CN102128806A - Gas detection method used for infrared gas analyzer - Google Patents
Gas detection method used for infrared gas analyzer Download PDFInfo
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- CN102128806A CN102128806A CN2010106026562A CN201010602656A CN102128806A CN 102128806 A CN102128806 A CN 102128806A CN 2010106026562 A CN2010106026562 A CN 2010106026562A CN 201010602656 A CN201010602656 A CN 201010602656A CN 102128806 A CN102128806 A CN 102128806A
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Abstract
The invention discloses a gas detection method used for an infrared gas analyzer. The method comprises the following steps of: acquiring a flow difference signal measured by the infrared gas analyzer, and carrying out analog-to-digital conversion on the flow signal to obtain a digital flow difference signal; sequentially carrying out digital filtering, temperature compensating and pressure compensating on the flow difference signal to respectively eliminate interferences of interference component gases in a gas to be detected, ambient temperature and air pressure to obtain the flow difference signal; and carrying out nonlinear processing on the processed flow difference signal according to a Beer law, and calculating to obtain the concentration value of a measured component in the gas to be detected. By adopting the method disclosed by the invention, interferences of the interference component gases in the gas to be detected, the ambient temperature and the air pressure in the infrared gas analyzer can be effectively eliminated, drift error of hardware is compensated, and a high-accuracy concentration value of the measured component in the gas to be detected is obtained by calculation.
Description
Technical field
The present invention relates to infrared gas analyzer, relate in particular to the gas detection method that is used for this infrared gas analyzer.
Background technology
Because the vibration of majority of gas molecule and rotation spectrum is all at infrared band, when the vibration rotation feature frequency of the frequency of incident infrared radiation and molecule was identical, infrared radiation will be absorbed by gas molecule, causes the decay of radiation intensity.Infrared gas analyzer is exactly to utilize the principle that this gas molecule absorbs infrared radiation and make; has the measuring accuracy height; speed fast and can METHOD FOR CONTINUOUS DETERMINATION etc. characteristics; be widely used in the quality restriction of fields such as petrochemical complex, metallurgy, machining, pharmacy, biochemistry, environmental protection, quality monitoring, cement and auto industry (engine performance monitoring system), high-purity gas, also can be applied to the laboratory gas analysis.But, the concentration accuracy that measures at present object component in the tested gas that obtains according to the measured difference in flow calculated signals that obtains of infrared spectrum analyser is not high, this is because infrared gas analyzer measurement environment in measuring process may change, thereby make to produce drift error on the hardware, finally cause measurement result unreliable.
Summary of the invention
The objective of the invention is to provides a kind of gas detection method with high accuracy at the existing gas detection lower defective of accuracy as a result.
The embodiment of the invention is to realize like this.
A kind of gas detection method that is used for infrared gas analyzer may further comprise the steps:
Gather difference in flow signal that described infrared gas analyzer measures and it is carried out analog to digital conversion, obtain the difference in flow signal of numeral;
The flow difference signal is carried out digital filtering, temperature compensation, pressure compensation processing successively,, obtain the difference in flow signal to remove the interference of interference component gas, environment temperature and air pressure in the tested gas respectively;
According to Beer law, the difference in flow signal after handling is carried out Nonlinear Processing, calculate the concentration value that measures object component in the tested gas.
Wherein, the flow difference signal is being carried out digital filtering when handling, the mode that adopts the area to flow difference signal waveform repeatedly to add up realizes.
Wherein, to described difference in flow signal
The method of carrying out temperature compensation is as follows.
By being captured in the variation of the measurement data of infrared gas analyzer described in the variation of ambient temperature process, simulate the temperature compensation curve that measurement data changes corresponding variation of ambient temperature in advance.
In the actual measurement process, the testing environment variation of temperature compensates described difference in flow signal according to temperature compensation curve in real time.
Wherein, the method that described difference in flow signal is carried out atmospheric pressure compensating is as follows.
The variation of the measurement data by infrared gas analyzer described in the sample air chamber internal gas pressure change procedure that is captured in described infrared gas analyzer simulates the atmospheric pressure compensating curve that measurement data changes corresponding air pressure change in advance.
In the actual measurement process, the sample air chamber internal gas pressure that detects infrared gas analyzer in real time changes, and according to the atmospheric pressure compensating curve described difference in flow signal is compensated.
The embodiment of the invention compared with prior art, beneficial effect is:
1) the present invention has carried out digital filtering, temperature compensation and pressure compensation to the difference in flow signal that gas analyzer measures, can effectively remove the interference that interference component gas in the tested gas, environment temperature and infrared gas analyzer internal gas pressure change, compensated the drift error on the hardware, for the concentration value that measures object component in the tested gas that calculates high accuracy is laid a good foundation.
2) the present invention has adopted new area-method when digital filtering, can simple and directly remove random noise in the tested gas effectively to obtain actual signal, has further improved the accuracy of result of calculation.
Description of drawings
Fig. 1 is the gas detection method process flow diagram that is used for infrared gas analyzer in the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Infrared gas analyzer mainly comprises infrared light supply, sample air chamber, infrared detection chamber, sensor, sensing chamber and back sensing chamber before the infrared detection chamber comprises, before sensor is connected between sensing chamber and the back sensing chamber, and the series connection of sample air chamber and infrared detection chamber is positioned on the infrared light path direction of propagation of infrared light supply.
Its principle of work is: tested gas charges into the sample air chamber with certain flow rate from air intake opening, discharges from the gas outlet after the subband in the infrared light in the absorption sample air chamber; The infrared light of subband after by tested gas absorption enters the detecting device that is full of tested gas afterwards, produces difference in flow through the asymmetric absorption of front and back sensing chamber, catches this difference in flow signal by sensor.
The difference in flow signal that captures for sensor, because in the measuring process of infrared gas analyzer, air pressure change in interference component gas that is mingled with in unsettled environment temperature, the tested gas and the infrared gas analyzer all can have a negative impact to measuring process, thereby the present invention adopts following method to carry out analytical calculation, from the difference in flow signal that sensor captures, remove and disturb, restore original actual signal, and then finally calculate in the tested accurately gas concentration value that measures object component, as shown in Figure 1, specifically may further comprise the steps.
101, gather difference in flow signal that described infrared gas analyzer measures and it is carried out analog to digital conversion, obtain the difference in flow signal of numeral.
In this step, the difference in flow signal is after carrying out preliminary low-pass filtering and signal processing and amplifying through preposition modulate circuit, to enter high-precision modulus conversion chip and carry out analog to digital conversion, obtains the difference in flow signal of numeral.
102, the flow difference signal is carried out digital filtering and handle, to remove in the tested gas interference component gas to the interference of infrared gas analyzer in measuring process.
This step is specially: the difference in flow signal of numeral directly enters digital filter and carries out Fourier transform, obtains all fundamental components of signal, by removing the formed fundamental component of interference gas component in the signal, just can obtain more pure useful signal.
In this step, carrying out adopting area-method to realize when digital filtering is handled.Because random noise is Gaussian distribution, by repeatedly adding up to useful signal, just can effectively remove these random noises, present embodiment adopts area-method, repeatedly add up by area to the useful signal waveform, can further improve the cumulative effects of useful signal, therefore can succinct more influence of effectively removing random noise.
103, the flow difference signal is carried out temperature compensation and handle, to remove environment temperature to the interference of infrared gas analyzer in measuring process.
In this step, temperature compensation is handled and is mainly used to compensate infrared gas analyzer for the caused measuring error of variation of ambient temperature (drift), main method is: by gathering the variation of infrared gas analyzer measurement data in the variation of ambient temperature, simulate measurement data and change the compensated curve of corresponding variation of ambient temperature, in the actual measurement process, by real-time testing environment variation of temperature temperature compensation curve is compensated to the data of measurement, thereby effectively removed environment temperature the interference of infrared gas analyzer in measuring process.
104, the flow difference signal is carried out pressure compensation and handle, change the interference of infrared gas analyzer in measuring process to remove the infrared gas analyzer internal gas pressure.Pressure compensation handle and the temperature compensation disposal route similar, at disturbing factor be the variation of sample air chamber internal gas pressure.
105, according to Beer law, the difference in flow signal that obtains after digital filtering, temperature compensation and the pressure compensation processing is carried out Nonlinear Processing, calculate the concentration value that measures object component in the tested gas.
Because between difference in flow signal and the concentration is the nonlinear relationship of determining, therefore can calculate the concentration value of measurand composition eaily according to Beer law.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a gas detection method that is used for infrared gas analyzer is characterized in that, this method may further comprise the steps:
Gather difference in flow signal that described infrared gas analyzer measures and it is carried out analog to digital conversion, obtain the difference in flow signal of numeral;
The flow difference signal is carried out digital filtering, temperature compensation, pressure compensation processing successively,, obtain the difference in flow signal to remove the interference of interference component gas, environment temperature and air pressure in the tested gas respectively;
According to Beer law, the difference in flow signal after handling is carried out Nonlinear Processing, calculate the concentration value that measures object component in the tested gas.
2. the gas detection method that is used for infrared gas analyzer as claimed in claim 1 is characterized in that, the flow difference signal is being carried out digital filtering when handling, and the mode that adopts the area to flow difference signal waveform repeatedly to add up realizes.
3. the gas detection method that is used for infrared gas analyzer as claimed in claim 1 is characterized in that, the method for described difference in flow signal being carried out temperature compensation is:
By being captured in the variation of the measurement data of infrared gas analyzer described in the variation of ambient temperature process, simulate the temperature compensation curve that measurement data changes corresponding variation of ambient temperature in advance;
In the actual measurement process, the testing environment variation of temperature compensates described difference in flow signal according to temperature compensation curve in real time.
4. the gas detection method that is used for infrared gas analyzer as claimed in claim 1 is characterized in that, to described difference in flow signal
The method of carrying out atmospheric pressure compensating is:
The variation of the measurement data by infrared gas analyzer described in the sample air chamber internal gas pressure change procedure that is captured in described infrared gas analyzer simulates the atmospheric pressure compensating curve that measurement data changes corresponding air pressure change in advance;
In the actual measurement process, the sample air chamber internal gas pressure that detects infrared gas analyzer in real time changes, and according to the atmospheric pressure compensating curve described difference in flow signal is compensated.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142299A (en) * | 2013-11-19 | 2014-11-12 | 郑州光力科技股份有限公司 | Pressure compensation method of infrared methane sensor |
| CN106226262A (en) * | 2016-07-15 | 2016-12-14 | 西南石油大学 | A kind of gas concentration detecting system |
| CN106248584A (en) * | 2016-06-29 | 2016-12-21 | 深圳市怀睿科技有限公司 | A kind of method and system improving gas concentration accuracy of detection |
| CN115684076A (en) * | 2022-11-11 | 2023-02-03 | 中船重工安谱（湖北）仪器有限公司 | Data processing method of multi-channel infrared gas sensor |
| CN116973520A (en) * | 2023-09-21 | 2023-10-31 | 北京燕山时代仪表有限公司 | Anti-interference method, system, terminal and storage medium for gas concentration detector |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142299A (en) * | 2013-11-19 | 2014-11-12 | 郑州光力科技股份有限公司 | Pressure compensation method of infrared methane sensor |
| CN106248584A (en) * | 2016-06-29 | 2016-12-21 | 深圳市怀睿科技有限公司 | A kind of method and system improving gas concentration accuracy of detection |
| CN106226262A (en) * | 2016-07-15 | 2016-12-14 | 西南石油大学 | A kind of gas concentration detecting system |
| CN115684076A (en) * | 2022-11-11 | 2023-02-03 | 中船重工安谱（湖北）仪器有限公司 | Data processing method of multi-channel infrared gas sensor |
| CN115684076B (en) * | 2022-11-11 | 2024-01-30 | 中船重工安谱（湖北）仪器有限公司 | Multichannel infrared gas sensor data processing method |
| CN116973520A (en) * | 2023-09-21 | 2023-10-31 | 北京燕山时代仪表有限公司 | Anti-interference method, system, terminal and storage medium for gas concentration detector |
| CN116973520B (en) * | 2023-09-21 | 2024-01-05 | 北京燕山时代仪表有限公司 | Anti-interference method, system, terminal and storage medium for gas concentration detector |
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Application publication date: 20110720 |