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Single-light-source optical fiber photoacoustic gas sensing system and method

A photoacoustic gas and sensing system technology, applied in color/spectral characteristic measurement, material analysis through optical means, measurement devices, etc., can solve the problems of complex system structure and high demodulation cost, and achieve simplified system structure and reduced System cost, effect of high sensitivity

Active Publication Date: 2020-12-04
DALIAN UNIV OF TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to propose a single light source fiber optic photoacoustic gas sensing system and method, aiming to solve the problems of complex system structure and high demodulation cost commonly existing in the current fiber optic photoacoustic spectrum gas detection scheme, and provide a fiber optic photoacoustic gas sensing system. The application of detection technology expands more space

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Embodiment Construction

[0034] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.

[0035] A single light source optical fiber photoacoustic gas sensing system, comprising a single optical fiber miniature photoacoustic gas sensor device 1, a sensing fiber 2, a laser drive circuit 3, a laser 4, a fiber coupler 5, a photodetector 6, and a signal processing circuit 7 , a computer 8, an optical fiber collimator 9, a miniature gas sensing cavity 10, a sensing cavity housing 11 and an L-shaped cantilever beam 12. The laser drive circuit 3 and the laser 4 are integrated on one circuit board; the sensing fiber 2, the fiber coupler 5, and the fiber collimator 9 are directly connected by high-temperature fusion of an optical fiber fusion splicer to reduce coupling loss; the input light is collimated through the optical fiber After the device 9, it enters the micro gas sensing cavity 10 in the form of approxi...

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Abstract

The invention discloses a single-light-source optical fiber photoacoustic gas sensing system and method, and belongs to the technical field of optical fiber gas detection. The gas sensing system comprises a single-optical-fiber miniature photoacoustic gas sensing device, an optical fiber, a laser driving circuit, a laser, an optical fiber coupler, a photoelectric detector, a signal processing circuit and a computer. An L-shaped cantilever beam sensitive to sound waves and an optical fiber micro sensing structure are adopted, photoacoustic second harmonic signals generated when target gas absorbs laser light energy are converted into change of light intensity, and the concentration of the target gas can be monitored by measuring change of the light intensity of reflected light. According tothe scheme, a single tunable laser light source is adopted, and simultaneous excitation and detection of photoacoustic signals can be achieved. Compared with traditional optical fiber photoacoustic gas sensing, the system structure can be greatly simplified and the system cost can be reduced due to the fact that an additional signal detection light source is not needed. A competitive technical scheme for low-cost, rapid, high-sensitivity and long-distance gas leakage monitoring is provided.

Description

technical field [0001] The invention belongs to the technical field of optical fiber gas detection, and relates to a single light source optical fiber photoacoustic gas sensing system and method. Background technique [0002] Real-time monitoring of leaked gas plays an important early warning role for the safe use of household gas, and is also of great significance to the safe and stable operation of chemical plants, gas pipelines, and gas stations. Traditional electrical gas sensors may introduce additional hazards in flammable and explosive gas atmospheres, and are susceptible to electromagnetic interference around large electrical equipment. [0003] With the development of laser technology, absorption spectroscopy gas detection technology has become an excellent gas leakage monitoring solution. Absorption spectroscopy has the advantages of high sensitivity, good gas selectivity, long service life and fast response. According to the interaction mechanism between laser a...

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Application Information

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IPC IPC(8): G01N21/17G01N21/39
CPCG01N21/1702G01N21/39G01N2021/1704G01N2021/391
Inventor 陈珂郭珉马凤翔邱欣杰于清旭
Owner DALIAN UNIV OF TECH
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