CN108827906A - A kind of near infrared spectrum multicomponent gas on-line detecting system and method - Google Patents
A kind of near infrared spectrum multicomponent gas on-line detecting system and method Download PDFInfo
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- CN108827906A CN108827906A CN201810357321.5A CN201810357321A CN108827906A CN 108827906 A CN108827906 A CN 108827906A CN 201810357321 A CN201810357321 A CN 201810357321A CN 108827906 A CN108827906 A CN 108827906A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000004973 liquid crystal related substance Substances 0.000 claims description 4
- 239000003550 marker Substances 0.000 claims description 4
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- 210000004027 cell Anatomy 0.000 claims 1
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- 238000004880 explosion Methods 0.000 abstract description 10
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 abstract description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 4
- 239000001294 propane Substances 0.000 abstract description 2
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- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 229910052934 alunite Inorganic materials 0.000 description 1
- 239000010424 alunite Substances 0.000 description 1
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- KPZTWMNLAFDTGF-UHFFFAOYSA-D trialuminum;potassium;hexahydroxide;disulfate Chemical compound [OH-].[OH-].[OH-].[OH-].[OH-].[OH-].[Al+3].[Al+3].[Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O KPZTWMNLAFDTGF-UHFFFAOYSA-D 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- 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
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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 discloses a kind of near infrared spectrum multicomponent gas on-line detecting system and methods, using near-infrared wide band detection light source, and long-range optical system are combined to realize that dangerization region multicomponent gas leaks on-line checking.This method carries out wavelength convert using multi-wavelength optical chopper wheel, realize that multicomponent gas detects simultaneously, influence of the light intensity fluctuation to detection is eliminated by double UV check, realizes that gas concentration on-line calibration and multicomponent gas explosion hazard detect using built-in calibration pool combination double light path and double UV check.This method and system can satisfy the flammable gas explosions risk safety detection such as industrial environment CO, methane, propane and apply needs.
Description
Technical field
The invention belongs to field of gas detection, and in particular to a kind of near infrared spectrum multicomponent gas on-line detecting system and
Method.
Background technique
Inevitably there are various inflammable, explosion hazard gases ingredients in petrochemical industry process, these gases once leak and product
Gather in ambient enviroment, the hidden danger of the serious accidents such as burning, explosion will be become, in order to prevent trouble before it happens, needing can using performance
The gas detection alarm monitoring device leaned on tightly monitors the gas concentration in process unit or storage and handling facility environment, with true
Ensure safety production.Conventional electrochemical and the easy poisoning of catalytic combustion-type point sensor presence, the service life is short, monitoring range is small, and
Non-faulting is from becoming the deficiencies of safe, it is difficult to meet the needs of long-term petrochemical industry regional explosion gas, reliable monitoring and early warning.
In addition, point type instrument can not provide the regional safety monitoring being completely covered and accident early warning in time.Optical detecting method has
Region security may be implemented by combining with long light path technology in outstanding advantages of non-cpntact measurement, high sensitivity, the service life is long
Monitoring is completely covered, and is an important directions of current industry security monitoring technology development.In recent years, with infrared and sharp
The fast development of light technology, the spectrum detection technique based on gas infrared absorption has become environment and industrial process gas is a kind of
Effective detection means, the infrared semiconductor laser spectral detection skill especially with optical communication semiconductor laser as light source
Art, the highly sensitive, high-resolution having and long light path detection feature, make it have pole in industrial process gas on-line checking field
Big attraction.
Multicomponent gas on-line checking may be implemented using the infrared spectrum technology of wideband light source, be based particularly on target gas
The mid-infrared light spectral technology that body molecule fundamental frequency absorbs, the high advantage of detection sensitivity with higher.But due to gas molecule base
Frequency absorption band spectral line is intensive, and the absorption band of different molecular is overlapping, it is difficult to completely eliminate the cross jamming between component, and due to tool
There is stronger Absorption Line strong, it is short effectively to detect light path, it is difficult to meet explosion limit under high concentration environment and detect using needs.
Summary of the invention
The present invention proposes a kind of near infrared spectrum for the monitoring of dangerization region multicomponent combustible gas leakage explosion safety
Multicomponent gas on-line detecting system and method using near-infrared wide band detection light source, and combine long-range optical system to realize danger
Change region multicomponent gas and leaks on-line checking.The present invention carries out wavelength convert using multi-wavelength optical chopper wheel, realizes multiple groups
Divide gas to detect simultaneously, influence of the light intensity fluctuation to detection is eliminated by double UV check, built-in calibration pool is utilized to combine double light
Road and double UV check realize that gas concentration on-line calibration and multicomponent gas explosion hazard detect.The present invention can satisfy work
The application of the flammable gas explosions risk safety detection such as industry environment CO, methane, propane needs.
The technical solution adopted by the present invention is that：
A kind of near infrared spectrum multicomponent gas on-line detecting system, it is characterised in that：It include host and external detection
Light path system, external detection light path system include transmitting-receiving optic probe, corner reflector；
The transmitting-receiving optic probe includes xenon flash lamp, cable interface one, is set gradually in the front optical path of xenon flash lamp
Have collimation a camera lens, optically filtering disk, beam splitter one, the transmitted light path of beam splitter one is equipped with beam splitter two, beam splitter two it is saturating
It penetrates in optical path and is successively arranged Fresnel Lenses, quartz window sheet, corner reflector, calibration is successively arranged on the reflected light path of beam splitter one
The reflected light path of absorption cell, infrared photoelectric detector two, beam splitter two is equipped with infrared photoelectric detector one；The beam splitter
One, beam splitter two, Fresnel Lenses, quartz window sheet, corner reflector, infrared photoelectric detector one constitute light path；Described point
Shu Jingyi, steam correcting absorptive pool, infrared photoelectric detector two constitute calibration optical path, filled with including known concentration n in steam correcting absorptive pool
The calibrating gas of kind one atmospheric pressure of system detection gas；The driving of the cable interface one and xenon flash lamp, optically filtering disk
Mechanism, infrared photoelectric detector one, infrared photoelectric detector two connect；
The host includes mainframe box, and host tank wall is equipped with cable interface two, AC Power supply socket, is equipped in mainframe box
Light source pulse power supply, optically filtering disk the control power supply, low-pass filtering amplifying circuit one, low pass being connect respectively with cable interface two
Filter amplification circuit two, low-pass filtering amplifying circuit one, the signal output end of low-pass filtering amplifying circuit two and signal acquisition and
Processing module connection, the signal output end of Signal acquiring and processing module and light source pulse power supply, optically filtering disk control power supply,
Liquid crystal display connects, and D.C. regulated power supply is connected on AC Power supply socket, and D.C. regulated power supply is each for remaining in mainframe box
Module for power supply；
The cable interface one, two-way cross multicore cable connection, detection signal that infrared photoelectric detector one, two measures,
Reference signal is respectively connected to low-pass filtering amplifying circuit one, two.
A kind of near infrared spectrum multicomponent gas on-line detecting system, it is characterised in that：The optically filtering disk
Edge is uniformly provided with 2 × n light hole, and the optical filter for different logical optical wavelengths is equipped on light hole, detects for i-th kind
Gas, a corresponding Detection wavelength optical filter and a reference wavelength optical filter, Detection wavelength optical filter logical optical wavelength corresponding i-th
The absorption bands of kind detection gas, reference wavelength optical filter logical optical wavelength is corresponding to inhale without i-th kind of detection gas and interference gas
The wave band of receipts.
A kind of near infrared spectrum multicomponent gas on-line detecting system, it is characterised in that：The optically filtering disk
Edge is equipped with witness marker, detects for optical modulation plate turned position.
A kind of near infrared spectrum multicomponent gas online test method, it is characterised in that：For the n kind gas of system detection
The data processing method of body, any i-th kind of gas concentration detection is as follows：
(1) start detection system, optical modulation plate it is every rotation one week, while obtain a cycle detection signal and one
The calibration signal in period, the detection signal and a cycle calibration signal of a cycle are made of 2 × n pulse train；One
The 2 × i-1 pulse pair of the detection signal pulse sequence in a period answers the absorption signal of i-th kind of detection gas of light path,
The 2 × i pulse pair answers the reference signal of i-th kind of detection gas of light path；The 2nd of a cycle calibration signal pulse train
× i-1 pulse pair should calibrate the absorption signal of i-th kind of detection gas of optical path, and the 2 × i pulse pair answers i-th kind of light path
The reference signal of detection gas；
(2) after Signal sampling and processing module carries out data acquisition and multiple cumulative mean to detection signal and calibration signal
Obtain a cycle analysis detection signal data M and a cycle analysis calibration signal data N；A cycle analysis inspection
The 2 × i-1 pulse data for surveying signal M is used as the detection absorption signal M of i-th kind of detection gas of light pathi, a cycle
Analysis is used as the detection reference signal M of i-th kind of detection gas of light path with the 2 × i pulse data of detection signal Mib；One
The calibration that the 2 × i-1 pulse pair of a cycle analysis calibration signal data N should calibrate i-th kind of detection gas of optical path absorbs
Signal Ni, a cycle, which is analyzed, answers the schools of i-th kind of detection gas of light path with the 2 × i pulse pair of calibration signal data N
Quasi- reference signal Nib；In known calibration absorption cell filled with i-th kind of system detection gas concentration be Ci；
(3) to the detection absorption signal M of i-th kind of detection gasiNumerical integration is carried out, the inspection of i-th kind of detection gas is obtained
Absorption signal intensity is surveyed, MA is defined asi；To the detection reference signal M of i-th kind of detection gasibNumerical integration is carried out, obtains i-th
The detection reference signal strength of kind detection gas, is defined as MBi；To the calibration absorption signal N of i-th kind of detection gasiCarry out numerical value
Integral, obtains the calibration absorption signal N of i-th kind of detection gasiIntensity is defined as NAi；Calibration reference to i-th kind of detection gas
Signal NibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity is defined as NBi；
Define AiTo detect absorption signal intensity MAiWith detection reference signal strength MBiRatio, BiLetter is absorbed for calibration
Number intensity NAiWith calibration reference signal intensity NBiRatio, have：
Defining i-th kind of system detection gas concentration in light path is Xi, then have：
Wherein, YiFor system parameter.
A kind of near infrared spectrum multicomponent gas online test method, it is characterised in that：The system parameter Yi
Measuring method it is as follows：
An atmospheric pressure high pure nitrogen will be filled in steam correcting absorptive pool, to the calibration absorption signal N of i-th kind of detection gasi
Numerical integration is carried out, the blank calibration absorption signal M of i-th kind of detection gas is obtainediIntensity is defined as NAi0；I-th kind is detected
The calibration reference signal N of gasibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity, definition
For NBi0；
Compared with the prior art, the present invention has the beneficial effect that：
(1) present invention uses bifocal path structure and double UV check, and built-in calibration pool is combined to realize multicomponent gas
On-line calibration eliminates the influence that light source intensity rises and falls to detection, improves the precision of gasmetry.
(2) present invention uses high brightness pulse near-infrared wideband light source, carries out wavelength using multi-wavelength optical chopper wheel and turns
It changes, influence of the light intensity fluctuation to detection caused by light path delustring changes is eliminated by double UV check, realizes long light path
Multicomponent gas detects simultaneously, improves detection light path, meets the monitoring of dangerization region multicomponent combustible gas leakage explosion safety
Application need.
Detailed description of the invention：
Fig. 1 show near infrared spectrum multicomponent gas on-line detecting system structural schematic diagram of the invention
Fig. 2 show multi-wavelength optical reticle configuration schematic diagram of the invention
Specific embodiment：
Referring to Fig. 1, Fig. 2.
Label in Fig. 1：1, mainframe box, 2, transmitting-receiving optic probe cover, 3, xenon flash lamp, 4, collimation camera lens, 5, optically filtering
Disk, 6, steam correcting absorptive pool, 7, beam splitter one, 8, beam splitter two, 9, Fresnel Lenses, 10, quartz window sheet, 11, corner reflector,
12, infrared photoelectric detector one, 13, infrared photoelectric detector two, 14, cable interface one, 15, multicore cable, 16, cable interface
Two, 17, light source pulse power supply, 18, optically filtering disk control power supply, 19, low-pass filtering amplifying circuit one, 20, low-pass filtering puts
Big circuit two, 21, Signal sampling and processing module, 22, liquid crystal display, 23, D.C. regulated power supply, 24, AC Power supply socket.
Above-mentioned component 15-24 constitutes instrument host, light source pulse power supply 17, optically filtering disk control power supply 18, low-pass filtering amplification electricity
Road 1, low-pass filtering amplifying circuit 2 20, Signal sampling and processing module 21, liquid crystal display 22 are by D.C. regulated power supply
23 power supplies.Above-mentioned component 2-10,12-14 constitute transmitting-receiving optic probe, and transmitting-receiving optic probe and corner reflector 11 are constituted outside instrument
Portion's light path system.Host is connect with transmitting-receiving optic probe by multicore cable 15.
For this system n kind target detection gas, 5 edge of optically filtering disk is uniformly provided with 2 × n light hole, pacifies above
Equipped with the optical filter for being directed to different logical optical wavelengths, for i-th kind of detection gas, a corresponding Detection wavelength optical filter 5-i and one
A reference wavelength optical filter 5-ii, the absorption bands of the corresponding i-th kind of detection gas of Detection wavelength optical filter 5-i logical optical wavelength, ginseng
Examine the corresponding wave band absorbed without i-th kind of detection gas and interference gas of wavelength filter 5-ii logical optical wavelength.Optically filtering disk 5
It is detected added with witness marker 5-0 for 5 turned position of optical modulation plate at edge.Beam splitter 1, beam splitter 28, Fresnel is saturating
Mirror 9, quartz window sheet 10, corner reflector 11, infrared photoelectric detector 1 constitute light path together；Beam splitter 1, calibration are inhaled
Receives pond 6, infrared photoelectric detector 2 13 constitute calibration optical path, filled with including known concentration n kind system detection in steam correcting absorptive pool 6
The calibrating gas of one atmospheric pressure of gas.
The working principle of the invention is：
Near infrared spectrum multicomponent gas on-line detecting system proposed by the present invention is using an xenon flash lamp 3 as close red
External spectrum detects wideband light source, and xenon flash lamp 3 exports pulsed light under the driving of light source pulse power supply 17, and xenon lamp pulsed light is collimated
Become to collimate light output after camera lens, broadband collimated light becomes logical with optical filter after light hole filter plate on optical modulation plate 5
The corresponding narrowband collimated light of optical wavelength, the uniform rotation in the case where optically filtering disk control power supply 18 drives of optical modulation plate 5, so that wide
With collimated light sequence by 2 × n optical filter on optical modulation plate 5, sequence obtains the narrowband collimation of 2 × n kind different wave length
Light.Light source pulse power supply 17 and optically filtering disk control power supply 18 are controlled by Signal sampling and processing module, so that optics
On 2 × n optical filter order rotation to xenon lamp pulse optical transport optical path on chopper wheel 5, and guarantee that each optical filter reaches
There is a complete pulsed light light to pass through when xenon lamp pulse optical transport optical path, so that light path and calibration optical path difference sequence
Obtain the narrowband collimated light of 2 × n kind different wave length.Using 5 edge of optically filtering disk added with witness marker 5-0, available light
Learn the signal that filtering disk 5 rotates one week.Narrow-band impulse light after optical modulation plate 5 is divided into two after beam splitter 1
Beam, it is a branch of as calibration light to reach infrared photoelectric detector 2 13 after steam correcting absorptive pool 6,2 13 pairs of infrared photoelectric detector
Pulsed light carries out photoelectric conversion and obtains calibration signal；Another Shu Zuowei detection light is transmitted through beam splitter 28, and saturating by Fresnel
9 center of mirror and quartz window sheet 10 are emitted, and the detection light of outgoing reaches corner reflector 11 behind region after testing, and corner reflector 11 will
The reflection of detection light Hongyuan optical path, and detection zone is again passed by, the detection light in area is through quartz window sheet 10 and by luxuriant and rich with fragrance alunite after testing
You collect lens 9, and focus on photodetector 1 through the reflection of beam splitter 28, and one 12 pairs of photodetector reflect simultaneously
The detection light of focusing carries out photoelectric conversion and obtains detection signal.Signal is detected through cable interface 1, multicore cable 15, cable connects
Mouth 2 16 reaches the low-pass filtering amplifying circuit 1 in mainframe boxes, and reference signal is through cable interface 1, multicore cable 15, electricity
Cable interface 2 16 reaches low-pass filtering amplifying circuit 2 20, and low-pass filtering amplifying circuit 1 is respectively to detection signal and low pass filtered
Wave amplifying circuit 2 20 carries out low-pass filtering and amplification to detection signal and reference signal respectively, then send Signal sampling and processing
Module 21,21 pairs of detection signals of Signal sampling and processing module and reference signal carry out data acquisition and data processing, are examined
The concentration of n kind detection gas in optical path is surveyed, the concentration data liquor charging crystal display screen of n kind detection gas is shown.
For the n kind gas of system detection, any i-th kind of gas concentration detects XiData processing method it is as follows：
Detection signal of the invention and calibration signal are pulse signal, and the every rotation of optical modulation plate 5 one week obtains simultaneously
The calibration signal of the detection signal and a cycle of a cycle, the detection signal and a cycle calibration signal of a cycle are equal
It is made of 2 × n pulse train.The 2 × i-1 pulse pair of the detection signal pulse sequence of a cycle answers light path
The absorption signal of i kind detection gas, the 2 × i pulse pair answer the reference signal of i-th kind of detection gas of light path；One week
The 2 × i-1 pulse pair of phase calibration signal pulse train should calibrate the absorption signal of i-th kind of detection gas of optical path, 2 × i
A pulse pair answers the reference signal of i-th kind of detection gas of light path.
After 21 pairs of detection signals of Signal sampling and processing module and calibration signal carry out data acquisition and multiple cumulative mean
Obtain a cycle analysis detection signal data M and a cycle analysis calibration signal data N.A cycle analysis inspection
The 2 × i-1 pulse data for surveying signal M is used as the detection absorption signal M of i-th kind of detection gas of light pathi, a cycle
Analysis is used as the detection reference signal M of i-th kind of detection gas of light path with the 2 × i pulse data of detection signal Mib；One
The calibration that the 2 × i-1 pulse pair of a cycle analysis calibration signal data N should calibrate i-th kind of detection gas of optical path absorbs
Signal Ni, a cycle, which is analyzed, answers the schools of i-th kind of detection gas of light path with the 2 × i pulse pair of calibration signal data N
Quasi- reference signal Nib.In known calibration absorption cell 6 filled with i-th kind of system detection gas concentration be Ci。
To the detection absorption signal M of i-th kind of detection gasiNumerical integration is carried out, the detection for obtaining i-th kind of detection gas is inhaled
Signal strength is received, MA is defined asi.To the detection reference signal M of i-th kind of detection gasibNumerical integration is carried out, i-th kind of inspection is obtained
The detection reference signal strength for surveying gas, is defined as MBi.To the calibration absorption signal N of i-th kind of detection gasiCarry out numerical value product
Point, obtain the calibration absorption signal N of i-th kind of detection gasiIntensity is defined as NAi.To the calibration reference letter of i-th kind of detection gas
Number NibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity is defined as NBi。
Define AiTo detect absorption signal intensity MAiWith detection reference signal strength MBiRatio, have：
Defining i-th kind of system detection gas concentration in light path is Xi, then have：
Wherein, YiFor system parameter, it is determined by experiment before being appeared on the scene with system, measuring method is as follows：
An atmospheric pressure high pure nitrogen will be filled in steam correcting absorptive pool, to the calibration absorption signal N of i-th kind of detection gasi
Numerical integration is carried out, the blank calibration absorption signal M of i-th kind of detection gas is obtainediIntensity is defined as NAi0.I-th kind is detected
The calibration reference signal N of gasibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity, definition
For NBi0。
Claims (5)
1. a kind of near infrared spectrum multicomponent gas on-line detecting system, it is characterised in that：It include host and external detection light
Road system, external detection light path system include transmitting-receiving optic probe, corner reflector；
The transmitting-receiving optic probe includes xenon flash lamp, cable interface one, is disposed with standard in the front optical path of xenon flash lamp
The transmitted light path of straight camera lens, optically filtering disk, beam splitter one, beam splitter one is equipped with beam splitter two, the transmitted light of beam splitter two
Road is successively arranged Fresnel Lenses, quartz window sheet, corner reflector, and calibration is successively arranged on the reflected light path of beam splitter one and is absorbed
The reflected light path in pond, infrared photoelectric detector two, beam splitter two is equipped with infrared photoelectric detector one；The beam splitter one divides
Beam mirror two, Fresnel Lenses, quartz window sheet, corner reflector, infrared photoelectric detector one constitute light path；The beam splitter
One, steam correcting absorptive pool, infrared photoelectric detector two constitute calibration optical path, filled with including known concentration n germline in steam correcting absorptive pool
The calibrating gas of system one atmospheric pressure of detection gas；The cable interface one and xenon flash lamp, optically filtering disk driving mechanism,
Infrared photoelectric detector one, infrared photoelectric detector two connect；
The host includes mainframe box, and host tank wall is equipped with cable interface two, AC Power supply socket, is equipped with difference in mainframe box
Light source pulse power supply, optically filtering disk the control power supply, low-pass filtering amplifying circuit one, low-pass filtering being connect with cable interface two
Amplifying circuit two, the signal output end and Signal sampling and processing of low-pass filtering amplifying circuit one, low-pass filtering amplifying circuit two
Module connection, signal output end and light source pulse power supply, the optically filtering disk of Signal acquiring and processing module control power supply, liquid crystal
Display screen connects, and D.C. regulated power supply is connected on AC Power supply socket, and D.C. regulated power supply is remaining each module in mainframe box
Power supply；
The cable interface one, two-way cross multicore cable connection, detection signal that infrared photoelectric detector one, two measures, reference
Signal is respectively connected to low-pass filtering amplifying circuit one, two.
2. a kind of near infrared spectrum multicomponent gas on-line detecting system according to claim 1, it is characterised in that：It is described
Optically filtering plate edge is uniformly provided with 2 × n light hole, and the optical filter for different logical optical wavelengths, needle are equipped on light hole
To i-th kind of detection gas, a corresponding Detection wavelength optical filter and a reference wavelength optical filter, Detection wavelength optical filter light passing
The absorption bands of the corresponding i-th kind of detection gas of wavelength, reference wavelength optical filter logical optical wavelength it is corresponding without i-th kind of detection gas and
The wave band that interference gas absorbs.
3. a kind of near infrared spectrum multicomponent gas on-line detecting system according to claim 1, it is characterised in that：It is described
Optically filtering plate edge is equipped with witness marker, detects for optical modulation plate turned position.
4. a kind of near infrared spectrum multicomponent gas online test method, it is characterised in that：For the n kind gas of system detection,
The data processing method of any i-th kind of gas concentration detection is as follows：
(1) start detection system, the every rotation of optical modulation plate one week, while obtaining the detection signal and a cycle of a cycle
Calibration signal, the detection signal and a cycle calibration signal of a cycle be made of 2 × n pulse train；One week
The 2 × i-1 pulse pair of the detection signal pulse sequence of phase answers the absorption signal of i-th kind of detection gas of light path, the 2nd ×
I pulse pair answers the reference signal of i-th kind of detection gas of light path；2 × i-1 of a cycle calibration signal pulse train
A pulse pair should calibrate the absorption signal of i-th kind of detection gas of optical path, and the 2 × i pulse pair answers i-th kind of detection gas of light path
The reference signal of body；
(2) Signal sampling and processing module obtains after carrying out data acquisition and multiple cumulative mean to detection signal and calibration signal
A cycle analysis detection signal data M and a cycle analysis calibration signal data N；A cycle analysis detection letter
The 2 × i-1 pulse data of number M is used as the detection absorption signal M of i-th kind of detection gas of light pathi, a cycle analysis
It is used as the detection reference signal M of i-th kind of detection gas of light path with the 2 × i pulse data of detection signal Mib；One week
Phase analyzes the calibration absorption signal that i-th kind of detection gas of optical path should be calibrated with the 2 × i-1 pulse pair of calibration signal data N
Ni, a cycle is analyzed answers the calibration of i-th kind of detection gas of light path to join with the 2 × i pulse pair of calibration signal data N
Examine signal Nib；In known calibration absorption cell filled with i-th kind of system detection gas concentration be Ci；
(3) to the detection absorption signal M of i-th kind of detection gasiNumerical integration is carried out, the detection for obtaining i-th kind of detection gas absorbs
Signal strength is defined as MAi；To the detection reference signal M of i-th kind of detection gasibNumerical integration is carried out, i-th kind of detection is obtained
The detection reference signal strength of gas, is defined as MBi；To the calibration absorption signal N of i-th kind of detection gasiNumerical integration is carried out,
Obtain the calibration absorption signal N of i-th kind of detection gasiIntensity is defined as NAi；To the calibration reference signal of i-th kind of detection gas
NibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity is defined as NBi；
Define AiTo detect absorption signal intensity MAiWith detection reference signal strength MBiRatio, BiTo calibrate absorption signal intensity
NAiWith calibration reference signal intensity NBiRatio, have：
Defining i-th kind of system detection gas concentration in light path is Xi, then have：
Wherein, YiFor system parameter.
5. a kind of near infrared spectrum multicomponent gas online test method according to claim 4, it is characterised in that：It is described
System parameter YiMeasuring method it is as follows：
An atmospheric pressure high pure nitrogen will be filled in steam correcting absorptive pool, to the calibration absorption signal N of i-th kind of detection gasiIt is counted
Value integral obtains the blank calibration absorption signal M of i-th kind of detection gasiIntensity is defined as NAi0；To i-th kind of detection gas
Calibration reference signal NibNumerical integration is carried out, the calibration reference signal N of i-th kind of detection gas is obtainedibIntensity is defined as NBi0；
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