Method and appaatus for single-laser-sourceharmonic remote sensing gas detection

A technology for gas detection and single laser, applied in the field of spectral remote sensing monitoring, which can solve the problems of complex operation, large and complex equipment, and high price.

Inactive Publication Date: 2004-01-28
SHANXI UNIV
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Problems solved by technology

[0009] The present invention aims at the deficiencies in the existing spectral remote sensing monitoring technology, solves the problem of using double beams in the method, solves the problems of large and complex equipment, high price, and complicated operation in the equipment or device, and provides a new spectral remote sensing monitoring method ——A method for detecting gas by harmonic remote sensing with a single laser source and the equipment for realizing the method

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  • Method and appaatus for single-laser-sourceharmonic remote sensing gas detection
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  • Method and appaatus for single-laser-sourceharmonic remote sensing gas detection

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Embodiment Construction

[0051] method embodiment

[0052] In this embodiment, the detection of methane gas is taken as an example.

[0053] The method of single laser source harmonic remote sensing gas detection uses a sinusoidal signal of a certain frequency to modulate the laser emitted by a diode laser with the center frequency of the absorption peak of the gas to be detected as the detection light, which is detected by the angle after passing through the detected area. Natural target materials such as reflectors or walls are reflected (scattered), and the reflected (scattered) light is received by the receiving device and focused on a photodetector for photoelectric signal conversion. The converted electrical signal is sent by two phase-sensitive detectors. The detection of the first harmonic signal and the second harmonic signal is carried out respectively, where the reference signal frequency of the phase sensitive detector is consistent with the frequency of the sinusoidal modulation signal, a...

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Abstract

The detecting light is a laser light emitted from the laser diode possessing the central frequency of absorption peak of gas to be detected and modulated by a sinusoidal signal with assured frequency. With passing through the detected area, the detecting light is reflected (diffused) and focused on a photo detector, where electro-optical signal is converted. Two phase-sensitive detectors to detect first and second harmonic signals detect the converted electric signal. The frequency of the reference signal of the phase-sensitive detector is equal to the frequency of sinusoidal signal. The integral density along gas path in detecting area is determined by Cr=K (P2f / P1f), where K is determined from calibration experiment. The invention provides the features of high accuracy and sensitivity, easy of use and low cost.

Description

technical field [0001] The invention relates to spectrum remote sensing monitoring technology, in particular to a single laser source harmonic remote sensing gas detection method and equipment for realizing the method. Background technique [0002] Spectral remote sensing monitoring technology has the advantages of high sensitivity, high resolution, real-time and rapid monitoring. It can detect polluted gases in some inaccessible areas (such as chimneys, hazardous material distribution centers); it is especially useful for continuous monitoring or leak monitoring; it can measure pollutants in the troposphere and even above the stratosphere; no sampling gas is required, so no The accuracy of the sample gas is as concerned as the sampling measurement. Therefore, the large-scale continuous real-time monitoring method of spectral remote sensing monitoring technology will become an ideal tool for environmental pollution monitoring and industrial safety production monitoring. ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25
Inventor 贾锁堂尹王保马维光肖连团李昌勇赵建明
Owner SHANXI UNIV
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