Optical fiber tip photoacoustic gas sensing system and method
A technology of photoacoustic gas and sensing system, which is applied in the direction of material analysis, phase influence characteristic measurement and instrumentation through optical means, which can solve the problems of large volume, poor anti-electromagnetic interference ability and complex system, and achieve small probe volume , Intrinsically safe, and the effect of simplifying the system structure
Active Publication Date: 2022-05-13
DALIAN UNIV OF TECH
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Problems solved by technology
It can effectively solve the ubiquitous problems of large volume, complex system, and poor anti-electromagnetic interference ability of methane gas sensors, and further expand the application of optical fiber photoacoustic sensing technology in environments with electromagnetic interference or narrow pipelines.
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[0041] The specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions and accompanying drawings.
[0042] A fiber optic tip photoacoustic gas sensing system, mainly including a narrow linewidth laser light source 1, a wide-spectrum detection light source 2, a wavelength division multiplexer 3, an optical circulator 4, a spectrometer 5, a computer 6, a single-mode fiber 7 and Optical fiber tip photoacoustic sensing probe8. The laser light emitted by the narrow-linewidth laser source 1 is transmitted in the single-mode optical fiber 7 through the wavelength division multiplexer 3, enters the fiber tip photoacoustic sensing probe 8, and excites the gas to generate the photoacoustic effect; the wide-spectrum detection light source 2 emits a wide The spectral light passes through the optical circulator 4, the wavelength division multiplexer 3 and the single-mode optical fiber 7 successively, enters the optical fiber t...
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Abstract
The invention provides an optical fiber tip photoacoustic gas sensing system and method, belonging to the technical field of optical trace gas detection. The gas sensing system includes a narrow-linewidth laser light source, a wide-spectrum detection light source, a wavelength division multiplexer, an optical circulator, a spectrometer, a computer, a single-mode optical fiber, and a fiber-optic tip photoacoustic sensing probe. The narrow-linewidth laser and the broad-spectrum probe light are coupled by a wavelength division multiplexer and simultaneously transmitted to the fiber-optic tip photoacoustic sensing probe through a single optical fiber. A common gas cavity is used as a photoacoustic gas absorption cell and a Fabry‑ Perot interference cavity; the gas to be measured diffuses freely through the gap of the cantilever beam into the micro-gas chamber, and the photoacoustic signal generated by the acoustic wave-sensitive cantilever beam diaphragm is detected. The solution of the invention has the advantages of small probe size, fast response speed, simple structure, intrinsic safety, high sensitivity, etc., and provides a very competitive technical solution for the detection of trace gases in narrow pipelines by optical fiber photoacoustic gas sensing technology.
Description
technical field [0001] The invention belongs to the technical field of optical trace gas detection, and relates to an optical fiber tip photoacoustic gas sensing system and method. Background technique [0002] Methane is a colorless, odorless, flammable gas that is a very important source of clean energy, but methane gas can also cause catastrophic accidents such as explosions. However, some monitoring scenarios (such as narrow pipelines, etc.) have higher requirements on the size of the sensor. Therefore, it is of great significance to design a miniature and high-sensitivity gas sensor. [0003] Common trace methane gas detection methods include gas chromatography, electrochemical sensing, photoacoustic spectroscopy, and Raman spectroscopy, among which photoacoustic spectroscopy (PAS) has the advantages of high sensitivity and maintenance-free. However, existing photoacoustic spectroscopy gas detection systems often have problems such as large volume and system complexity...
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IPC IPC(8): G01N21/17G01N21/45G01N21/41
CPCG01N21/1702G01N21/45G01N21/41G01N2021/1704G01N2021/451G01N2021/458G01N2021/4173
Inventor 陈珂李晨阳李辰溪郭珉张博
Owner DALIAN UNIV OF TECH