Gas detection system based on hollow-core anti-resonance optical fiber

Abstract

The invention provides a gas detection system based on a hollow-core anti-resonance optical fiber. The gas detection system comprises a laser device, a first gas cavity, a hollow-core anti-resonance optical fiber, a second gas cavity, a spectrograph and a data processing device, wherein two ends of the hollow-core anti-resonance optical fiber are respectively communicated with the first gas cavityand the second gas cavity; the first gas cavity and the second gas cavity are used for injecting to-be-detected gas into the hollow-core anti-resonance optical fiber; the laser device is used for inputting detection laser into the hollow-core anti-resonance optical fiber; the spectrograph is used for measuring Raman scattering light generated by to-be-detected gas; and the data processing deviceis used for processing a Raman spectrum and analyzing the contents and concentration of to-be-detected gas. The hollow-core anti-resonance optical fiber has the characteristics that the transmission loss is low, the transmission bandwidth is wide, the bending loss is low, the damage threshold is high, and single mode transmission is maintained; and the Raman scattering threshold is reduced, and the contents and the concentration of trace gas can be detected by virtue of pump light with relatively low power.

Description

technical field [0001] The invention relates to the field of optical technology, more specifically, to a gas detection system based on a hollow-core anti-resonant optical fiber. Background technique [0002] Scattering occurs when light hits the material, and the scattering of light is divided into elastic scattering and inelastic scattering; for elastic scattering, the frequency of scattered light is equal to the frequency of incident light; for inelastic scattering, the frequency of scattered light is equal to the frequency of incident light The frequencies are not equal. The frequency of scattered light is greater than that of incident light, which is called anti-Stokes light, and the frequency of scattered light is less than that of incident light, which is called Stokes light. The two are collectively called Raman scattering. [0003] The composition and concentration of the gas can be detected by measuring the Raman spectrum of the gas. In the prior art systems for det...

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Problems solved by technology

[0005] The present invention provides a gas detection system based on hollow-core anti-resonant optical fiber that overcomes the above problems or at least partially solves the above problems, and solves the problem of large optical loss, short action length and large gas volume required in the gas detection system in the prior art , The problem of very high pump light power

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