Self-widening effect modification method in field of absorption spectrum gas sensation

A technology of gas sensing and absorption spectroscopy, which is applied in the field of gas sensing and can solve the problems of inaccurate and deviation of gas measurement to be measured

Active Publication Date: 2018-09-04
SHANDONG UNIV
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Problems solved by technology

[0003] The patentee is the Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and the inventors are Liu Wenqing, Tang Yuanyuan, etc. The invention patent "trace gas detection device and method based on mid-infrared quantum cascade laser direct absorption spectroscopy" involves the method (5) It is mentioned in the previous step that the peak value of the absorbance curve is used to invert the gas concentration, but the above-mentioned absorption method detection method has the following shortcomings, that is, the linear function is regarded as a constant when measuring t...

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  • Self-widening effect modification method in field of absorption spectrum gas sensation
  • Self-widening effect modification method in field of absorption spectrum gas sensation
  • Self-widening effect modification method in field of absorption spectrum gas sensation

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Embodiment

[0047] A correction method for the self-widening effect in the field of absorption spectrum gas sensing is realized by the following system, such as figure 1 As shown, the system includes temperature-controlled current source 1, DFB laser 2, fiber coupler 3, sampling gas chamber 4, reference gas chamber 5, photodetector a6, photodetector b7, current-to-voltage module 8, data acquisition card 9. Computer 10, temperature control current source 1 is connected to DFB laser 2. Temperature control current source 1 is divided into two parts: temperature control and driving current control. By controlling temperature and driving current, the frequency of DFB laser 2 output light is measured at the corresponding gas concentration. At the required center frequency; the output end of the DFB laser 2 is connected to the sampling gas chamber 4 and the reference gas chamber 5 through the fiber coupler 3, and the output laser enters the sampling gas chamber 4 and the reference gas chamber 4 an...

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Abstract

The invention discloses a self-widening effect modification method in the field of absorption spectrum gas sensation, that is, a method based on a Lambert-Beer absorption law and used for analyzing and detecting gas concentrations. The modification method for detecting gas concentrations by using an absorption spectrum analysis method on the basis that the influence of self-widening of a gas uponan absorption spectrum is sufficiently considered belongs to the field of gas sensation. According to the method, light absorbancy is not in a direct ratio relationship with a gas concentration and needs to be modified for a certain degree, in addition, the influence of self-widening of a gas upon line widths and light absorbancy needs to be taken as essential influence factors, and by adopting the method, the measurement precision of gas concentrations to be tested can be improved.

Description

Technical field [0001] The invention is based on the Lambert-Beer absorption law, and by fully considering the influence of the gas self-widening on the absorption spectrum, a correction method for detecting the gas concentration formed by the absorption spectrum analysis method relates to the technical field of gas sensing. Background technique [0002] With the development of high-pollution industries such as petroleum, chemical industry, and vehicles, the detection of toxic and harmful gases in exhaust gas has become increasingly important, and gas detection technology has become an indispensable technology. Absorption spectroscopy is currently a common method for detecting gas concentration. The direct absorption method has a wide range of applications in industrial fields because of its simple operation and direct measurement of gas concentration. [0003] The patentee is the Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, and the inventors are Liu ...

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Application Information

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IPC IPC(8): G01N21/39
Inventor 孙稼琛常军张秦端宫卫华
Owner SHANDONG UNIV
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