CN102735645A - Online calibrating method of in-situ laser gas analyzer - Google Patents
Online calibrating method of in-situ laser gas analyzer Download PDFInfo
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- CN102735645A CN102735645A CN2012102342184A CN201210234218A CN102735645A CN 102735645 A CN102735645 A CN 102735645A CN 2012102342184 A CN2012102342184 A CN 2012102342184A CN 201210234218 A CN201210234218 A CN 201210234218A CN 102735645 A CN102735645 A CN 102735645A
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Abstract
The invention discloses an online calibrating method of an in-situ laser gas analyzer. A device comprises a laser emission unit, a signal detection unit, a laser device control module, a signal processing module, a data analysis module, a measurement pipeline and an online calibrating gas chamber. The calibrating method comprises the following steps : selectively carrying out online calibration when the concentration of gas in the measurement pipe is stable, firstly leading nitrogen into the online calibrating gas chamber; recording a gas absorption spectrum obtained by the signal detection unit at the moment by the signal processing module, then leading standard gas at special concentration into the online calibrating gas chamber, recording by the signal processing module the gas absorption spectrum obtained by the signal detection unit at the moment when the standard gas is led; subtracting by the signal processing module the gas absorption spectrum obtained at the moment when the nitrogen is led from the gas absorption spectrum obtained at the moment when the standard gas is led, and obtaining the absorption spectrum of the standard gas, so as to achieve the purpose of online calibration of the in-situ laser gas analyzer.
Description
Technical field:
The present invention relates to online gas-monitoring field, relate in particular to a kind of on-line proving device and scaling method of original position formula laser gas analyzer.
Background technology:
Tunable semiconductor laser absorption spectrum technology (TDLAS) is one of present state-of-the-art gasmetry technology; Obtained swift and violent development in recent years; Begun to be applied in various fields such as Aero-Space, oil, chemical industry, rock gas, metallurgy, environmental protection, be considered to have the brand-new measuring method of revolutionary change.
Laser gas analyzer based on the TDLAS technology mainly is divided into two types: original position formula laser gas analyzer and sampling type laser gas analyzer.Original position formula laser gas analyzer is directly installed on the measuring channel, and its advantage is to measure the response time weak point, does not need gas sampling to be measured and pretreated time, does not also need extra pretreatment system.The sampling type laser gas analyzer is that the gas to be measured in the measuring channel is drawn after pre-service; Feed laser gas analyzer; Thereby its advantage is can increase light path according to the measurement needs to improve measuring accuracy; Can the foreign material such as dust in the gas to be measured be removed through pretreatment system, thereby reduce its interference, can feed calibrating gas easily analyser is calibrated, demarcated and verifies measuring accuracy.
Through the research to prior art, the inventor finds, compares the calibration of original position formula laser gas analyzer, demarcation and verification method more complicated with the sampling type laser gas analyzer.Prior art can't realize the on-line proving of original position formula laser gas analyzer; Timing signal need remove original position formula laser gas analyzer from measuring channel; It is fixed to be installed in the enterprising rower of specific air chamber then, and demarcation is installed analyser on the return pipe road after accomplishing again.This process is too loaded down with trivial details, has increased the operation and the maintenance cost of original position formula laser gas analyzer greatly.
Summary of the invention
For solving the problems of the technologies described above; The object of the present invention is to provide a kind of on-line proving device and scaling method of original position formula laser gas analyzer; With when demarcating original position formula laser gas analyzer; Need it not pulled down from measuring channel, can be implemented in the line demarcation, thereby reduce the operation and the maintenance cost of original position formula laser gas analyzer greatly.
For realizing above-mentioned purpose, the invention provides following technical scheme:
A kind of on-line proving device of original position formula laser gas analyzer comprises: laser emission element, acquisition of signal unit, laser instrument control module, signal processing module, data analysis module, measuring channel and on-line proving air chamber;
Said laser instrument control module is connected to said laser emission element, is used for driving the laser of said laser emission element to the gas emission specific wavelength to be measured of said measuring channel;
Said acquisition of signal unit is used to obtain the transmission signal through tested gas, and said transmission signal is sent to said signal processing module;
Said signal processing module is used for converting said transmission signal into gas absorption spectra to be measured;
Said data analysis module is used to analyze said gas absorption spectra to be measured, obtains the information of gas to be measured.
Said measuring channel is used to flow through gas to be measured.
Said on-line proving air chamber is used to feed the calibrating gas of certain concentration.
Preferably, said signal processing module comprises:
Signal amplification unit is used to amplify the transmission signal that said signal sensor gets access to;
Signal demodulation unit is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
Preferably, said device also comprises:
Lock phase amplifying circuit is used for obtaining the frequency-doubled signal curve from gas absorption spectra to be measured;
Said data analysis module obtains the information of gas to be measured through the peak value of analyzing said frequency-doubled signal.
Preferably, said device also comprises:
Display module is connected to said data analysis module, is used to show the information of the gas to be measured that monitors.
Preferably, said laser instrument is semiconductor distributed feed-back formula laser instrument or semiconductor vertical cavity surface emitting laser.
Preferably, said laser control module comprises:
Temperature control unit is connected to said laser emission element, is used to control the working temperature of said laser instrument;
Current control unit is connected to said laser emission element, is used to modulate the electric current through said laser instrument.
Corresponding to the above-mentioned gas metering monitor, the present invention also provides a kind of online calibration method of original position formula laser gas analyzer, comprising:
During normal the measurement, feed nitrogen in the said on-line proving air chamber, do not influence normal measurement;
Preferably, select to carry out when gas concentration is stablized in the measuring channel on-line proving;
At first in said on-line proving air chamber, feed nitrogen, the gas absorption spectra that said signal processing module this moment of record is obtained by said acquisition of signal unit and said signal processing module;
In said on-line proving air chamber, feed the calibrating gas of certain concentration then, said signal processing module record feeds the gas absorption spectra that calibrating gas is obtained by said acquisition of signal unit and said signal processing module constantly;
Said signal processing module will feed calibrating gas gas absorption spectra constantly and deduct feeding nitrogen gas absorption spectra constantly; Just obtain the absorption spectrum of calibrating gas; Analyze the concentration that said calibrating gas absorption spectrum obtains calibrating gas; Analyser is carried out corresponding correction, thereby realize the on-line proving of original position formula laser gas analyzer;
Preferably, the said gas absorption spectra of said analysis obtains also comprising before the information of gas to be measured:
Obtain the pressure and temperature value of sample chamber in real time;
According to the accessed said gas absorption spectra of pressure and temperature value correction;
Use in the on-line proving device and scaling method of the original position formula laser gas analyzer that the embodiment of the invention provided; Adopt the on-line proving air chamber, can calibrate and demarcate original position formula laser gas analyzer through the mode that feeds nitrogen and calibrating gas successively.Therefore the on-line proving device of original position formula laser gas analyzer provided by the invention and scaling method need not original position formula laser gas analyzer pulled down and demarcate; Simplify the demarcation flow process of original position formula laser gas analyzer greatly, reduced the operation and the maintenance cost of original position formula laser gas analyzer.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the caliberating device that provides in the embodiment of the invention;
Fig. 2 adopts Wavelength modulation spectroscopy technology synoptic diagram for the scaling method that provides in the embodiment of the invention;
Fig. 3 is direct absorption spectrum technology synoptic diagram for the scaling method that provides in the embodiment of the invention adopts;
Embodiment
In the prior art what usually adopt is that original position formula laser gas analyzer is pulled down from measuring channel; Connect the method that air chamber carries out off-line calibration of demarcating then; After treating that off-line calibration is accomplished; Again laser gas analyzer is reinstalled on the measuring channel, thereby causes the calibration process of original position formula laser gas analyzer loaded down with trivial details, improved operation and maintenance cost.
For solving the embodiment of the invention on-line proving device of original position formula laser gas analyzer is provided; It is characterized in that, comprising: laser emission element, acquisition of signal unit, laser instrument control module, signal processing module, data analysis module, measuring channel and on-line proving air chamber; Said laser instrument control module is connected to said laser emission element, is used to drive the laser of said laser emission element emission specific wavelength; Said acquisition of signal unit is used for obtaining the transmission signal of laser through the tested gas of said measuring channel, and said transmission signal is sent to said signal processing module; Said signal processing module is used for converting said transmission signal into gas absorption spectra to be measured; Said data analysis module is used to analyze said gas absorption spectra to be measured, obtains the information of gas to be measured.Said measuring channel is the pipeline of gas stream warp to be measured.Said on-line proving air chamber is installed in the light path between said laser emission element and the said acquisition of signal unit, is used for the on-line proving of said original position formula laser gas analyzer.
On-line proving device based on above-mentioned original position formula laser gas analyzer; The embodiment of the invention also provides a kind of online calibration method of original position formula laser gas analyzer; Comprise: when normally measuring, feed nitrogen in the said on-line proving air chamber, do not influence normal measurement.Select to carry out on-line proving when gas concentration is stablized in the measuring channel, at first in said on-line proving air chamber, feed nitrogen, the gas absorption spectra that said signal processing module this moment of record is obtained by said acquisition of signal unit and said signal processing module.In said on-line proving air chamber, feed the calibrating gas of certain concentration then, said signal processing module record feeds the gas absorption spectra that calibrating gas is obtained by said acquisition of signal unit and said signal processing module constantly.Said signal processing module will feed calibrating gas gas absorption spectra constantly and deduct feeding nitrogen gas absorption spectra constantly, just obtain the absorption spectrum of calibrating gas, thereby realize the on-line proving of original position formula laser gas analyzer.
Caliberating device that the specific embodiment of the invention provides and method can realize the on-line proving of original position formula laser gas analyzer, and timing signal needn't be dismantled original position formula laser gas analyzer, have simplified the demarcation flow process of original position formula laser gas analyzer greatly.
It more than is the application's core concept; To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention carried out clear, intactly description, obviously; Described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment:
A kind of structural representation of the original position formula laser gas analyzer on-line proving device that Fig. 1 provides for the embodiment of the invention, this device comprises:
Laser emission element 101, acquisition of signal unit 102, laser instrument control module 103, signal processing module 104, data analysis module 105, measuring channel 106, on-line proving air chamber 107 and display unit 108.
Said laser instrument control module 103 is connected to said laser emission element 101, is used for driving the laser of said laser emission element 101 to the gas emission specific wavelength to be measured of said measuring channel 106.
Said laser emission element 101 can be tunable diode laser, concrete can be semiconductor distributed feed-back formula laser instrument or semiconductor vertical cavity surface emitting laser.
Said laser instrument control module 103; Operating temperature that can be through changing laser instrument and pass through electric current; Come the laser of drive laser modulate emission specific wavelength, frequency and waveform, the wherein common waveform that adopts can be sawtooth wave, triangular wave and sine wave.Said laser instrument control module specifically can comprise: temperature control unit 103a, be connected to said laser emission element, and be used to control the working temperature of said laser instrument; Current control unit 103b; Be connected to said laser emission element, be used to modulate electric current, the modulation of laser instrument input current through said laser instrument; Not only can change the output power of laser instrument, the output wavelength of modulated laser scans the absorption spectrum spectral line of gas to be measured simultaneously.Through laser instrument control module 103 control laser emission elements 101 continuous tuning in the certain wavelengths scope, make gas to be measured in this particular range of wavelengths, have absorption line.
Said acquisition of signal unit 102 is used to obtain the transmission signal through said measuring channel 106 gases to be measured, and said transmission signal is sent to said signal processing module 104.Said acquisition of signal unit 102 can convert said transmission signal into electric signal by light signal.
Said signal processing module 104 is used for converting said transmission signal into gas absorption spectra to be measured.In order to improve measure monitor result's precision; Before converting transmission signal into gas absorption spectra to be measured; Can also amplify said transmission signal; Therefore, said signal processing module specifically can comprise: signal amplification unit 104a is used to amplify the transmission signal that said signal sensor gets access to; Signal demodulation unit 104b is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
Said data analysis module 105 is used to analyze said gas absorption spectra to be measured, obtains the information of gas to be measured.
Feed gas to be measured in the said measuring channel 106.
Said on-line proving air chamber 107 is installed in the light path between laser instrument and the detector, is used to feed the calibrating gas of nitrogen and certain concentration, is used for the on-line proving of original position formula laser gas analyzer.Said on-line proving air chamber 107 both can be installed in laser emission element one side also can be installed in acquisition of signal unit one side.Said on-line proving air chamber 107 also comprises the space of any specific length between laser instrument and the detector including, but not limited to specific independently air chamber.The structure and the structural similarity shown in Figure 1 of traditional original position formula laser gas analyzer, but lack the air chamber of on-line proving described in the embodiment 107 among the present invention.Traditional original position formula laser gas analyzer is carrying out timing signal, need the transmitting terminal and the receiving end of analyser be removed from measuring channel, connects the demarcation air chamber then and demarcates accordingly and calibrate.
In addition, as shown in Figure 1, the original position formula laser gas analyzer on-line proving device that present embodiment provides can also comprise: display module 108, be connected to said data analysis module 105, and be used to show the information of the gas to be measured that monitors.
The original position formula laser gas analyzer online calibration method that the embodiment of the invention provides is following:
When original position formula laser gas analyzer was normally measured, said on-line proving air chamber 107 fed nitrogen continuously, because nitrogen does not have absorption line to infrared wavelength, therefore can not influence the operate as normal and the measurement of original position formula laser gas analyzer.
Original position formula laser gas analyzer is carried out timing signal, carries out according to following steps:
Select said measuring channel 106 ducted gases to be in the stable moment, promptly in a period of time, the gas concentration to be measured in the said measuring channel 106 remains unchanged basically, and it is basicly stable that pressure and temperature keeps.
Feed nitrogen in the said on-line proving air chamber 107 continuously, said this gas absorption spectra constantly of signal processing module 104 records, when adopting the Wavelength modulation spectroscopy technology, this gas absorption spectrum line is shown in last figure among Fig. 2; When adopting direct absorption spectrum technological, this gas absorption spectrum line is shown in last figure among Fig. 3.The gas absorption spectrum line of this moment record is the absorption line in gas to be measured or the background gas in the said measuring channel 106.
In said on-line proving air chamber 107, feed the calibrating gas of certain concentration then continuously, said this gas absorption spectra constantly of signal processing module 104 records, when adopting the Wavelength modulation spectroscopy technology, this gas absorption spectrum line is shown in figure among Fig. 2; When adopting direct absorption spectrum technological, this gas absorption spectrum line is shown in figure among Fig. 3.The gas absorption spectrum line of this moment record is the absorption line sum of calibrating gas in gas to be measured or background gas and the said on-line proving air chamber 107 in the said measuring channel 106.
Because the gas in the said measuring channel 106 of timing signal is in steady state (SS); When adopting the Wavelength modulation spectroscopy technology; The gas absorption spectrum line of scheming among Fig. 2 is deducted the gas absorption spectrum line of the last figure of Fig. 2; Just obtain the calibrating gas absorption line in the said on-line proving air chamber 107, shown in Fig. 2 figure below; When adopting direct absorption spectrum technology, the gas absorption spectrum line of scheming among Fig. 3 is deducted the gas absorption spectrum line of the last figure of Fig. 3, just obtain the calibrating gas absorption line in the said on-line proving air chamber 107, shown in Fig. 3 figure below.
According to the calibrating gas absorption line that obtains, and corresponding pressure and temperature measurement result, original position formula analyser just can carry out corresponding concentration calibration.
When adopting direct absorption spectrum technology and wavelength-modulated absorption spectrum technology, the theoretical formula of concrete calibration is following:
When adopting direct absorption spectrum technological, said data analysis module can be revised original position formula laser gas analyzer based on following mode:
Based on the principle of lambert-law of Beer (Beer-Lambert ' s law), lambert-law of Beer has been described the relation of transmitted light intensity and incident intensity when monochromatic light passes the uniform gas medium.Lambert-law of Beer is referring to formula 1:
Wherein, τ
νTransmissivity for laser; I
tAnd I
oBe respectively the initial light intensity and the transmitted light intensity of laser; α (ν) [cm
-1] be the absorption coefficient of spectrum; L [cm] is an optical path length.α (ν) L represents the absorption intensity of spectrum.Initial light intensity I
0Can obtain through following mode: 1, choose in the transmitted light intensity not by the part of gas absorption, carry out fitting of a polynomial, obtain initial light intensity I
02, the output laser of laser instrument is divided into two bundles, a branch of light is through an appearance air chamber, and another bundle is used to obtain the initial light intensity of laser through pick-up unit.3, at laser instrument set inside laser intensity detector, the initial light intensity signal of laser intensity signal conduct that adopts this detector to obtain.
Wherein P [atm] is a stagnation pressure, and the numerical value of pressure can measure through pressure transducer, and L [cm] is an optical path length, confirms that by the length of on-line proving air chamber X is the concentration of the concentration gas to be measured of marked gas, S (T) [cm
-2/ atm] be absorption intensity, A [cm
-1] be the spectrum integral area.
Because of integral area is proportional to the dividing potential drop of tested gas, therefore according to formula 2, the concentration X of gas to be measured can be obtained by formula 3:
Wherein P [atm] is a stagnation pressure, and L [cm] is an optical path length, S (T) [cm
-2/ atm] be absorption intensity, A [cm
-1] be the spectrum integral area.
Because during calibration; The calibrating gas concentration that feeds in the on-line proving air chamber is known; Can the measurement result and the known standard gas concentration of original position formula laser gas analyzer be compared; Thereby revise accordingly to guarantee that measurement result is consistent with calibrating gas concentration, accomplish the on-line proving of original position formula laser gas analyzer.
When adopting the modulated optical absorption spectra technology, laser control module is launched the specific laser bundle with low frequency sawtooth wave and high_frequency sine wave stack rear drive laser instrument to the sample chamber.
Said gas metering monitoring device can also comprise: lock phase amplifying circuit is used for obtaining the frequency-doubled signal curve from gas absorption spectra to be measured; Lock-in amplifier can be transferred to high-frequency region from low frequency region with measuring the territory, can obviously reduce noise, improves accuracy of detection.
Said data analysis module obtains the information of gas to be measured through the peak value of analyzing said frequency-doubled signal, and concrete account form is following:
The output frequency of laser instrument is shown in formula (4):
Wherein
Be the centre frequency of laser instrument, a [cm
-1] be modulation amplitude, f
m[Hz] is modulating frequency.Spectral transmission factor can pass through Taylor series (formula 5) to launch:
Wherein
is the n level Fourier coefficient of transmission absorption, shown in formula (6) and formula (7):
To gas absorption intensity when more weak, referring to formula 8:
SPX φ (v) L≤0.05 formula 8.
Transmission coefficient can be approximated to be shown in the formula 9:
N subharmonic Fourier coefficient can be reduced to shown in the formula 10:
Wherein, two frequencys multiplication (2f) signal is by the most widely used signal.Main cause has 2 points: the center that the line style symmetry of two frequency-doubled signals and peak value are positioned at spectral line; Two frequencys multiplication are signals the strongest in the even harmonic.Two frequency-doubled signals are not only relevant with the spectrum parameter (for example absorption intensity) of spectral line, and with relating to parameters such as modulation amplitude.
According to formula (10), the Fourier coefficient of second harmonic is shown in formula 11:
By above-mentioned formula,, can calculate the content of gas to be measured in sample gas in conjunction with peak value that obtains the frequency-doubled signal curve in the gas absorption spectra to be measured or curve line style.The concentration of this result of calculation and calibrating gas is compared, thereby revise accordingly, accomplish the on-line proving of original position formula laser gas analyzer to guarantee that measurement result is consistent with calibrating gas concentration.
In the on-line proving device and scaling method of the original position formula laser gas analyzer that the embodiment of the invention provided, adopt the on-line proving air chamber, can calibrate and demarcate original position formula laser gas analyzer through the mode that feeds nitrogen and calibrating gas successively.Therefore the on-line proving device of original position formula laser gas analyzer provided by the invention and scaling method need not original position formula laser gas analyzer pulled down and demarcate; Simplify the demarcation flow process of original position formula laser gas analyzer greatly, reduced the operation and the maintenance cost of original position formula laser gas analyzer.
For method embodiment of the present invention, because it is basically corresponding to device embodiment, relevant part gets final product referring to the part explanation of installing embodiment.Device embodiment described above only is schematic; Wherein said unit as the separating component explanation can or can not be physically to separate also; The parts that show as the unit can be or can not be physical locations also; Promptly can be positioned at a place, perhaps also can be distributed on a plurality of equipment.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
In several embodiment that the application provided, should be understood that the apparatus and method that disclosed not surpassing in the application's the spirit and scope, can realize through other mode.Current embodiment is a kind of exemplary example, should be as restriction, and given particular content should in no way limit the application's purpose.For example, the division of said unit or subelement only is that a kind of logic function is divided, and during actual the realization other dividing mode can be arranged, and for example a plurality of unit or a plurality of subelement combine.In addition, a plurality of unit can or assembly can combine or can be integrated into another system, or some characteristics can ignore, or do not carry out.
In addition, the synoptic diagram of institute's tracing device and method and different embodiment, in the scope that does not exceed the application, can with other system, module, technology or method combine or are integrated.Another point, the coupling each other that shows or discuss or directly coupling or communication to connect can be through some interfaces, the indirect coupling of device or unit or communication connect, and can be electrically, machinery or other form.
Each embodiment adopts the mode of going forward one by one to describe in this instructions, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (7)
1. the on-line proving device and the scaling method of an original position formula laser gas analyzer; It is characterized in that, comprising: laser emission element, acquisition of signal unit, laser instrument control module, signal processing module, data analysis module, measuring channel and on-line proving air chamber;
Said laser instrument control module is connected to said laser emission element, is used for driving the laser of said laser emission element to the gas emission specific wavelength to be measured of said measuring channel;
Said acquisition of signal unit is used to obtain the transmission signal through tested gas, and said transmission signal is sent to said signal processing module;
Said signal processing module is used for converting said transmission signal into gas absorption spectra to be measured;
Said data analysis module is used to analyze said gas absorption spectra to be measured, obtains the information of gas to be measured;
Said measuring channel is used to flow through gas to be measured;
Said on-line proving air chamber is used to feed the calibrating gas of certain concentration;
Said scaling method is used for the calculated signals and the processing of the on-line proving of said original position formula laser gas analyzer.
2. device according to claim 1 is characterized in that, said signal processing module comprises:
Signal amplification unit is used to amplify the transmission signal that said signal sensor gets access to;
Signal demodulation unit is used for the transmission signal after demodulation is amplified, and obtains gas absorption spectra to be measured.
3. device according to claim 1 is characterized in that, also comprises:
Said data analysis module is through analyzing the information that said gas absorption spectra to be measured obtains gas to be measured.
4. device according to claim 1 is characterized in that, said laser control module comprises:
Temperature control unit is connected to said laser emission element, is used to control the working temperature of said laser instrument;
Current control unit is connected to said laser emission element, is used to modulate the electric current through said laser instrument.
5. device according to claim 1 is characterized in that, also comprises:
Said on-line proving air chamber is installed in the light path between said laser emission element and the said acquisition of signal unit;
Said on-line proving air chamber can be installed in any side of said measuring channel..
6. device according to claim 1 is characterized in that:
Said on-line proving air chamber also comprises the space of any specific length between laser instrument and the detector including, but not limited to specific independently air chamber.
7. scaling method according to claim 1 is characterized in that, comprising:
During normal the measurement, feed nitrogen in the said on-line proving air chamber, do not influence normal measurement;
Select to carry out when gas concentration is stablized in the measuring channel on-line proving;
At first in said on-line proving air chamber, feed nitrogen, the gas absorption spectra that said signal processing module this moment of record is obtained by said acquisition of signal unit and said signal processing module;
In said on-line proving air chamber, feed the calibrating gas of certain concentration then, said signal processing module record feeds the gas absorption spectra that calibrating gas is obtained by said acquisition of signal unit and said signal processing module constantly;
Said signal processing module will feed calibrating gas gas absorption spectra constantly and deduct feeding nitrogen gas absorption spectra constantly; Just obtain the absorption spectrum of calibrating gas; Analyze the concentration that said calibrating gas absorption spectrum obtains calibrating gas; Analyser is carried out corresponding correction, thereby realize the on-line proving of original position formula laser gas analyzer.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018340A (en) * | 2016-07-13 | 2016-10-12 | 杭州泽天科技有限公司 | In-situ laser gas analyzer with on-line deviation correction device |
| CN107328738A (en) * | 2017-06-28 | 2017-11-07 | 武汉米字能源科技有限公司 | The double air chamber trace gas analysis systems of one kind series connection and gas concentration calculate method |
| CN109613180A (en) * | 2018-11-27 | 2019-04-12 | 聚光科技(杭州)股份有限公司 | Scaling method in situ |
| CN110231313A (en) * | 2019-04-25 | 2019-09-13 | 光力科技股份有限公司 | A kind of online zero point correction method and device of laser gas analyzer |
| CN111999262A (en) * | 2020-08-26 | 2020-11-27 | 国网重庆市电力公司电力科学研究院 | Method and system for detecting hydrogen fluoride gas harmonic absorption |
| CN112697740A (en) * | 2020-12-10 | 2021-04-23 | 山东省科学院海洋仪器仪表研究所 | Detection system and detection method for dissolved methane in surface seawater |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5660746A (en) * | 1994-10-24 | 1997-08-26 | University Of South Florida | Dual-laser process for film deposition |
| CN101403692A (en) * | 2008-10-27 | 2009-04-08 | 北京北分麦哈克分析仪器有限公司 | Laser gas analyzer and its calibration method |
-
2012
- 2012-07-06 CN CN2012102342184A patent/CN102735645A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5660746A (en) * | 1994-10-24 | 1997-08-26 | University Of South Florida | Dual-laser process for film deposition |
| CN101403692A (en) * | 2008-10-27 | 2009-04-08 | 北京北分麦哈克分析仪器有限公司 | Laser gas analyzer and its calibration method |
Non-Patent Citations (2)
| Title |
|---|
| 张志荣等: "基于TDLAS技术的工业环境中HF气体在线监测", 《光电子.激光》 * |
| 王健等: "微波等离子体中OH自由基的光腔衰荡光谱诊断", 《真空科学与技术学报》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106018340A (en) * | 2016-07-13 | 2016-10-12 | 杭州泽天科技有限公司 | In-situ laser gas analyzer with on-line deviation correction device |
| CN106018340B (en) * | 2016-07-13 | 2020-08-04 | 杭州泽天科技有限公司 | In-situ laser gas analyzer with on-line deviation correcting device |
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| CN112697740A (en) * | 2020-12-10 | 2021-04-23 | 山东省科学院海洋仪器仪表研究所 | Detection system and detection method for dissolved methane in surface seawater |
| CN112697740B (en) * | 2020-12-10 | 2022-09-23 | 山东省科学院海洋仪器仪表研究所 | Detection system and detection method for dissolved methane in surface seawater |
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