A tdlas line fitting method based on direct sum mode
A linear and mode technology, applied in the field of tunable diode absorption spectroscopy, can solve the problems of no analytical expression and the inability to solve the optimal combination of multiple influencing variables, so as to improve the accuracy of linear fitting and broaden the application range. Effect
Active Publication Date: 2021-11-30
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology
The invention can solve the problem that the Voigt linear function in the traditional convolution form has no analytical expression; solve the problem that the optimal combination of multiple influencing variables cannot be solved through a single absorption spectrum line
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Embodiment 1
[0043] Such as figure 1 As shown, a TDLAS line fitting method based on the direct sum mode disclosed in this embodiment, the specific implementation steps are as follows:
[0044] Step 1: If figure 2 As shown, the signal generator 1 is used to generate a sawtooth wave and input it to the laser controller 2, so that the DFB laser 3 is at the center frequency v 0 Scan nearby; the laser output from the laser 3 enters the coupler 4 through the optical fiber and is divided into two beams, one path passes through the etalon 6 and is received by the first detector 8; the other path enters the gas chamber 5 and is received by the second detector 9; And the second detector 9 converts the projected laser light into an electrical signal, which is collected by the data acquisition system 10 and sent to the upper computer data processing system;
[0045] Step 2: Perform 101-point second-order Savitzky-Golay filtering on the sampled discrete signal, and obtain the absorption spectrum cur...
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The invention discloses a TDLAS line shape fitting method based on a direct sum mode, which belongs to the technical field of tunable diode absorption spectroscopy (TDLAS). The present invention fits the absorption spectrum line type in TDLAS gas measurement through the straight-sum mode Voigt line type, and at the same time uses the genetic algorithm to search for the optimal value of multiple variables, and solves the optimal combination of multiple influencing variables through a single absorption line to obtain Absorption line shape in optimal TDLAS gas measurement. The invention can solve the problem that the Voigt linear function in the traditional convolution form has no analytical expression, and solve the problem that the optimal combination of multiple influencing variables cannot be solved through a single absorption spectrum line. The optimal TDLAS gas measurement absorption spectrum line shape obtained by the present invention is applied to related engineering fields to solve related technical problems. The related technical issues include improving the accuracy of TDLAS line shape fitting and applying it to the measurement of TDLAS gas temperature, component concentration and flow velocity. The invention can improve the accuracy of line type fitting and widen the application range of TDLAS technology.
Description
technical field [0001] The invention relates to a TDLAS line fitting method based on direct sum mode, in particular to a line fitting method which improves the line fitting accuracy and broadens the application range of TDLAS technology, and belongs to Tunable Diode Absorption Spectroscopy (TDLAS) technology field. Background technique [0002] Tunable diode laser absorption spectroscopy (TDLAS) has the advantages of non-invasiveness, high sensitivity and fast time response, and is widely used in the measurement of high-temperature gas temperature and component concentration. Correctly selecting the model of the spectral line shape and determining the line width are crucial to the accuracy of TDLAS measurement. With the development of laser spectroscopy, molecular spectral lines obtained from experiments are getting closer to real spectral types, making it possible to describe experimental spectral lines using line-type theoretical models based on the broadening mechanism. ...
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IPC IPC(8): G01N21/39G06F17/15G06N3/12
CPCG01N21/39G01N2021/394G06F17/15G06N3/126
Inventor 常海涛刘裕盛金振涛张学聪蔡静李春圆
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA