Calibration-free gas parameter measurement method based on triangular wave modulation

A technology of gas parameter measurement and triangular wave, which is applied in the field of laser absorption spectroscopy, can solve the problem that the calibration-free gas concentration measurement method has not been published, and achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2017-09-29
SOUTHEAST UNIV
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However, the calibration-free gas concentration measurement me...

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  • Calibration-free gas parameter measurement method based on triangular wave modulation
  • Calibration-free gas parameter measurement method based on triangular wave modulation
  • Calibration-free gas parameter measurement method based on triangular wave modulation

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Embodiment Construction

[0046] The wavelength modulation method of the present invention will be described in further detail below with reference to the accompanying drawings.

[0047] The calibration-free gas concentration measurement method based on triangular wave modulation of the present invention is different from the traditional wavelength modulation method using sine wave modulation. The measurement method proposed by the present invention first superimposes a high-frequency triangular wave modulation signal on a low-frequency scanning signal, and feedbacks to the distribution type ( The wavelength of the DFB) laser is periodically tuned to obtain an absorption signal with a high signal-to-noise ratio. Then verify the calibration-free wavelength modulation spectrum model on the basis of triangle wave modulation, and determine the feasibility of the calibration-free gas concentration measurement method based on triangle wave modulation. Finally, the time-frequency response model of DFB laser unde...

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Abstract

The invention discloses a calibration-free gas parameter measurement method based on triangular wave modulation. The method comprises the following steps: superimposing a high-frequency triangular wave signal on a scanning signal and establishing a time-frequency response model of a DFB (Distributed Feedback) laser device based onfor such a modulation manner; simplifying a triangular wave modulation waveform into a form of superimposing a plurality of sine waves; extracting all parameters of the model through fitting an etalon signal. Based on the model, calibration-free measurement of gas concentration is realized. Compared with a traditional sine modulation manner, a modulation method provided by the invention can be used for remarkably improving the signal-to-noise ratio of a measurement system; furthermore, compared with other triangular wave modulation methods, the calibration-free gas parameter measurement method provided by the invention does not need to be used forhas no need of calibrating by utilizing standard gas and is more suitable for measurement of gas parameters under a severe environment.

Description

Technical field [0001] The invention relates to a calibration-free gas parameter measurement method based on triangular wave modulation, which is used for gas concentration measurement and belongs to the technical field of laser absorption spectroscopy. Background technique [0002] In recent years, with the development of semiconductor lasers, the use of narrow linewidth lasers for gas parameter measurement has become a trend, and absorption spectroscopy technology is one of the most representative ones. As early as the 1970s, tunable semiconductor laser absorption spectroscopy (TDLAS) technology was first proposed by Hinkley, Reid and others and applied to non-contact measurement of gas concentration. Subsequently, TDLAS technology developed rapidly and gradually developed in gas detection. And application. In the early stage of gas parameter measurement research, direct absorption spectroscopy technology has been widely used due to its intuitive and simple characteristics. D...

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Application Information

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IPC IPC(8): G01N21/39
CPCG01N21/39
Inventor 周宾汪步斌程禾尧张辉
Owner SOUTHEAST UNIV
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