on radiation intensity I, the responsiveness R of infrared detector, the transmittance τ of tested gas of infraluminescence pipeaAnd
The transmittance τ of air chamber0。
If the radiation intensity of infraluminescence pipe I 01 and infraluminescence pipe II 02 is respectively I1And I2, infrared detector I
801st, the responsiveness of infrared detector II 802, infrared detector III 803 and infrared detector IV 804 is respectively R1, R2,
R3, R4.When driving infraluminescence pipe I 01 to send pulsed light, infrared detector I 801 and infrared detector II 802 are received
To the radiation for being directly from infraluminescence pipe I 01, infrared detector III 803 and infrared detector IV 804 are received
Be infra-red radiation through air chamber.Because tested gas is to λ2Infra-red radiation do not absorb, so infrared detector IV 804
The transmittance exported only with chamber is relevant.Tested gas is to λ1Infra-red radiation have stronger absorption, so infrared detector
Transmittance of III 803 output not only with air chamber is relevant, also relevant with the transmittance for absorbing gas.Infrared detector I 801,
The voltage of infrared detector II 802, infrared detector III 803 and infrared detector IV 804 output is respectively
When driving infraluminescence pipe II 02 to send pulsed light, infrared detector III 803 and infrared detector IV 804
What is received is directly from the radiation of infraluminescence pipe II 02, and infrared detector I 801 and infrared detector II 802 connect
What is received is the infra-red radiation through air chamber.It is identical with above-mentioned principle, infrared detector I 801, infrared detector II 802,
Infrared detector III 803 and the voltage of the output of infrared detector IV 804 are respectively
Marriage relation formula
Thus produce one it is unrelated with infrared detector responsiveness and infraluminescence pipe radiation intensity and withInto
The signal of direct ratio.τaThere is following relation with air chamber length and tested gas concentration
τa=e-kcl (4)
In formula, k is the absorption cross-section for absorbing gas；C is tested gas concentration；L is air chamber length.ThenCan be expressed as
K、e、τaIt is definite value with l.
In the design of infrared-gas concentration detection system of the present invention, can be by above-mentioned Optical System Design into reflective, gas
Room is designed to open type.Eliminate simultaneously the solidifying mist of minute surface to measure influence, prevent pollution of the dust to air chamber, make light path and air chamber
More reliably work.
2nd, the circuit design of asepwirator pump ----multi cycle formula induction chamber
The outlet of stomata 9 is circulated in multi cycle formula induction chamber of the present invention and is located at the position of air admission hole 1, asepwirator pump 2 enters in sample gas
Between stomata 6 and circulation stomata 9, because the power of asepwirator pump 2 causes the higher-pressure region in negative pressuren zone and wall at air admission hole 1,
Cause gas actively from the flow direction circulation stomata 9 of sample gas air admission hole 6；So, optical measuring system can circulate the tested gas of measurement,
While ensureing that gas constantly circulates with environment in measurement cavity, optical system light flash gap is made up, because air-flow is too fast,
Loss launch opportunity, it is ensured that the accuracy of monitoring.
The invention is not limited in above-described embodiment, on the basis of technical scheme disclosed by the invention, the skill of this area
Art personnel are according to disclosed technology contents, it is not necessary to which performing creative labour just can make one to some of which technical characteristic
A little to replace and deform, these are replaced and deform within the scope of the present invention.
Claims (7)
1. infrared multi-pass gas concentration measuring apparatus of a kind of active cycle air suction type, it is characterised in that including multi cycle air-breathing
Room and infrared multi-pass optical system；
The multi cycle induction chamber includes the asepwirator pump and asepwirator pump that the air admission hole being located on induction chamber is connected with air admission hole
Corresponding air flow chamber, venthole is provided with the end induction chamber of air flow chamber, and filter is communicated with the side of air flow chamber；
The infrared multi-pass optical system includes the torus being connected with filter, is symmetrically arranged with torus infrared
Multi-pass gasmetry mechanism, is provided with circulation stomata in torus, and circulation stomata is communicated to air admission hole.
2. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 1, it is characterised in that
The infrared multi-pass gasmetry mechanism is distributed with two groups in torus cavity, be respectively two infraluminescence pipes, four
Infrared detector, two groups of lens and reflective mirror, two infraluminescence pipes, four opposite staggeredly cloth of infrared detectors difference
Put；Infraluminescence pipe is located on circulation chamber wall, and optical filter is carried on infrared detector, is located at infraluminescence pipe same
On circulation chamber wall, transmissive mirror is located on the corresponding surface of infraluminescence pipe locular wall, is provided with the middle part of transmissive mirror and is coated with the anti-of plated film
Light microscopic.
3. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 2, it is characterised in that
The infraluminescence pipe uses diameter in the incandescent lamp of 3.17mm as light source, belongs to heat radiation type light source, and wavelength is 2-20 μm,
It is adapted to the measurement of CO4.65 μm and 3.91 μm of reference light source.
4. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 2, it is characterised in that
The optical filter is different optical filters, respectively centre wavelength be 4.65 μm, half-band width be the signal optical filter of 180nm, or
Centered on wavelength be 3.91 μm, half-band width be 90nm reference optical filter.
5. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 2, it is characterised in that
The infrared detector is two-channel compensation type pyroelectric detector.
6. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 1, it is characterised in that
The multi cycle induction chamber be open type, infrared multi-pass optical system be to penetrate with it is reflective；Minute surface coagulates mist and dust simultaneously
Pollute does not influence on the result for measuring.
7. infrared multi-pass gas concentration measuring apparatus of active cycle air suction type according to claim 1, it is characterised in that
The filter includes deflector, and the filter layer of setting corresponding with deflector is respectively equipped with different densities in filter layer
Filter material, wherein the filter material density of filter material density in air inlet less than gas outlet.
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