CN1758051A - Undispersed infrared method multicomponent gas analyser based on gas filter correlation - Google Patents
Undispersed infrared method multicomponent gas analyser based on gas filter correlation Download PDFInfo
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- CN1758051A CN1758051A CN 200510041139 CN200510041139A CN1758051A CN 1758051 A CN1758051 A CN 1758051A CN 200510041139 CN200510041139 CN 200510041139 CN 200510041139 A CN200510041139 A CN 200510041139A CN 1758051 A CN1758051 A CN 1758051A
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Abstract
The invention discloses a kind of undispersed infrared method multicomponent gas analyser, be broadly divided into several parts such as light source, associated wheel, White pond, optical filter, detector, prime amplifier, data processing plate based on gas filter correlation.Utilize the method for non-dispersion infrared, adopt a light source, in a White pond, detect CO, CH simultaneously
4The concentration of two kinds of gases.Degree of accuracy of the present invention and resolution have all had than prior art and have significantly improved.
Description
Technical field
The invention belongs to a kind of environment measuring, environmental analysis, Detection of Air Quality equipment, specifically is a kind of undispersed infrared method multicomponent gas analyser based on gas filter correlation.
Background technology
The qualitative and quantitative analysis of multicomponent gas has a wide range of applications in fields such as environmental protection, chemical industry control, family expenses warning, food fresh keeping, greenhouse control, Aero-Space.The using gases sensor carries out the qualitative, quantitative research of multicomponent gas, can reduce the measurement cost greatly, reduces measuring period, and can realize online real-time measurement.But, use single-sensor to be difficult to realize the check and analysis of multicomponent gas because current gas sensor ubiquity shortcomings such as cross sensitivity and poor selectivity.
Adopt infrared method to carry out the analysis of multicomponent gas, then have defectives such as degree of accuracy is poor, resolution is low.
Summary of the invention
The purpose of this invention is to provide a kind of undispersed infrared method multicomponent gas analyser based on gas filter correlation, is the method for utilizing non-dispersion infrared, adopts a light source, in a White pond, detects the concentration of CO, two kinds of gases of CH4 simultaneously.
Technical scheme of the present invention is as follows:
Undispersed infrared method multicomponent gas analyser based on gas filter correlation is characterized in that having a White pond, at the incident window place in White pond power supply base is installed, and the outgoing window place in White pond is equipped with the detector seat; A perforate is arranged on power supply base, Nernst glower is installed in the perforate, the power supply base outside is installed with motor, and machine shaft passes power supply base, and associated wheel is installed on the machine shaft, between base and White pond incident window, same circumferential position on the associated wheel is laid three glass chambeies, and pure N2, high concentration CH4 are housed respectively in the chamber, with high concentration CO gas, the incident window in Nernst glower and glass chamber, White pond is on input path; On the detector seat infrared eye is installed, detector outside is installed with motor, machine shaft passes the detector seat, optical filter wheel is installed on the machine shaft, between detector seat and White pond outgoing window, CO optical filter and CH4 optical filter are installed on the optical filter wheel, and the outgoing window in White pond, optical filter, detector are positioned on the emitting light path; The signal of detector is received prime amplifier and data processing equipment.
Infrared eye is that the PbS material is made, and corresponding wave band is between 2-5 micron.
Apparatus of the present invention are broadly divided into several parts such as light source, associated wheel, White pond, optical filter, detector, prime amplifier, data processing plate.
Light source: adopt the Nernst glower of nickel-chrome, this lamp has good radiation at infrared 2-5 micron place, can be used as the light source of near infrared part fully.And light intensity is big, stable performance.
Associated wheel:
The effect one of associated wheel is to be modulated into impulse radiation to continuous optical radiation; The 2nd, on associated wheel, lay three little glass air chamber, put pure N2 respectively, high concentration CH4, high concentration CO gas.Like this, the optical radiation by N2 is exactly the light quantity of carrying out probe gas, and the optical radiation by CH4 and Co is just as using in follow-up calculating with reference to amount.
The White pond:
Be full of gas to be measured in the White pond of sealing, the radiant light that light source sends is come in from the incident window, through the catoptron that being contained in two ends, White pond come back reflective certain after, penetrate from the outgoing window and to be detected device and to receive.In this process, gas to be measured is the absorbed radiation light intensity,
Optical filter wheel:
Adorn two optical filters on optical filter wheel, one is that centre wavelength is 4.65 microns CO gas optical filter, and one is that centre wavelength is 3.3 microns CH4 gas optical filter.
Because the spectral range of radiation of light source is very wide, so before detector is surveyed, the stray light of other wave band is filtered with these two optical filters.This optical filter wheel is rotary, when needs are surveyed CO gas, rotates optical filter wheel and will adjust to the detector front to the optical filter of CO; When needs are surveyed CH4 gas, rotate optical filter wheel and will adjust to the detector front to the optical filter of CH4.
Detector:
The infrared eye that adopts is that the PbS material is made.Corresponding wave band is between 2-5 micron.The effect of detector in analyser is extremely important, and its performance will directly determine measuring stability and accuracy.
Prime amplifier:
Prime amplifier is feeble signal amplification, the shaping that is used for detector is come out, thereby becomes the signal that can satisfy the subsequent calculations needs.
Data processing plate:
Be sent to data processing plate from the analog electrical signal of prime amplifier output, carry out related algorithm in data processing plate, the result who obtains carries out the AD conversion, and shows on liquid crystal display.
Measuring principle
First point: various molecules have different energy levels, no matter be to absorb external radiation energy or outside radiant generation transition, specific separately frequency are arranged all.That is to say that the frequency that meets certain molecule defined as the frequency of external radiation energy just might be absorbed by this kind molecule, and produce the selectively endergonic transition of what is called.And when producing this transition, the electromagnetic radiation wave frequency is inevitable with to absorb desired frequency numerical value identical.The selectivity of the energy of Here it is various molecule absorption radiation or radiated electromagnetic wave, this selectivity is for frequency.This frequency just is called the characteristic frequency of various molecules, or characteristic wavelength.At 4.65 microns places, CO has characteristic absorption, that is, CO has characteristic absorption wavelength at 4.65 microns places.And CH4 has characteristic absorption wavelength at 3.3 microns places.
Second point: the characteristics at the infrared spectral range of 0.76 micron-25 micrometer range are that it is very strong to the radianting capacity of heat energy, therefore utilize molecule the infrared heat effect to be carried out another basis of constituent analysis.
Thirdly: according to Beer law.Gas is followed Lambert-Beer's law to the absorption of infrared light within certain scope, that is:
I
1＝L
0E
-KCL
In the formula: I
0---the zero energy of infrared radiation;
I
1---the energy of infrared radiation after by gas absorption;
The infrared absorption coefficient of K---gas;
L---light path, promptly infrared light is by the thickness of gas blanket;
The concentration of C---tested gas.
K is an absorption characteristic coefficient of gas, different gas, and this value is different.Law shows that the size of absorption is directly relevant with the character of gas, light path and gas concentration.So, when one timing of air chamber length L, as seen from the above equation, I
1Size only relevant with gas concentration, measure I
1The size variation that just equals to measure gas concentration.
Based on above principle, the course of work is as follows:
1. after the Nernst glower energising,, send stable infrared radiation through heating.
2. the driven by motor associated wheel rotates, and rotates in the process in a week, and continuous light is modulated into three-beam and enters the White pond, promptly, continuous light a branch of when the N2 glass chamber, continuous light a branch of during, continuous light a branch of during by high concentration CH4 glass chamber by the high concentration CO glass chamber.
3. because at 2-5 micrometer range, N2 does not absorb, so this Shu Guang is the measuring-signal as CO and CH4 in follow-up process, temporarily is called signal 1.A branch of through this of high concentration CO glass chamber, the energy at 4.65 microns places of characteristic absorption part of CO is absorbed fully, so this Shu Guang is the reference signal as CO in follow-up process, temporarily is called signal 2.A branch of through this of excessive concentrations glass CH4 glass cavity, the energy at 3.3 microns places of characteristic absorption part of CH4 is absorbed fully, so this Shu Guang is the reference signal as CH4 in follow-up process, temporarily is called signal 3.
4. signal 2 and signal 3 enter in the White pond, through after certain light path, light intensity does not change, and signal 1 enters the White pond, through after certain light path, can be sponged a part of infrared energy by CH4 and CO at 3.3 and 4.65 microns places, degree of absorption is relevant with the concentration of gas,, be exactly the concentration information that has comprised CO and CH4 like this in the signal 1.
5. come in the White pond after back reflective N time, radiant light penetrates the White pond through small holes, and the number of times of reflection configures in advance, and order of reflection decide, and optical length is also just definite.
6. having at outgoing aperture place can self-adjusting two optical filter, and accurate optical filter only allows respectively that the light that CO and CH4 absorb characteristic wavelength passes through, so just got rid of the interference of other gas like this.
7. when radiant light during through the CO optical filter, the absorption signal of CH4 part will be excluded in the signal 1, be exactly merely and the concentration dependent signal of CO and detector obtained, be equivalent to the I in the Lambert-Beer's law
1, signal 2 just is equivalent to I
0, and that signal 3 just becomes for the calculating of CO concentration is meaningless.So just can calculate the concentration value of CO by these two signal values.
8. same, when radiant light during through the CH4 optical filter, the absorption signal of CO part will be excluded in the signal 1, be exactly merely and the concentration dependent signal of CH4 and detector obtained, be equivalent to the I in the Lambert-Beer's law
1, signal 2 just is equivalent to I
0, and that signal 2 just becomes for the calculating of CH4 concentration is meaningless.So just can calculate the concentration value of CH4 by these two signal values.
9. mating plate radiant light is afterwards detected by infrared eye after filtration.
10. convert thereof into magnitude of voltage by prime amplifier again.
11. giving data processing plate, magnitude of voltage carries out related operation.
12. just drawn the concentration of CO and CH4 after the computing.
The degree of accuracy of apparatus of the present invention, resolution have all had than prior art and have significantly improved.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is an associated wheel structural representation of the present invention.
Fig. 3 is an optical filter wheel structural representation of the present invention.
Embodiment
Undispersed infrared method multicomponent gas analyser based on gas filter correlation, it is characterized in that having a White pond 1, at incident window 2 places in White pond 1 power supply base 3 is installed and is fixedly mounted on White pond 1 left side wall, outgoing window 12 places in White pond 1 are equipped with detector seat 4 and are fixedly mounted on White pond 1 right side wall; A perforate 9 is arranged on power supply base 3, in the perforate 9 Nernst glower is installed, power supply base 3 outsides are installed with motor 8, and power supply base 3 is passed in motor 8 rotating shafts, in motor 8 rotating shafts associated wheel 7 are installed, between base 3 and White pond incident window 2, same circumferential position on the associated wheel 7 is laid three glass chambeies 13, and pure N2, high concentration CH4 are housed respectively in the chamber, with high concentration CO gas, the incident window 2 in Nernst glower and glass chamber 3, White pond is on input path; Infrared eye 14 is installed on the detector seat 4, detector 14 outsides are installed with motor 5, detector seat 4 is passed in motor 5 rotating shafts, in motor 5 rotating shafts optical filter wheel 6 is installed, between detector seat 4 and White pond outgoing window 12, CO optical filter 15 and CH4 optical filter 16 are installed on the optical filter wheel 6, and the outgoing window 12 in White pond 1, optical filter 15,16, detector 14 are positioned on the emitting light path; The signal of detector 14 is received prime amplifier 10 and data processing equipment 11.
Claims (2)
1, based on the undispersed infrared method multicomponent gas analyser of gas filter correlation, it is characterized in that having a White pond, at the incident window place in White pond power supply base is installed, the outgoing window place in White pond is equipped with the detector seat; A perforate is arranged on power supply base, Nernst glower is installed in the perforate, the power supply base outside is installed with motor, and machine shaft passes power supply base, and associated wheel is installed on the machine shaft, between base and White pond incident window, same circumferential position on the associated wheel is laid three glass chambeies, and pure N2, high concentration CH4 are housed respectively in the chamber, with high concentration CO gas, the incident window in Nernst glower and glass chamber, White pond is on input path; On the detector seat infrared eye is installed, detector outside is installed with motor, machine shaft passes the detector seat, optical filter wheel is installed on the machine shaft, between detector seat and White pond outgoing window, CO optical filter and CH4 optical filter are installed on the optical filter wheel, and the outgoing window in White pond, optical filter, detector are positioned on the emitting light path; The signal of detector is received prime amplifier and data processing equipment.
2, analyser according to claim 1 is characterized in that infrared eye is that the PbS material is made, and corresponding wave band is between 2-5 micron.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102095699A (en) * | 2011-01-26 | 2011-06-15 | 宇星科技发展(深圳)有限公司 | Multicomponent gas analyzer and gas analysis detection system |
| CN102103075A (en) * | 2011-01-18 | 2011-06-22 | 江苏远望仪器有限公司 | Gas infrared absorption detection method |
| CN102183481A (en) * | 2011-01-18 | 2011-09-14 | 江苏远望仪器有限公司 | Gas infrared absorption detection device |
| CN102455286A (en) * | 2010-10-25 | 2012-05-16 | 通用电气公司 | Gas analyzer for measuring at least two components of a gas |
| CN102004283B (en) * | 2009-09-02 | 2012-05-23 | 中国科学院半导体研究所 | Optical fiber coupling White cavity |
| CN102507461A (en) * | 2011-11-02 | 2012-06-20 | 南京智达分析仪器有限公司 | Negative-filtering type two-component infrared gas analyzer |
| CN107044958A (en) * | 2017-03-17 | 2017-08-15 | 哈尔滨工业大学 | A kind of measured oxygen concentration system and measuring method based on ultraviolet two grades of absorption spectrums in broadband |
| CN108982398A (en) * | 2018-07-02 | 2018-12-11 | 中船重工安谱（湖北）仪器有限公司 | A kind of long light path trace toxic and harmful gas detection device |
| CN109765184A (en) * | 2019-01-16 | 2019-05-17 | 深圳供电局有限公司 | Optical gas absorbance pond and optical gas detection system |
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2005
- 2005-07-19 CN CN 200510041139 patent/CN1758051A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102004283B (en) * | 2009-09-02 | 2012-05-23 | 中国科学院半导体研究所 | Optical fiber coupling White cavity |
| CN102455286A (en) * | 2010-10-25 | 2012-05-16 | 通用电气公司 | Gas analyzer for measuring at least two components of a gas |
| CN102103075A (en) * | 2011-01-18 | 2011-06-22 | 江苏远望仪器有限公司 | Gas infrared absorption detection method |
| CN102183481A (en) * | 2011-01-18 | 2011-09-14 | 江苏远望仪器有限公司 | Gas infrared absorption detection device |
| CN102095699A (en) * | 2011-01-26 | 2011-06-15 | 宇星科技发展(深圳)有限公司 | Multicomponent gas analyzer and gas analysis detection system |
| CN102507461A (en) * | 2011-11-02 | 2012-06-20 | 南京智达分析仪器有限公司 | Negative-filtering type two-component infrared gas analyzer |
| CN107044958A (en) * | 2017-03-17 | 2017-08-15 | 哈尔滨工业大学 | A kind of measured oxygen concentration system and measuring method based on ultraviolet two grades of absorption spectrums in broadband |
| CN107044958B (en) * | 2017-03-17 | 2019-05-14 | 哈尔滨工业大学 | A kind of measured oxygen concentration method of the measured oxygen concentration system based on ultraviolet broadband second level absorption spectrum |
| CN108982398A (en) * | 2018-07-02 | 2018-12-11 | 中船重工安谱（湖北）仪器有限公司 | A kind of long light path trace toxic and harmful gas detection device |
| CN109765184A (en) * | 2019-01-16 | 2019-05-17 | 深圳供电局有限公司 | Optical gas absorbance pond and optical gas detection system |
| CN109765184B (en) * | 2019-01-16 | 2022-06-07 | 深圳供电局有限公司 | Optical gas absorption cell and optical gas detection system |
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