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Method for measuring gas component concentration in inverse calculation mode based on differential optical absorption spectrum

A technique of differential absorption spectroscopy and gas composition, which is applied in the measurement of color/spectral characteristics, etc.

Inactive Publication Date: 2012-05-02
浙江微兰环境科技有限公司
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Problems solved by technology

[0029] In order to solve the problem of the precision of differential absorption spectroscopy (DOAS), the object of the invention is to provide a method for back calculation of gas component concentration based on differential absorption spectroscopy, which aims at the main factors that affect the accuracy of differential absorption spectroscopy (DOAS) A solution is proposed to solve the problem of the accuracy of the determination of the concentration of gas components with overlapping absorption lines

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  • Method for measuring gas component concentration in inverse calculation mode based on differential optical absorption spectrum
  • Method for measuring gas component concentration in inverse calculation mode based on differential optical absorption spectrum
  • Method for measuring gas component concentration in inverse calculation mode based on differential optical absorption spectrum

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Embodiment Construction

[0069] according to Figure 6 In the DOAS system of the flue, the light intensity emitted by the light source is The incident light is absorbed by the gas and scattered by the smoke particles, and the light intensity reaches the detection end after the gas is disturbed. According to the Lambert-Beer law:

[0070] (1)

[0071] Strength is After passing through the slit of the spectrometer, the light is received by the detection system that records the spectrum, and the shape of the diffraction spectrum changes due to the slit. This process is the convolution of the spectral signal and the instrument function H:

[0072] (2)

[0073] According to the resolution of the spectrometer, the detection system records the light intensity integral within a certain interval:

[0074] (3)

[0075] Due to the dual optical path structure used in the experiment designed in this paper, the ratio of the absorption optical pa...

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Abstract

The invention relates to a method for measuring gas component concentration in an inverse calculation mode based on a differential optical absorption spectrum. In the method for measuring the gas component concentration in the inverse calculation mode based on the differential optical absorption spectrum, a mathematic model is established and solved by a least square method, the contents of various pollutants in flue gas can be recorded in real time, and the gas which comprises unknown components can be determined. Meanwhile, the invention provides a solution scheme aiming at main factors which influence the precision of differential optical absorption spectroscopy (DOAS), analysis errors due to spectral line shift can be effectively reduced, and the precision problem of the gas component concentration measurement in which absorption spectral lines are superposed is solved.

Description

technical field [0001] The invention relates to a method for measuring the concentration of gas components with overlapping absorption lines. Background technique [0002] In the 1980s, Platt et al. promoted the application of differential absorption spectroscopy (DOAS) in the study of the tropospheric atmosphere. Since then, DOAS technology has developed rapidly, and many research institutions design instruments using DOAS technology according to their own research characteristics. These applications include air pollution monitoring, volcanic gas analysis of the troposphere, stratospheric gas composition monitoring, etc. [0003] By the end of the 1980s, DOAS technology was widely recognized as a means of gas detection. OPSIS determined the basic structure of the DOAS system, and other companies also launched their own commercial DOAS systems, and proposed many improvements in structure, hardware, and software algorithms. train of thought. In 1990, Axelson and others fir...

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Application Information

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IPC IPC(8): G01N21/31
Inventor 朱坚磊邵乐骥徐雷陈科龚真项震
Owner 浙江微兰环境科技有限公司