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Calibration-free wavelength modulation spectroscopy gas detection method based on S[2f] method

A wavelength modulation spectrum and gas detection technology, applied in the field of laser spectroscopy, can solve the problems of many unknown parameters and low detection accuracy

Active Publication Date: 2016-03-02
山西博思通电子科技有限公司
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Problems solved by technology

[0016] In order to solve the current technical problem of the CF-WMS method used in gas concentration detection in the fitting process, the technical problem of low detection accuracy due to too many unknown parameters, the present invention provides a method based on S 2f Calibration-free wavelength modulation spectroscopic gas detection method

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  • Calibration-free wavelength modulation spectroscopy gas detection method based on S[2f] method
  • Calibration-free wavelength modulation spectroscopy gas detection method based on S[2f] method
  • Calibration-free wavelength modulation spectroscopy gas detection method based on S[2f] method

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[0042] The technology of the present invention will be further described below in conjunction with the accompanying drawings.

[0043] Such as figure 1 As shown, the 32Hz triangular scanning signal and the 10KHz sinusoidal modulation signal generated by the function generator 1 are added to the laser controller 3 by the adder 2 for scanning and modulating the output wavelength of the DFB laser 4 (NTT, NLK1L5EAAA). The modulated laser beam is divided into two parts by the beam splitter 5: one part enters the gas absorption cell 8 through the first collimating mirror 6, and is passed by the first photodetector 10 (PDs, Thorlabs, PDA10CS-EC) after interacting with the gas. detection, the other part enters the etalon 9 (0.02cm -1FSR), and then detected by the second photodetector 11 for wavelength calibration to obtain the variation of the wavelength with the triangular wave signal and the modulation signal respectively. where the wavelength change caused by the triangular wave...

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Abstract

The invention belongs to the technical field of laser spectroscopy, and mainly relates to a calibration-free wavelength modulation spectroscopy gas detection method based on an S[2f] method. Corresponding scientific analysis shows that A, i[1], i[2], concentration and phase difference psi[1] and psi[2] have little influence on S[2f] / S[2f]<c> signals, and only WMRF has obvious influence on the S[2f] / S[2f]<c> signals. Therefore, under conditions of uncertain concentration and phase shift, WMRF is obtained by inverting the S[2f] / S[2f]<c> signals, and because fitting parameters are greatly reduced, the method can be guaranteed to be simple, rapid and accurate. On the basis, the concentration of to-be-measured gas is fitted, and a measurement value with higher accuracy degree is obtained. The new method is simple, rapid and accurate, and is suitable for wide promotion in the field of gas detection.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, and mainly relates to a 2f A calibration-free wavelength modulation spectroscopic gas detection method. Background technique [0002] With the increasing air pollution, the public is paying more and more attention to air quality monitoring, and the detection of trace gases is becoming more and more important to human life. In the industrial field, accurate monitoring of trace gases can be used to regulate production processes, improve production efficiency and reduce pollutant emissions. At the same time, the detection of trace gases also plays an important role in the fields of biology, medicine, and agriculture. [0003] Tunable diode laser absorption spectroscopy (TDLAS) is a new type of trace gas detection technology, which has the characteristics of real-time online, non-invasive and high sensitivity, and is a mature application technology. Wavelength modulation spectroscopy (W...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
Inventor 马维光赵刚谭巍李志新尹王保肖连团贾锁堂
Owner 山西博思通电子科技有限公司
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