Method for correcting spectral shift in differential optical absorption spectroscopy (DOAS) measurement

A technology of differential absorption spectroscopy and drift correction, which is applied in the field of spectral drift correction, can solve problems such as interference, and achieve the effect of reducing the influence and eliminating the influence of the fitting result

Inactive Publication Date: 2012-06-13
浙江微兰环境科技有限公司
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Problems solved by technology

Otherwise, a small offset may cause a lot of interference when calculating

Method used

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  • Method for correcting spectral shift in differential optical absorption spectroscopy (DOAS) measurement
  • Method for correcting spectral shift in differential optical absorption spectroscopy (DOAS) measurement
  • Method for correcting spectral shift in differential optical absorption spectroscopy (DOAS) measurement

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Embodiment Construction

[0025] For the sake of typicality, a high-voltage flash xenon lamp with a large degree of change in the original signal is used as the light source, and the correlation calculation is performed on the obtained original lamp spectrum and the non-absorbing signal spectrum, and the result is as follows image 3 Shown:

[0026] The results show that for this optical system, there is a certain offset between the measured lamp spectrum and the measured signal spectrum, and the place where the correlation coefficient is the largest is the place where the lamp and the signal are most consistent. displacement.

[0027] In order to eliminate the influence of the offset on the differential absorption spectrum, the signal spectrum is offset-corrected. Since the spectral line offset may not be an integer multiple of the number of measurement channels, the correction needs to be interpolated. Through interpolation and resampling, the signal spectrum after the correction of the weak offset ...

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Abstract

The invention relates to a method for measuring gas components and in particular relates to a method for correcting spectral shift in differential optical absorption spectroscopy (DOAS) measurement for measuring gas components with DOAS. In order to eliminate influence of offset on the differential absorption spectrum, the signal spectrum is subjected to offset correction; since the offset of the spectral line is possibly not the integer multiples of the measurement channel number, interpolation is required in the correction; and through interpolation re-sampling, the corrected signal spectrum after slight offset can be obtained. By adopting the method, the influence of the offset of the spectral line on the absorption spectrum is obviously reduced, and the influence on the fitting result of the final DOAS calculation is basically eliminated.

Description

technical field [0001] The invention relates to a method for measuring gas components, in particular to a method for correcting spectral drift in differential absorption spectrum measurement of gas components using DOAS. 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, hardwar...

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Application Information

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Patent Type & Authority Applications(China)
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
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