CN104267018A - Method for processing gas concentration signal in Raman gas analyzer - Google Patents
Method for processing gas concentration signal in Raman gas analyzer Download PDFInfo
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- CN104267018A CN104267018A CN201410583555.3A CN201410583555A CN104267018A CN 104267018 A CN104267018 A CN 104267018A CN 201410583555 A CN201410583555 A CN 201410583555A CN 104267018 A CN104267018 A CN 104267018A
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Abstract
The invention discloses a method for processing a gas concentration signal in a Raman gas analyzer and relates to a signal processing method, in particular to the method for processing the gas concentration signal in the Raman gas analyzer. The method comprises the following specific steps: 1, acquiring an initial spectral signal; 2, preprocessing the spectral signal; 3, calculating gas concentration of each component; 4, judging whether a high-concentration signal is stable, directly outputting the gas concentration of each component if the high-concentration signal is instable, and if the high-concentration signal is stable, carrying out secondary processing on a low-concentration spectral signal, then recalculating the gas concentration of each component and outputting the gas concentration of each component. The method disclosed by the invention not only can effectively eliminate influence of random noise interference and ensures accuracy of measurement, but also can meet the requirement for response time.
Description
Technical field
The present invention relates to signal processing method, particularly the disposal route of gas concentration signal in a kind of Raman gas analyser.
Background technology
In laser raman gas analyzer, in order to ensure the precision measured, can process measured gas concentration signal, the method for process is that stacking method amplifies gas concentration signal, but these all need to sacrifice the response time for cost.The present invention is exactly the contradiction solved between the measuring accuracy of instrument and response time.
Summary of the invention
The present invention mainly solves the technical matters existing for prior art; Provide a kind of not only can the impact of effective Removing Random No interference, ensure the precision measured, and the requirement of response time can be met.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:
In Raman gas analyser, a disposal route for gas concentration signal, is characterized in that, concrete steps are as follows:
Step 1, obtains original spectrum signal;
Step 2, the method for amplifying gas concentration signal based on method of superposition carries out pre-service to spectral signal; In order to reduce the response time, this stacking fold is less.
Step 3, calculates each component gas concentration;
Step 4, judges whether high concentration signal is stablized, if unstable (wherein, fluctuation can be set to 1% ~ 2%), then directly exports each component gas concentration; If stable, then carry out the secondary treating (stacking fold according to on-the-spot needs, can be 10 inferior) of low concentration spectral signal based on method of superposition, then recalculate each component gas concentration, then export each component gas concentration.
The disposal route of gas concentration signal in above-mentioned a kind of Raman gas analyser, when described step 2 calculates each component gas concentration, first need to demarcate, then carry out gas concentration calculating, it is all carry out based on laser raman gas analyzer that demarcation and gas concentration calculate, specifically:
The demarcating steps of laser raman gas analyzer, specific as follows:
Step 1.1. air intake opening pass into volume ratio in 4:6 ~ 6:4 scope by marked gas and middle carrier gas, gas to be mixed stablize;
Step 1.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 1.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 1.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain a ratio constant
Wherein, V
mark, V
carrybe respectively the crest height by marked gas and middle carrier gas spectrum figure; n
mark, n
carrybe respectively the concentration by marked gas and middle carrier gas, and that obtain in spectrogram is V
mark, V
carry, n
mark, n
carryknown;
Step 1.5. changes by the gas demarcated, and repeats step 1 ~ 4, and the correspondence completing all known gas is demarcated, and sets up a nominal data storehouse
Described gas concentration detecting step comprises two and selects step,
Select step one: containing the middle carrier gas used in demarcating and the higher n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 2.1. passes into detect at air intake opening and determines mixed gas and middle carrier gas, and gas to be mixed is stablized;
Step 2.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 2.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 2.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain V
survey i, V
carry, according to nominal data Ku Ke get
?
Wherein, V
survey i, V
carrybe respectively the crest height of a certain gas in mixed gas and middle carrier gas spectrum figure; n
survey i, n
carrybe respectively the concentration of a certain gas in mixed gas and middle carrier gas, and that obtain in spectrogram is V
survey i, V
carry, k
mark iknown from the nominal data storehouse that demarcating steps obtains;
Step 2.5. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
carry=1, the concentration n of middle carrier gas can be calculated
carry, thus also can calculate the concentration n of other gases in other n kind combination gass
survey i;
Select step 2: containing the middle carrier gas used in demarcating or the lower n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 3.1. passes into detect at air intake opening and determines mixed gas, and gas to be mixed is stablized;
Step 3.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 3.3. finds a kind of spectrogram amplitude com parison of gas large, using this gas as actual measurement carrier gas, is decided to be (n+1)th kind of gas;
Step 3.4. spectrogram collector gathers corresponding to the spectrogram of marked gas and actual measurement carrier gas;
Step 3.5. data analysis module according to correspondence by the spectrogram of marked gas and actual measurement carrier gas gained, obtain V
survey i, V
survey (n+1), according to nominal data Ku Ke get
with
by
Obtain
Wherein, V
survey i, V
survey (n+1)be respectively the crest height of a certain gas in mixed gas and actual measurement carrier gas spectrum figure; n
survey i, n
survey (n+1)be respectively the concentration of a certain gas in mixed gas and actual measurement carrier gas, and that obtain in spectrogram is V
survey i, V
survey (n+1), k
mark i, k
mark (n+1)known from the nominal data storehouse obtained from demarcating steps;
Step 3.6. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
survey (n+1)=1, the concentration n of actual measurement carrier gas can be calculated
survey (n+1), thus also can calculate the concentration n of other gases in other n kind combination gass
survey i.
It should be noted that when calculating each component gas concentration, only need once to demarcate in step 3, during calculating concentration again in step 4, do not need the demarcation carrying out gas.
Therefore, tool of the present invention has the following advantages: not only can the impact of effective Removing Random No interference, ensures the precision measured, and can meet the requirement of response time.
Accompanying drawing explanation
Fig. 1 is treatment scheme schematic diagram of the present invention.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment:
Concrete steps of the present invention are as follows:
1) original spectrum signal is obtained;
2) spectral signal pre-service, spectral signal preprocess method refers to that method of superposition amplifies the method for gas concentration signal, and 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, then directly export each component gas concentration; If stable, then carry out the secondary treating of low concentration spectral signal, then recalculate each component gas concentration, then export each component gas concentration.Wherein, the secondary treatment method of low concentration spectral signal refers to that method of superposition amplifies the method for gas concentration signal, and in order to improve the precision of measurement, this stacking fold is more.
In the present embodiment, calculate each component gas concentration in step 3 and step 4 to adopt and carry out in the following method:
First need to demarcate, then carry out gas concentration calculating, it is all carry out based on laser raman gas analyzer that demarcation and gas concentration calculate, specifically:
The demarcating steps of laser raman gas analyzer, specific as follows:
Step 1.1. air intake opening pass into volume ratio in 4:6 ~ 6:4 scope by marked gas and middle carrier gas, gas to be mixed stablize;
Step 1.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 1.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 1.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain a ratio constant
Wherein, V
mark, V
carrybe respectively the crest height by marked gas and middle carrier gas spectrum figure; n
mark, n
carrybe respectively the concentration by marked gas and middle carrier gas, and that obtain in spectrogram is V
mark, V
carry, n
mark, n
carryknown;
Step 1.5. changes by the gas demarcated, and repeats step 1 ~ 4, and the correspondence completing all known gas is demarcated, and sets up a nominal data storehouse
Described gas concentration detecting step comprises two and selects step,
Select step one: containing the middle carrier gas used in demarcating and the higher n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 2.1. passes into detect at air intake opening and determines mixed gas and middle carrier gas, and gas to be mixed is stablized;
Step 2.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 2.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 2.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain V
survey i, V
carry, according to nominal data Ku Ke get
?
Wherein, V
survey i, V
carrybe respectively the crest height of a certain gas in mixed gas and middle carrier gas spectrum figure; n
survey i, n
carrybe respectively the concentration of a certain gas in mixed gas and middle carrier gas, and that obtain in spectrogram is V
survey i, V
carry, k
mark iknown from the nominal data storehouse that demarcating steps obtains;
Step 2.5. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
carry=1, the concentration n of middle carrier gas can be calculated
carry, thus also can calculate the concentration n of other gases in other n kind combination gass
survey i;
Select step 2: containing the middle carrier gas used in demarcating or the lower n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 3.1. passes into detect at air intake opening and determines mixed gas, and gas to be mixed is stablized;
Step 3.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 3.3. finds a kind of spectrogram amplitude com parison of gas large, using this gas as actual measurement carrier gas, is decided to be (n+1)th kind of gas;
Step 3.4. spectrogram collector gathers corresponding to the spectrogram of marked gas and actual measurement carrier gas;
Step 3.5. data analysis module according to correspondence by the spectrogram of marked gas and actual measurement carrier gas gained, obtain V
survey i, V
survey (n+1), according to nominal data Ku Ke get
with
by
Obtain
Wherein, V
survey i, V
survey (n+1)be respectively the crest height of a certain gas in mixed gas and actual measurement carrier gas spectrum figure; n
survey i, n
survey (n+1)be respectively the concentration of a certain gas in mixed gas and actual measurement carrier gas, and that obtain in spectrogram is V
survey i, V
survey (n+1), k
mark i, k
mark (n+1)known from the nominal data storehouse obtained from demarcating steps;
Step 3.6. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
survey (n+1)=1, the concentration n of actual measurement carrier gas can be calculated
survey (n+1), thus also can calculate the concentration n of other gases in other n kind combination gass
survey i.
It should be noted that when calculating each component gas concentration, only need once to demarcate in step 3, during calculating concentration again in step 4, do not need the demarcation carrying out gas.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Claims (2)
1. the disposal route of gas concentration signal in Raman gas analyser, it is characterized in that, concrete steps are as follows:
Step 1, obtains original spectrum signal;
Step 2, the method for amplifying gas concentration signal based on method of superposition carries out pre-service to spectral signal;
Step 3, calculates each component gas concentration;
Step 4, judges whether high concentration signal is stablized, if unstable, then directly exports each component gas concentration; If stable, then carry out the secondary treating of low concentration spectral signal based on method of superposition, then recalculate each component gas concentration, then export each component gas concentration.
2. the disposal route of gas concentration signal in a kind of Raman gas analyser according to claim 1, it is characterized in that, when described step 2 calculates each component gas concentration, first need to demarcate, then gas concentration calculating is carried out, it is all carry out based on laser raman gas analyzer that demarcation and gas concentration calculate, specifically:
The demarcating steps of laser raman gas analyzer, specific as follows:
Step 1.1. air intake opening pass into volume ratio in 4:6 ~ 6:4 scope by marked gas and middle carrier gas, gas to be mixed stablize;
Step 1.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 1.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 1.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain a ratio constant
Wherein, V
mark, V
carrybe respectively the crest height by marked gas and middle carrier gas spectrum figure; n
mark, n
carrybe respectively the concentration by marked gas and middle carrier gas, and that obtain in spectrogram is V
mark, V
carry, n
mark, n
carryknown;
Step 1.5. changes by the gas demarcated, and repeats step 1 ~ 4, and the correspondence completing all known gas is demarcated, and sets up a nominal data storehouse
Described gas concentration detecting step comprises two and selects step,
Select step one: containing the middle carrier gas used in demarcating and the higher n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 2.1. passes into detect at air intake opening and determines mixed gas and middle carrier gas, and gas to be mixed is stablized;
Step 2.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 2.3. spectrogram collector gathers corresponding to the spectrogram of marked gas and middle carrier gas;
Step 2.4. data analysis module according to correspondence by the spectrogram of marked gas and middle carrier gas gained, obtain V
survey i, V
carry, according to nominal data Ku Ke get
?
Wherein, V
survey i, V
carrybe respectively the crest height of a certain gas in mixed gas and middle carrier gas spectrum figure; n
survey i, n
carrybe respectively the concentration of a certain gas in mixed gas and middle carrier gas, and that obtain in spectrogram is V
survey i, V
carry, k
mark iknown from the nominal data storehouse that demarcating steps obtains;
Step 2.5. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
carry=1, the concentration n of middle carrier gas can be calculated
carry, thus also can calculate the concentration n of other gases in other n kind combination gass
survey i;
Select step 2: containing the middle carrier gas used in demarcating or the lower n+1 kind mixed gas concentration detecting step of middle carrier gas concentration, this step is according to nominal data storehouse k
mark i, the concentration of each gas composition can be calculated, complete the detection of gas concentration, specific as follows:
Step 3.1. passes into detect at air intake opening and determines mixed gas, and gas to be mixed is stablized;
Step 3.2. sends beam of laser after demarcating/measure the combination gas in air chamber by laser emission element, produces spectrogram signal;
Step 3.3. finds a kind of spectrogram amplitude com parison of gas large, using this gas as actual measurement carrier gas, is decided to be (n+1)th kind of gas;
Step 3.4. spectrogram collector gathers corresponding to the spectrogram of marked gas and actual measurement carrier gas;
Step 3.5. data analysis module according to correspondence by the spectrogram of marked gas and actual measurement carrier gas gained, obtain V
survey i, V
survey (n+1), according to nominal data Ku Ke get
with
by
obtain
Wherein, V
survey i, V
survey (n+1)be respectively the crest height of a certain gas in mixed gas and actual measurement carrier gas spectrum figure; n
survey i, n
survey (n+1)be respectively the concentration of a certain gas in mixed gas and actual measurement carrier gas, and that obtain in spectrogram is V
survey i, V
survey (n+1), k
mark i, k
mark (n+1)known from the nominal data storehouse obtained from demarcating steps;
Step 3.6. is by formula n
survey 1+ n
survey 2+ ...+n
survey n+ n
survey(
n+1)=1, can calculate the concentration n of actual measurement carrier gas
survey (n+1), thus also can calculate the concentration n of other gases in other n kind combination gass
survey i.
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| CN105651757A (en) * | 2016-01-12 | 2016-06-08 | 长安大学 | Method for measuring carbon isotope value delta13C of CO2 gas |
| CN108124462A (en) * | 2017-11-28 | 2018-06-05 | 深圳达闼科技控股有限公司 | A kind of mixing object detecting method and equipment |
| CN112213283A (en) * | 2020-09-15 | 2021-01-12 | 江苏方天电力技术有限公司 | Gas concentration measuring method |
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| CN105651757A (en) * | 2016-01-12 | 2016-06-08 | 长安大学 | Method for measuring carbon isotope value delta13C of CO2 gas |
| CN105651757B (en) * | 2016-01-12 | 2018-07-03 | 长安大学 | A kind of measure CO2Gaseous carbon isotope value δ13The method of C |
| CN108124462A (en) * | 2017-11-28 | 2018-06-05 | 深圳达闼科技控股有限公司 | A kind of mixing object detecting method and equipment |
| US10801951B2 (en) | 2017-11-28 | 2020-10-13 | Cloudminds (Shenzhen) Holdings Co., Ltd. | Mixture detection method and device |
| CN108124462B (en) * | 2017-11-28 | 2020-11-17 | 深圳达闼科技控股有限公司 | Mixture detection method and device |
| CN112213283A (en) * | 2020-09-15 | 2021-01-12 | 江苏方天电力技术有限公司 | Gas concentration measuring method |
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