Interference correction and concentration inversion method of multi-component gas analysis

A gas analysis and interference correction technology, applied in the measurement of color/spectral characteristics, etc., can solve problems such as detection accuracy and sensitivity reduction, and achieve the effect of correcting water vapor interference, improving measurement accuracy, and eliminating system drift.

Inactive Publication Date: 2011-09-14
ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for interference correction and concentration inversion of multi-component gas analysis, so as to solve the problem that the existing technology is susceptible to interference and causes the detection accuracy and sensitivity to decrease

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  • Interference correction and concentration inversion method of multi-component gas analysis
  • Interference correction and concentration inversion method of multi-component gas analysis
  • Interference correction and concentration inversion method of multi-component gas analysis

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Embodiment Construction

[0027] Such as Figure 1 ~ Figure 3 shown. In the present invention, there is no gas absorption or absorption in the filter bandwidth of the reference filter channel, and the signal fluctuation (such as: light source aging, voltage fluctuation, dust scattering, etc.) caused by external interference at any time has the same amplitude as the target gas filter The channels are the same, and the interference caused by external fluctuations is corrected by using the signal of the reference filter channel.

[0028] The present invention uses the absorbance of different frequency bands to invert the concentration of different gases, for example: to invert CH with a filter channel whose central transmission wavelength is 3.26 μm 4 The concentration of CO is retrieved by the filter channel with a central transmission wavelength of 4.63 μm; the concentration of NO is retrieved by a filter channel with a central transmission wavelength of 5.21 μm; the concentration of NO is retrieved by...

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Abstract

The invention discloses an interference correction and concentration inversion method of multi-component gas analysis, which comprises the following steps: a reference filter channel is used for eliminating the system drifting because of external factors; the water vapor is utilized to correct the interference of the water vapor of an analysis meter in the service environment on the interference functions of the other filter channels; the cross-correlation functions are utilized to obtain the pure absorbance of various target gases in the mixed gas by establishing and solving a multivariable interference equation set, and the cross interference among the target gas is corrected; and after the interference is corrected, the response functions of each filter channel are utilized to inverse the concentration of the target gas. After a simple non-dispersion infrared analysis meter utilizes the interference correction and concentration inversion method provided by the invention, a detectoris used for simultaneously and accurately detecting the concentration of various polluted gases such as CO2, CO, NO, NO2, SO2, CH4, N2O, HC, H2O, NH3, H2S and the like.

Description

technical field [0001] The invention relates to the field of optical measurement of multi-component gas concentration, in particular to an interference correction and concentration inversion method for multi-component gas analysis. Background technique [0002] Some links in industrial production, such as production equipment or production sites used in raw material production, processing, combustion, heating and cooling, and product finishing, may become sources of industrial pollution. SO 2 , NO 2 , NO, CO and CO 2 As an important part of flue gas emissions, it will not only damage the atmospheric environment and endanger human health, but also one of the important causes of urban smog, reduce urban visibility, destroy the earth's radiation balance, and affect the global climate. Effectively measuring the concentration of various component gases in flue gas is a prerequisite for controlling the emission of pollution sources. [0003] Non-dispersive infrared (NDIR) spec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 刘文清孙友文谢品华汪世美黄书华王亚萍陈军于晓曼陆亦怀
Owner ANHUI INST OF OPTICS & FINE MECHANICS - CHINESE ACAD OF SCI
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