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WMRF new model-based calibration-free wavelength modulation spectrum gas detection method

A wavelength modulation spectroscopy and gas detection technology, applied in the field of laser spectroscopy, can solve the problem of low precision, and achieve the effects of convenient operation, easy cost and use, and simple technical scheme

Inactive Publication Date: 2016-03-09
山西镭谱光电科技有限公司
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Problems solved by technology

[0019] The present invention provides a calibration-free wavelength modulation spectrum gas detection method based on a new model of WMRF to solve the technical problem of low precision existing in the current calibration-free wavelength modulation spectroscopy technology (CF-WMS) used for gas concentration detection

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[0041] The technology of the present invention will be further described below in conjunction with the accompanying drawings.

[0042] 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 -1 FSR), 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, in particular relates to a WMRF new model-based calibration-free wavelength modulation spectrum gas detection method, and solves the technical problem of low precision of a calibration-free wavelength modulation spectrum technology currently used for gas concentration detection. An etalon of a 0.02 cm<-1> free spectral range is used to analyze wavelength change WMRF caused by signal modulation, a first harmonic component with the amplitude linearly changed and a second harmonic component with an amplitude as a constant are observed, and a new model for describing WMRF is described. By using the new model, a system can acquire a more accurate fitting result; compared with a conventional system, hardware module addition and manual operation are not needed, only program improvement is needed, and development and application are facilitated. The method is simple in technical scheme and convenient in operation, consumption of lots of manpower and material resources is not needed, and the cost and convenience degree in use are easily accepted by most application departments.

Description

technical field [0001] The invention belongs to the technical field of laser spectroscopy, in particular to a calibration-free wavelength modulation spectral gas detection method based on a new WMRF model. Background technique [0002] The increasingly serious air pollution has made the public pay more and more attention to air quality and environmental monitoring, and the detection of trace gases has become more and more important in human production and life. In rapidly developing industries, trace gas monitoring can be used to regulate production processes to reduce pollutant emissions and improve production efficiency. At the same time, the detection of trace gases can also be applied to pathological detection, agricultural cultivation and other aspects. [0003] Tunable diode laser absorption spectroscopy (TDLAS), as a new type of trace gas detection technology, has the characteristics of real-time online, non-invasive and high sensitivity, and has moved from the labor...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 马维光赵刚谭巍李志新尹王保肖连团贾锁堂
Owner 山西镭谱光电科技有限公司
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