TDLAS linear fitting method based on direct sum mode
A technology of line shape and pattern, applied in the field of tunable diode absorption spectrum, can solve the problems of no analytical expression and the inability to solve the optimal combination of multiple influencing variables, etc., so as to improve the accuracy of line shape fitting and broaden the scope of application Effect
Active Publication Date: 2019-11-08
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 laser 3 enters coupler 4 through optical fiber and is divided into two beams, one path passes through etalon 6 and is received by detector 8; the other path enters gas chamber 5 and is received by detector 9; detectors 8 and 9 convert the projected laser light The electrical signal is collected by the data acquisition system 10 and transmitted 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 curve after preprocessing such as least squares baseline ...
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The invention, which belongs to the technical field of tunable diode laser absorption spectroscopy (TDLAS), discloses a TDLAS linear fitting method based on a direct sum mode. According to the invention, Voigt linear fitting of an absorption line type in TDLAS gas measurement is performed by using a direct sum mode; on the basis of a genetic algorithm, a multi-variable optimal value is searched and optimal combination of a plurality of influence variables is calculated by using a single absorption line to obtain an optimal absorption line type in TDLAS gas measurement. Therefore, a problem ofbeing lack of analytical expression for a traditional convolutional type Voigt linear function is solved; and a problem that the optimal combination of a plurality of influence variables can not be calculated by using one single absorption line is solved. The optimal absorption line type in TDLAS gas measurement is applied to the relevant engineering fields to solve related technical problems including improving TDLAS line fitting accuracy and realizing application to TDLAS gas temperature, component concentration and flow rate measurement. Therefore, the linear fitting precision can be improved and the application range of the TDLAS technology can be extended.
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