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Sampling time delay distributed multi-point laser methane detection system and method

A methane detection and multi-point laser technology, which is applied in the measurement of color/spectral characteristics, etc., can solve problems such as large measurement deviation, and achieve the effect of high measurement accuracy and strong anti-interference ability.

Active Publication Date: 2019-06-21
CHINA COAL TECH ENG GRP CHONGQING RES INST
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Problems solved by technology

[0004] The purpose of the present invention is to provide a sampling time-delay distributed multi-point laser methane detection sys

Method used

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  • Sampling time delay distributed multi-point laser methane detection system and method
  • Sampling time delay distributed multi-point laser methane detection system and method
  • Sampling time delay distributed multi-point laser methane detection system and method

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Example Embodiment

[0028] Such as figure 1 The sample time-delay distributed multi-point laser methane detection system shown includes a laser emitting unit, an optical beam splitter, a photoelectric detection unit and a processor.

[0029] The laser emitting unit is used to provide laser light waves of a specific spectrum. The laser emitting unit includes a DFB laser for providing laser light and a DFB laser driving and temperature control system connected with the DFB laser for controlling the DFB laser to emit laser light waves of a specific spectrum. The center wavelength of the laser light wave of the specific spectrum is 1653.7 nm, and the scanning range is 1653.6 nm to 1653.8 nm.

[0030] The optical beam splitter is used to convert the laser light waves emitted by the laser emitting module into several light waves and then transmit them to different methane detection chambers. In this embodiment, the optical beam splitter can be converted into 8 light waves after passing through a 1 / 8 optica...

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Abstract

The invention discloses a sampling time delay distributed multi-point laser methane detection system and method. The method is characterized by converting a laser light wave with a specific spectrum into several beams of light waves, and then using a photoelectric detection unit to detect a light signal generated after the waves are absorbed by methane in each methane detection chamber and converting into an electrical signal, then, calculating and acquiring a sampling coefficient X of the electrical signal through a processor; when the sampling coefficient X is greater than or equal to 0.98,carrying out methane concentration calculation on the sampled electrical signal; when a cross-correlation coefficient X is less than 0.98, automatically delaying a sampling point for a sampling signalwaveform till that a correlation coefficient X obtained through carrying out cross-correlation processing on the corrected signal waveform and a driving signal is greater than or equal to 0.98; and finally, carrying out calculation processing on the electric signal after delay correction to obtain a methane gas concentration corresponding to the signal waveform sampled by each channel. In the invention, long-distance and wide-range multi-point detection can be realized, measurement accuracy is high and an anti-interference capability is high.

Description

technical field [0001] The invention relates to a sampling delay distributed multi-point laser methane detection system and method Background technique [0002] Traditional methane detection systems mainly use carrier catalysis, pyroelectric and infrared principles. The methane detection system based on the principle of carrier catalysis has problems such as being easily affected by other gases, narrow detection range, and poor stability; the methane detection system based on the pyroelectric principle has problems such as being greatly affected by ambient temperature, low detection accuracy, and poor stability; The infrared methane detection system has problems such as being easily interfered by alkane gas, greatly affected by water vapor, and poor stability. Compared with the traditional methane detection system, the methane detection system based on the laser principle has the advantages of high measurement sensitivity, good stability, and strong anti-interference, and i...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 龚仲强张书林李军孙世岭郭清华赵庆川梁光清张远征王尧
Owner CHINA COAL TECH ENG GRP CHONGQING RES INST
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