CN104267018B - The processing method of gas concentration signal in a kind of Raman gas analyzer - Google Patents
The processing method of gas concentration signal in a kind of Raman gas analyzer Download PDFInfo
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- CN104267018B CN104267018B CN201410583555.3A CN201410583555A CN104267018B CN 104267018 B CN104267018 B CN 104267018B CN 201410583555 A CN201410583555 A CN 201410583555A CN 104267018 B CN104267018 B CN 104267018B
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Abstract
The processing method of gas concentration signal in a kind of Raman gas analyzer of the present invention, it is related to signal processing method, and the processing method of gas concentration signal, is comprised the following steps that in particularly a kind of Raman gas analyzer：1）Obtain original spectrum signal；2）Spectral signal pre-processes；3）Calculate each component gas concentration；4）Judge whether high concentration signal is stablized, if unstable, directly export each component gas concentration；If stable, the after-treatment of low concentration spectral signal is carried out, then recalculates each component gas concentration, then export each component gas concentration.The method of the present invention can not only effectively eliminate the influence of random noise disturbance, ensure the precision of measurement, and can meet the requirement of response time.
Description
Technical field
The present invention relates to signal processing method, the processing side of gas concentration signal in particularly a kind of Raman gas analyzer
Method.
Background technology
, can be to measured gas concentration signal in order to ensure the precision of measurement in LR laser raman gas analyzer
Handled, the method for processing amplifies gas concentration signal for stacking method, but these be required for using sacrifice the response time as
Cost.The present invention is exactly to solve the contradiction between the measurement accuracy of instrument and response time.
The content of the invention
The present invention mainly solves the technical problem present in prior art；Providing a kind of can not only effectively eliminate
The influence of random noise disturbance, ensures the precision of measurement, and can meet the requirement of response time.
The above-mentioned technical problem of the present invention is mainly what is be addressed by following technical proposals：
The processing method of gas concentration signal in a kind of Raman gas analyzer, it is characterised in that comprise the following steps that：
Step 1, original spectrum signal is obtained；
Step 2, the method based on addition method amplification gas concentration signal pre-processes to spectral signal；In order to reduce sound
Between seasonable, this stacking fold is less.
Step 3, each component gas concentration is calculated；
Step 4, judge whether high concentration signal is stablized, if unstable (wherein, fluctuation can be set to 1%~2%), then directly
Export each component gas concentration；If stable, after-treatment (the stacking fold root of low concentration spectral signal is carried out based on the addition method
Needed according to scene, can be 10 inferior), each component gas concentration is then recalculated, then export each component gas concentration.
The processing method of gas concentration signal in a kind of above-mentioned Raman gas analyzer, the step 2 calculate each group
When dividing gas concentration, it is necessary first to demarcated, then carry out gas concentration calculating, demarcation and gas concentration, which calculate, to be all based on
LR laser raman gas analyzer is carried out, and is specifically：
The demarcating steps of LR laser raman gas analyzer, it is specific as follows：
Step 1.1. is passed through volume ratio 4 in air inlet:6~6:4 scopes are calibrated gas and middle carrier gas, to be mixed
Gas is stable；
Step 1.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
Gas and the spectrogram of middle carrier gas are calibrated corresponding to the collection of step 1.3. spectrograms collector；
Step 1.4. data analysis modules are calibrated gas and the spectrogram obtained by middle carrier gas corresponding to, obtain one
Individual ratio constant
Wherein, VMark、VCarryRespectively it is calibrated the crest height of gas and middle carrier gas spectrum figure；nMark、nCarryRespectively marked
Determine the concentration of gas and middle carrier gas, and that obtained in spectrogram is VMark、VCarry, nMark、nCarryIt is known；
Step 1.5. changes the gas being calibrated, and repeat step 1~4, completes the corresponding demarcation of all known gas, establishes
One nominal data storehouse
The gas concentration detecting step includes two selection steps,
Select step 1：Contain the higher n+1 kind mixed gas of the middle carrier gas and middle carrier gas concentration that are used in demarcation
Concentration detecting step, this step is according to nominal data storehouse kMark i, the concentration of each gas composition can be calculated, it is dense to complete gas
The detection of degree, it is specific as follows：
Step 2.1. is passed through detection in air inlet and determines mixed gas and middle carrier gas, and gas to be mixed is stable；
Step 2.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
Gas and the spectrogram of middle carrier gas are calibrated corresponding to the collection of step 2.3. spectrograms collector；
Step 2.4. data analysis modules are calibrated gas and the spectrogram obtained by middle carrier gas corresponding to, obtain
VSurvey i、VCarry, according to nominal data Ku Ke get
Wherein, VSurvey i、VCarryThe crest height of a certain gas and middle carrier gas spectrum figure respectively in mixed gas；nSurvey i、
nCarryThe concentration of a certain gas and middle carrier gas respectively in mixed gas, and that obtained in spectrogram is VSurvey i、VCarry, kMark i
It is known in the nominal data storehouse obtained from demarcating steps；
Step 2.5. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nCarry=1, the concentration n of middle carrier gas can be calculatedCarry, so as to can also count
Calculate the concentration n of other gases in other n kind gaseous mixturesSurvey i；
Select step 2：Without the relatively low n+1 kind gaseous mixtures of the middle carrier gas or middle carrier gas concentration that are used in demarcation
Bulk concentration detecting step, this step is according to nominal data storehouse kMark i, you can the concentration of each gas composition is calculated, completes gas
The detection of concentration, it is specific as follows：
Step 3.1. is passed through detection in air inlet and determines mixed gas, and gas to be mixed is stable；
Step 3.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
The spectrogram Amplitude Ration that step 3.3. finds a kind of gas is larger, and carrier gas is measured using this gas as actual, it is determined as
(n+1)th kind of gas；
Gas and the spectrogram of actual measurement carrier gas are calibrated corresponding to the collection of step 3.4. spectrograms collector；
Step 3.5. data analysis modules are calibrated spectrogram of the gas obtained by with actual measurement carrier gas corresponding to, obtain
To VSurvey i、VSurvey (n+1), according to nominal data Ku Ke getWithBy
Obtain
Wherein, VSurvey i、VSurvey (n+1)The crest of a certain gas and actual measurement carrier gas spectrum figure respectively in mixed gas
Highly；nSurvey i、nSurvey (n+1)The concentration of a certain gas and actual measurement carrier gas respectively in mixed gas, and in spectrogram
To be VSurvey i、VSurvey (n+1), kMark i、kMark (n+1)It is known from the nominal data storehouse obtained from demarcating steps；
Step 3.6. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nSurvey (n+1)=1, the concentration n of actual measurement carrier gas can be calculatedSurvey (n+1),
So as to can also calculate the concentration n of other gases in other n kind gaseous mixturesSurvey i。
It should be noted that when calculating each component gas concentration, it is only necessary to once demarcated in step 3,
During the concentration of calculating again in step 4, it is not necessary to carry out the demarcation of gas.
Therefore, the invention has the advantages that：The influence of random noise disturbance can be not only effectively eliminated, ensures measurement
Precision, and the requirement of response time can be met.
Brief description of the drawings
Fig. 1 is the handling process schematic diagram of the present invention.
Embodiment
Below by embodiment, and with reference to accompanying drawing, technical scheme is described in further detail.
Embodiment：
The present invention's comprises the following steps that：
1) original spectrum signal is obtained；
2) spectral signal pre-processes, and spectral signal preprocess method refers to the method for addition method amplification gas concentration signal,
In order to reduce the response time, this stacking fold is less.
3) each component gas concentration is calculated；
4) judge whether high concentration signal is stablized, if unstable, directly export each component gas concentration；If stable,
The after-treatment of low concentration spectral signal is carried out, then recalculates each component gas concentration, then export each component gas concentration.
Wherein, the secondary treatment method of low concentration spectral signal refers to the method for addition method amplification gas concentration signal, is surveyed to improve
The precision of amount, this stacking fold are more.
In the present embodiment, each component gas concentration is calculated in step 3 and step 4 adopt and carry out in the following method：
Firstly the need of being demarcated, gas concentration calculating is then carried out, demarcation and gas concentration, which calculate, is all based on laser
Raman gas analyzer is carried out, and is specifically：
The demarcating steps of LR laser raman gas analyzer, it is specific as follows：
Step 1.1. is passed through volume ratio 4 in air inlet:6~6:4 scopes are calibrated gas and middle carrier gas, to be mixed
Gas is stable；
Step 1.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
Gas and the spectrogram of middle carrier gas are calibrated corresponding to the collection of step 1.3. spectrograms collector；
Step 1.4. data analysis modules are calibrated gas and the spectrogram obtained by middle carrier gas corresponding to, obtain one
Individual ratio constant
Wherein, VMark、VCarryRespectively it is calibrated the crest height of gas and middle carrier gas spectrum figure；nMark、nCarryRespectively marked
Determine the concentration of gas and middle carrier gas, and that obtained in spectrogram is VMark、VCarry, nMark、nCarryIt is known；
Step 1.5. changes the gas being calibrated, and repeat step 1~4, completes the corresponding demarcation of all known gas, establishes
One nominal data storehouse
The gas concentration detecting step includes two selection steps,
Select step 1：Contain the higher n+1 kind mixed gas of the middle carrier gas and middle carrier gas concentration that are used in demarcation
Concentration detecting step, this step is according to nominal data storehouse kMark i, the concentration of each gas composition can be calculated, it is dense to complete gas
The detection of degree, it is specific as follows：
Step 2.1. is passed through detection in air inlet and determines mixed gas and middle carrier gas, and gas to be mixed is stable；
Step 2.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
Gas and the spectrogram of middle carrier gas are calibrated corresponding to the collection of step 2.3. spectrograms collector；
Step 2.4. data analysis modules are calibrated gas and the spectrogram obtained by middle carrier gas corresponding to, obtain
VSurvey i、VCarry, according to nominal data Ku Ke get
Wherein, VSurvey i、VCarryThe crest height of a certain gas and middle carrier gas spectrum figure respectively in mixed gas；nSurvey i、
nCarryThe concentration of a certain gas and middle carrier gas respectively in mixed gas, and that obtained in spectrogram is VSurvey i、VCarry, kMark i
It is known in the nominal data storehouse obtained from demarcating steps；
Step 2.5. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nCarry=1, the concentration n of middle carrier gas can be calculatedCarry, so as to can also count
Calculate the concentration n of other gases in other n kind gaseous mixturesSurvey i；
Select step 2：Without the relatively low n+1 kind gaseous mixtures of the middle carrier gas or middle carrier gas concentration that are used in demarcation
Bulk concentration detecting step, this step is according to nominal data storehouse kMark i, you can the concentration of each gas composition is calculated, completes gas
The detection of concentration, it is specific as follows：
Step 3.1. is passed through detection in air inlet and determines mixed gas, and gas to be mixed is stable；
Step 3.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces
Spectrogram signal；
The spectrogram Amplitude Ration that step 3.3. finds a kind of gas is larger, and carrier gas is measured using this gas as actual, it is determined as
(n+1)th kind of gas；
Gas and the spectrogram of actual measurement carrier gas are calibrated corresponding to the collection of step 3.4. spectrograms collector；
Step 3.5. data analysis modules are calibrated spectrogram of the gas obtained by with actual measurement carrier gas corresponding to, obtain
To VSurvey i、VSurvey (n+1), according to nominal data Ku Ke getWithBy
Obtain
Wherein, VSurvey i、VSurvey (n+1)The crest of a certain gas and actual measurement carrier gas spectrum figure respectively in mixed gas
Highly；nSurvey i、nSurvey (n+1)The concentration of a certain gas and actual measurement carrier gas respectively in mixed gas, and in spectrogram
To be VSurvey i、VSurvey (n+1), kMark i、kMark (n+1)It is known from the nominal data storehouse obtained from demarcating steps；
Step 3.6. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nSurvey (n+1)=1, the concentration n of actual measurement carrier gas can be calculatedSurvey (n+1),
So as to can also calculate the concentration n of other gases in other n kind gaseous mixturesSurvey i。
It should be noted that when calculating each component gas concentration, it is only necessary to once demarcated in step 3,
During the concentration of calculating again in step 4, it is not necessary to carry out the demarcation of gas.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Claims (1)
1. the processing method of gas concentration signal in a kind of Raman gas analyzer, it is characterised in that comprise the following steps that：
Step 1, original spectrum signal is obtained；
Step 2, the method based on addition method amplification gas concentration signal pre-processes to spectral signal；
Step 3, each component gas concentration is calculated；
Step 4, judge whether high concentration signal is stablized, if unstable, directly export each component gas concentration；If stable,
The after-treatment of low concentration spectral signal is carried out based on the addition method, then recalculates each component gas concentration, then export each group
Divide gas concentration；
When the step 2 calculates each component gas concentration, it is necessary first to demarcated, then carry out gas concentration calculating, demarcation
Calculated with gas concentration and be all based on the progress of LR laser raman gas analyzer, be specifically：
The demarcating steps of LR laser raman gas analyzer, it is specific as follows：
Step 1.1. is passed through volume ratio 4 in air inlet:6~6:4 scopes are calibrated gas and middle carrier gas, and gas to be mixed is steady
It is fixed；
Step 1.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces spectrum
Figure signal；
Gas and the spectrogram of middle carrier gas are calibrated corresponding to the collection of step 1.3. spectrograms collector；
Step 1.4. data analysis modules are calibrated gas and the spectrogram obtained by middle carrier gas corresponding to, obtain a ratio
It is worth constant
Wherein, VMark、VCarryRespectively it is calibrated the crest height of gas and middle carrier gas spectrum figure；nMark、nCarryRespectively it is calibrated gas
Body and the concentration of middle carrier gas, and that obtained in spectrogram is VMark、VCarry, nMark、nCarryIt is known；
Step 1.5. changes the gas being calibrated, and repeat step 1~4, completes the corresponding demarcation of all known gas, establishes one
Nominal data storehouse
The gas concentration detecting step includes two selection steps,
Select step 1：Contain the higher n+1 kind mixed gas concentrations of the middle carrier gas and middle carrier gas concentration that are used in demarcation
Detecting step, this step is according to nominal data storehouse kMark i, the concentration of each gas composition can be calculated, completes gas concentration
Detection, it is specific as follows：
Step 2.1. is passed through mixed gas to be determined and middle carrier gas in air inlet, and gas to be mixed is stable；
Step 2.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces spectrum
Figure signal；
Mixed gas to be determined and the spectrogram of middle carrier gas corresponding to the collection of step 2.3. spectrograms collector；
Step 2.4. data analysis modules mixed gas to be determined and spectrogram obtained by middle carrier gas corresponding to, are obtained
VSurvey i、VCarry, according to nominal data Ku Ke get
Wherein, VSurvey i、VCarryThe crest height of a certain gas and middle carrier gas spectrum figure respectively in mixed gas；nSurvey i、nCarryPoint
A certain gas that Wei be in mixed gas and the concentration of middle carrier gas, and that obtained in spectrogram is VSurvey i、VCarry, kMark iFrom mark
Determine known in the nominal data storehouse that step obtains；
Step 2.5. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nCarry=1, the concentration n of middle carrier gas can be calculatedCarry, so as to can also calculate
The concentration n of other n kind gases in gaseous mixtureSurvey i；
Select step 2：It is dense without the relatively low n+1 kind mixed gas of the middle carrier gas or middle carrier gas concentration that are used in demarcation
Detecting step is spent, this step is according to nominal data storehouse kMark i, you can the concentration of each gas composition is calculated, completes gas concentration
Detection, it is specific as follows：
Step 3.1. is passed through mixed gas to be determined in air inlet, and gas to be mixed is stable；
Step 3.2. sends beam of laser after the gaseous mixture in demarcation/measurement air chamber by laser emission element, produces spectrum
Figure signal；
The spectrogram Amplitude Ration that step 3.3. finds a kind of gas is larger, measures carrier gas using this gas as actual, it is determined as (n+1)th
Kind gas；
The spectrogram of mixed gas corresponding to the collection of step 3.4. spectrograms collector；
Spectrogram obtained by step 3.5. data analysis modules mixed gas corresponding to, obtains VSurvey i、VSurvey (n+1), according to demarcation
Database can obtainWithBy
Obtain
Wherein, VSurvey i、VSurvey (n+1)The crest height of a certain gas and actual measurement carrier gas spectrum figure respectively in mixed gas；
nSurvey i、nSurvey (n+1)The concentration of a certain gas and actual measurement carrier gas respectively in mixed gas, and obtained in spectrogram
It is VSurvey i、VSurvey (n+1), kMark i、kMark (n+1)It is known from the nominal data storehouse obtained from demarcating steps；
Step 3.6. is by formula nSurvey 1+nSurvey 2+...+nSurvey n+nSurvey (n+1)=1, the concentration n of actual measurement carrier gas can be calculatedSurvey (n+1), so as to
Also the concentration n of other n kind gases in gaseous mixture can be calculatedSurvey i。
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| CN105486675B (en) * | 2015-12-29 | 2018-07-03 | 长安大学 | Quantitative analysis CO2The LR laser raman detection method of gas carbon isotope composition |
| CN105651757B (en) * | 2016-01-12 | 2018-07-03 | 长安大学 | A kind of measure CO2Gaseous carbon isotope value δ13The method of C |
| WO2019104487A1 (en) | 2017-11-28 | 2019-06-06 | 深圳达闼科技控股有限公司 | Mixture detection method and device |
| CN112213283B (en) * | 2020-09-15 | 2023-12-15 | 江苏方天电力技术有限公司 | Gas concentration measuring method |
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| US4784486A (en) * | 1987-10-06 | 1988-11-15 | Albion Instruments | Multi-channel molecular gas analysis by laser-activated Raman light scattering |
| JPH0572094A (en) * | 1991-09-10 | 1993-03-23 | Amenitec:Kk | Continuous measurement system for polution gas |
| CN1467492A (en) * | 2002-07-11 | 2004-01-14 | 中国科学院大连化学物理研究所 | Testing method and system for measuring gas component concentration using spontaneous Raman scattering technology |
| CN1598504A (en) * | 2004-08-27 | 2005-03-23 | 中国科学院长春光学精密机械与物理研究所 | Separating method of high-grade secondary superimposition spectrum of raster spectrograph |
| CN100456021C (en) * | 2006-03-24 | 2009-01-28 | 山西大学 | Technology and apparatus for detecting single-beam multi-wavelength mixed gas concentration in mine shaft |
| CN101846628B (en) * | 2009-03-27 | 2011-08-03 | 上海神开石油化工装备股份有限公司 | Method for performing online Raman spectral analysis on drilling fluid |
| CN101963577B (en) * | 2009-08-10 | 2012-07-04 | 重庆川仪自动化股份有限公司 | Method and system for measuring gas concentration |
| CN102590175B (en) * | 2012-02-21 | 2014-04-09 | 浙江大学 | Raman spectrum superposition-based method for quickly determining content of methanol in methanol gasoline |
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