Distributed optical fiber gas detection device based on photoacoustic spectrometry

Abstract

The invention provides a distributed optical fiber gas detection device based on photoacoustic spectrometry. The distributed optical fiber gas detection device comprises a laser module, a gas detection module, a signal receiving unit and a computing terminal. The lasers output by the laser module enter a single mode optical fiber which is cascade connected with the gas detection module, the gas detection module utilizes wireless telegraphy to transmit the detected signal to the signal receiving unit, and the signal receiving unit sends the received detected signal to the computing terminal. The laser module is composed of a tunable laser, a laser controller and a signal modulator. The gas detection module is composed of a gas sensing unit, a signal amplifier, a signal demodulator and a radio signal transmitting module. The distributed optical fiber gas detection device based on the photoacoustic spectrometry outputs the internal light field in a coupling mode through a micro-nano device with the defected high Q value, and the device is simplified, easy to integrate, small in size and high in sensitivity.

Description

technical field [0001] The invention relates to the technical field of photoacoustic spectrum gas detection, in particular to a photoacoustic spectrum-based distributed optical fiber gas detection device. Background technique [0002] With the continuous development of modern industry, many toxic and harmful gases will inevitably be produced due to technological limitations in the production and manufacturing process, which will lead to air pollution and affect people's health; many oil transportation pipelines are exposed outdoors all the year round. Due to long-term rainwater erosion and corrosion, pipelines often overflow or leak. The resulting property losses and personnel safety hazards are immeasurable. However, due to the large area of ​​these areas and the low concentration of pollutants in the initial stage of the incident, it is difficult to find them. [0003] Therefore, it is particularly important to study a technology that can flexibly detect gas in the detecte...

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Problems solved by technology

[0002] With the continuous development of modern industry, many toxic and harmful gases will inevitably be produced due to technological limitations in the production and manufacturing process, which will lead to air pollution and affect people's health; many oil transportation pipelines are exposed outdoors all the year round. Long-term rainwater erosion and corrosion, pipelines often overflow or leak, resulting in property losses and personnel safety hazards are immeasurable, but due to the large area of ​​these areas and the low concentration of pollutants in the early stage of the incident, it is difficult to find

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