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A fitting method for extracting direct absorption lines in tdlas technique

A technology of absorption spectrum and absorption spectroscopy, which is applied in the field of optical fiber sensing, can solve difficult problems and achieve the effects of strong applicability, simple and effective implementation method, and improved detection accuracy and stability

Inactive Publication Date: 2021-05-28
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

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  • A fitting method for extracting direct absorption lines in tdlas technique
  • A fitting method for extracting direct absorption lines in tdlas technique
  • A fitting method for extracting direct absorption lines in tdlas technique

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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 present invention relates to a kind of fitting method that is used to extract the direct absorption spectral line in TDLAS technology, derives the expression function of gas absorption spectral line under the direct absorption spectrometry by Beer-Lambert's law, uses this function as nonlinear fitting The objective function of the algorithm selects part of the data of the measured signal, obtains the optimal undetermined coefficient of the objective function through the calculation of the algorithm, and restores the complete gas absorption spectrum. The invention restores a complete absorption spectrum line through a small number of data points, solves the problem of large errors in the calculation results of gas concentrations of different carrier gases at the same concentration, and improves detection precision and accuracy.

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 Patents(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