A microstructure fiber Bragg grating gas sensor and its detection device

Abstract

The invention relates to a microstructure fiber Bragg grating gas sensor and a detection device. The conventional sensing schemes are all based on the analysis of transmission spectra, no specificity selection is required for the detected gas, and device structures are incompact. The gas sensor provided by the invention is composed of a segment of a single mode fiber and a segment of a microstructure fiber, the Bragg grating is respectively etched on the two segments, and the detection device using the sensor comprises an optical circulator, a broadband light source and a spectrograph, wherein the light emitted by the broadband light source is input into the sensor through the optical circulator, and the sensor reflects the light into the spectrograph for analysis, so that, the concentration of the gas to be detected can be obtained. The sensor and the device have the advantages of being simple and practical in structures, specific in gas identification, excellent in anti-interferenceperformance, adaptive to complex conditions, suitable for remote distributed sensing, and the like.

Description

technical field [0001] The invention belongs to the field of optical fiber sensing, and relates to a microstructure optical fiber Bragg grating sensor capable of detecting gas concentration and a gas detection device using the sensor. Background technique [0002] In terms of industrial safety production, environmental quality and pollution monitoring, gas detection has become a very important content. Especially in harsh or dangerous environments, the need to realize remote real-time online monitoring is more urgent and widespread. Fiber optic sensors have been widely used in the field of gas sensing since the 1990s due to their simple fabrication, anti-electromagnetic interference, and long life, and have developed a lot—such as CO, C0 2 , CH 4 , C 2 h 2 And other fiber optic gas sensors. Among optical gas sensors, the commonly used detection principles are spectral absorption type, fluorescent type, optical fiber chemical material type, etc. Among them, the spectral...

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Problems solved by technology

Afterwards, the patent of CN200610012988.9 hollow-core photonic crystal fiber gas sensor proposed the use of hollow-core photonic crystal fiber as the specific structure of the gas chamber, which solved the problem that the optical fiber gas sensor system device based on the principle of spectral absorption is relatively complicated and the absorption path Difficult to control, large optical coupling loss, etc.

However, these sensing solutions are based on the analysis of transmission spectrum, and there is no specific choice for the gas to be detected, and the structure is not compact enough, usually including some electronic devices, which to a certain extent, reduces its practicability

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