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Fitting method for extracting direct absorption line in TDLAS technology

A kind of absorption spectrum line and direct technology, applied in the direction of color/spectral characteristic measurement, etc., can solve difficult problems and achieve the effects of strong applicability, accurate calculation and improved measurement accuracy

Inactive Publication Date: 2019-04-02
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

[0006] The technical problem of the present invention is: to overcome the deficiencies of the prior art, to provide a fitting method for extracting the direct absorption spectrum in TDLAS technology, to restore the complete gas absorption spectrum through a small number of data points, and to solve the problem of different concentration It is difficult to calculate the gas concentration of different carrier gases, and improve the detection accuracy and accuracy

Method used

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  • Fitting method for extracting direct absorption line in TDLAS technology
  • Fitting method for extracting direct absorption line in TDLAS technology
  • Fitting method for extracting direct absorption line in TDLAS technology

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Embodiment Construction

[0046] The present invention will be further described below in conjunction with the examples.

[0047] Such as figure 1 , 2 As shown, the present invention selects methane as the measuring gas, selects different carrier gases under the same concentration as a comparative experiment, the first set of data is 2% methane and 98% nitrogen, the second set of data is 2% and 98% argon, the same The gas absorption spectrum lines of carrier gases with different concentrations are different, and the invention can calculate accurate concentration results.

[0048] Step 1. In this embodiment, direct absorption spectroscopy is used to measure two groups of gases, and two groups of data are extracted, with a total of 100 data points. The absorption lines are as follows: figure 2 Shown: The two sets of measured data are all methane with a concentration of 2%, but the carrier gases of the two are 98% nitrogen and 98% argon respectively, and the concave part in the curve is the nonlinear p...

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Abstract

The invention relates to a fitting method for extracting a direct absorption line in the TDLAS technology. On the basis of the Beer-Lambert law, an expression function of a gas absorption line under the direct absorption spectroscopy is deduced; partial data of an actually measuring signal are selected by using the function as an objective function of a nonlinear fitting algorithm; an optimized undetermined coefficient of the objective function is obtained based on calculation of the algorithm; and a complete gas absorption line is restored. According to the invention, the complete absorptionline is restored based on a few of data points; a problem of large error of the gas concentration calculation results of different carrier gas under the same concentration is solved; and the detectionprecision and accuracy are improved.

Description

technical field [0001] The invention relates to a fitting method for extracting direct absorption spectral lines in TDLAS technology, belonging to the technical field of optical fiber sensing. Background technique [0002] The monitoring of toxic and harmful gases has always been a research hotspot at home and abroad. In order to better protect people's lives and property and prevent major disasters, it is very important to build a fast and accurate online monitoring and early warning system. Nowadays, various Gas detection instruments and sensors have been greatly developed. Tunable diode laser absorption spectroscopy (TDLAS), as a branch of gas spectral detection technology, has high resolution, high sensitivity, low detection limit, less environmental impact and is suitable for various complex environments. Advantages, it plays a vital role in air pollution monitoring, aerospace technology, mine development, industrial manufacturing, biomedicine and other fields. After m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 陈昊鞠昱韩立常洋
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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