CN104142299A - Pressure compensation method of infrared methane sensor - Google Patents
Pressure compensation method of infrared methane sensor Download PDFInfo
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- CN104142299A CN104142299A CN201310589653.3A CN201310589653A CN104142299A CN 104142299 A CN104142299 A CN 104142299A CN 201310589653 A CN201310589653 A CN 201310589653A CN 104142299 A CN104142299 A CN 104142299A
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- pressure
- concentration
- ratio
- methane sensor
- infrared methane
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Abstract
The invention relates to a pressure compensation method of an infrared methane sensor, aiming at solving the problem that the measured value difference is large in different pressure environments. According to the pressure compensation method, a compensation model is set, a pressure ratio of set pressure to actual pressure, a concentration ratio of set concentration to actual concentration and a relationship between the pressure ratio and the concentration ratio are reflected by the compensation model; model parameters are calculated by testing data for a plurality of times, so that model compensation is completed. During measurement, measured values are substituted into the compensation model to obtain a compensated actual concentration value.
Description
Technical field
The present invention relates to a kind of pressure compensating method of infrared methane sensor.
Background technology
Infrared methane sensor generally carries temperature compensation, but do not there is pressure compensation, therefore when not taking pressure compensation, the measured value of infrared methane sensor has larger difference under different pressures environment, for solving the larger problem of measurement of concetration error under different pressure environments, the present invention has designed the pressure compensating method of infrared methane sensor.
Summary of the invention
The pressure compensating method that the object of this invention is to provide a kind of infrared methane sensor, in order to solve the problem that under different pressures environment, measured value differs greatly.
For achieving the above object, the solution of the present invention comprises:
The pressure compensating method of infrared methane sensor, step is as follows:
1) infrared methane sensor is demarcated, and recorded the concentration value C of a kind of methane gas of infrared methane sensor
0with corresponding nominal pressure P
0;
2) adopt described methane gas, test being different under above-mentioned nominal pressure environment, the concentration value that each test record infrared methane sensor is measured and corresponding force value; Number of parameters-1 of the number of times≤compensation model of test;
3) described compensation model reflection, the ratio of the pressure that nominal pressure and actual pressure form, demarcates the ratio of the concentration that concentration and actual concentrations form, above-mentioned relation between the two; According to step 2) concentration value, the force value that obtain, and the demarcation concentration C that obtains of step 1)
0with nominal pressure P
0, obtain respectively the ratio of pressure and the ratio of concentration, substitution compensation model, the parameter of calculating compensation model.
When actual measurement, first read the actual measured value C of infrared methane sensor
cwith pressure measuring value P
p, according to step 3), obtain the ratio of pressure, bring the ratio C that compensation model is obtained concentration into, according to the actual measured value C of infrared methane sensor
c, calculate the concentration value after compensation.
Described compensation model is C=k
1p
2+ k
1p+k
3; In formula, C represents the ratio of concentration, and P represents the ratio of pressure, k
1, k
2and k
3for compensating parameter.
The ratio of described concentration is for demarcating concentration ratio actual concentrations, and the ratio of pressure is that nominal pressure compares actual pressure.
Pressure compensating method of the present invention, is mainly to set a compensation model, and the ratio of the pressure forming with this compensation model reflection nominal pressure and actual pressure is demarcated the ratio of the concentration that concentration and actual concentrations form, above-mentioned relation between the two; By test data repeatedly, calculate model parameter, complete compensation model.When measuring, measured value substitution compensation model can be obtained to the actual concentrations value after compensation.
Accompanying drawing explanation
Fig. 1 is compensation method schematic flow sheet;
Fig. 2 is the measuring method schematic flow sheet that adopts compensation.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
As shown in Figure 1, thinking of the present invention is:
1) infrared methane sensor is demarcated, recorded a kind of methane gas of infrared methane sensor concentration value C
0with corresponding nominal pressure P
0;
2) adopt described methane gas, test being different under above-mentioned nominal pressure environment, the concentration value of each test record infrared methane sensor and corresponding force value;
3) described compensation model reflection, the ratio of the pressure that nominal pressure and actual pressure form, demarcates the ratio of the concentration that concentration and actual concentrations form, above-mentioned relation between the two; According to step 2) concentration value, the force value that obtain, and the demarcation concentration C that obtains of step 1)
0with nominal pressure P
0, obtain respectively the ratio of pressure and the ratio of concentration, substitution compensation model, the parameter of calculating compensation model.
Concrete, in step 1), first according to the calibration request of infrared methane sensor, select suitable methane gas to demarcate it, normally 2 demarcation (except zero point), as 5%vol and two kinds of gas concentration of 50%vol, record a kind of methane gas, for example, select 50%vol gas, calibrated concentration value C
0with corresponding pressure value P
0.First demarcating steps guarantees sensor measurement accuracy at normal temperatures and pressures, again the parameter of now demarcating is applied to pressure compensation process simultaneously.
Test and determine compensation model parameter---carry out pressure compensation calibration curve.The gas of selecting carries out respectively pressure compensation calibration curve under the environment that is different from timing signal pressure, as pressure is respectively 30kPa and 60kPa(also can adopt respectively malleation and subnormal ambient, make model, be that curve effect is better), record respectively methane concentration value and force value (C under corresponding pressure
30and P
30, C
60and P
60).Take the ratio of pressure and the ratio of concentration is weight, and the ratio of pressure and the ratio of concentration are P
0/ P
0and C
0/ C
0,, P
0/ P
30and C
0/ C
30, P
0/ P
60and C
0/ C
60, be respectively 3 pairs of weights, 3 pairs of weights are brought into following formula and obtain each compensating parameter:
C=k
1P
2+k
1P+k
3
In formula, C represents concentration ratio, and P represents pressure ratio, k
1, k
2and k
3for compensating parameter.
As other embodiment, the ratio of pressure and the ratio of concentration also can be changed molecule denominator.Compensation model is binomial model, for make compensation more accurately or compensation model simpler, also can choose other binomial model, as three times or once.Should notice that compensation model changes while causing model parameter to change, corresponding increase and decrease testing time is to obtain the required data of calculating parameter.
When actual measurement, read the actual measured value C of infrared methane sensor
cwith pressure measuring value P
p, obtain P
0/ P
p, bring above formula into and obtain concentration ratio C, according to the actual measured value Cc of infrared methane sensor, calculate the concentration value C*Cc after compensation, realize methane concentration compensation.
More than provide a kind of concrete embodiment, but the present invention is not limited to described embodiment.Basic ideas of the present invention are such scheme, and for those of ordinary skills, according to instruction of the present invention, model, formula, the parameter of designing various distortion do not need to spend creative work.The variation of without departing from the principles and spirit of the present invention embodiment being carried out, modification, replacement and modification still fall within the scope of protection of the present invention.
Claims (4)
1. the pressure compensating method of infrared methane sensor, is characterized in that, step is as follows:
1) infrared methane sensor is demarcated, and recorded the concentration value C of a kind of methane gas of infrared methane sensor
0with corresponding nominal pressure P
0;
2) adopt described methane gas, test being different under above-mentioned nominal pressure environment, the concentration value that each test record infrared methane sensor is measured and corresponding force value; Number of parameters-1 of the number of times≤compensation model of test;
3) described compensation model reflection, the ratio of the pressure that nominal pressure and actual pressure form, demarcates the ratio of the concentration that concentration and actual concentrations form, above-mentioned relation between the two; According to step 2) concentration value, the force value that obtain, and the demarcation concentration C that obtains of step 1)
0with nominal pressure P
0, obtain respectively the ratio of pressure and the ratio of concentration, substitution compensation model, the parameter of calculating compensation model.
2. the pressure compensating method of infrared methane sensor according to claim 1, is characterized in that, when actual measurement, first reads the actual measured value C of infrared methane sensor
cwith pressure measuring value P
p, according to step 3), obtain the ratio of pressure, bring the ratio C that compensation model is obtained concentration into, according to the actual measured value C of infrared methane sensor
c, calculate the concentration value after compensation.
3. the pressure compensating method of infrared methane sensor according to claim 1, is characterized in that, described compensation model is C=k
1p
2+ k
1p+k
3; In formula, C represents the ratio of concentration, and P represents the ratio of pressure, k
1, k
2and k
3for compensating parameter.
4. the pressure compensating method of infrared methane sensor according to claim 3, is characterized in that, the ratio of described concentration is for demarcating concentration ratio actual concentrations, and the ratio of pressure is that nominal pressure compares actual pressure.
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|---|---|---|---|
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|---|---|---|---|
| CN201310589653.3A CN104142299A (en) | 2013-11-19 | 2013-11-19 | Pressure compensation method of infrared methane sensor |
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|---|---|
| CN104142299A true CN104142299A (en) | 2014-11-12 |
Family
ID=51851535
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|---|---|---|---|
| CN201310589653.3A Pending CN104142299A (en) | 2013-11-19 | 2013-11-19 | Pressure compensation method of infrared methane sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572191A (en) * | 2015-12-30 | 2016-05-11 | 郑州光力科技股份有限公司 | Pressure compensation method of electrochemical gas sensor |
| CN110988272A (en) * | 2019-12-27 | 2020-04-10 | 中国原子能科学研究院 | Method for correcting measured values of a hydrogen sensor |
| CN114487290A (en) * | 2022-01-14 | 2022-05-13 | 河南省日立信股份有限公司 | Gas sensor response curve fitting method with pressure compensation |
| CN115128027A (en) * | 2022-07-29 | 2022-09-30 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet differential spectrum gas sensor environment pressure compensation structure and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105572191A (en) * | 2015-12-30 | 2016-05-11 | 郑州光力科技股份有限公司 | Pressure compensation method of electrochemical gas sensor |
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| CN110988272A (en) * | 2019-12-27 | 2020-04-10 | 中国原子能科学研究院 | Method for correcting measured values of a hydrogen sensor |
| CN114487290A (en) * | 2022-01-14 | 2022-05-13 | 河南省日立信股份有限公司 | Gas sensor response curve fitting method with pressure compensation |
| CN115128027A (en) * | 2022-07-29 | 2022-09-30 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet differential spectrum gas sensor environment pressure compensation structure and method |
| CN115128027B (en) * | 2022-07-29 | 2023-09-19 | 中煤科工集团沈阳研究院有限公司 | Ultraviolet spectrum-splitting gas sensor environment pressure compensation structure and method |
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Application publication date: 20141112 |