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Distributed optical fiber gas detection device and method with low-frequency detection performance

A distributed optical fiber and gas detection technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problem that the quantitative measurement of low-frequency signals cannot be realized, and achieve the effect of simple method

Pending Publication Date: 2019-12-31
YANCHENG INST OF TECH
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Problems solved by technology

The frequency range detected by the invention disclosed in the prior art is mainly tens of Hz to hundreds of Hz, and the quantitative measurement of lower frequency signals cannot be realized

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  • Distributed optical fiber gas detection device and method with low-frequency detection performance
  • Distributed optical fiber gas detection device and method with low-frequency detection performance
  • Distributed optical fiber gas detection device and method with low-frequency detection performance

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Embodiment Construction

[0020] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments. In order to better understand the technical content of the present invention, specific embodiments are given and described as follows in conjunction with the accompanying drawings.

[0021] It includes a first laser 200, a first isolator 201, an acousto-optic modulator 202, a first erbium-doped fiber amplifier 203, a circulator 204, a sensing fiber 205, a second erbium-doped fiber amplifier 206, and a second isolator connected in sequence 207, second laser 208, laser controller 209, lock-in amplifier 210, first coupler 211, delay fiber 212, second coupler 213, first photodetector 214, second photodetector 215, third photoelectric Detector 216 , signal acquisition card 217 , pulse generator 218 , signal processing and display unit 219 . The laser signal sent by the first laser (narrow-linewidth external ...

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Abstract

A distributed optical fiber gas detection device with a low-frequency detection performance comprises a first laser, a first isolator, an acousto-optic modulator, a first erbium-doped optical fiber amplifier, a circulator, a sensing optical fiber, a second erbium-doped optical fiber amplifier, a second isolator, a second laser, a laser controller and a lock-in amplifier which are connected in sequence. A third port of the circulator is sequentially connected with a first coupler, a delay optical fiber, a second coupler, a first photoelectric detector, a signal acquisition card and a pulse generator. A control end of the pulse generator is connected with the acousto-optic modulator. An output end of the signal acquisition card is connected with a signal processing and displaying unit. According to the invention, distributed optical fiber gas detection with low-frequency detection performance is realized by utilizing a measurement system of weak optical fiber grating reflection point fused self-coherence detection, a hollow-core photonic crystal optical fiber is used as a sensing optical fiber, a weak optical fiber grating is welded in the sensing optical fiber to be used as a fixedreflection point, and accurate measurement of low-frequency signals is realized by combining a plurality of detectors.

Description

technical field [0001] The invention relates to a gas detection device and method, in particular to a device and method for continuous distributed optical fiber gas detection. Background technique [0002] Distributed optical fiber sensor using optical fiber as the sensing and transmission medium. The entire optical fiber also functions as a sensing element while transmitting information, and can realize fully distributed monitoring along the optical fiber. Compared with traditional monitoring technology, distributed optical fiber sensor has many advantages, and it has received great attention once it appeared, and has attracted the attention of researchers in various fields. Therefore, it is imperative to develop various fiber optic gas sensors with high sensitivity, fast response and remote location detection, which has become the main research content in the field of sensing technology today. At present, the reported fiber optic gas sensors are mainly concentrated on poi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39
CPCG01N21/39Y02A50/20
Inventor 周锋徐东超王新宇祁欣玥戚志澳
Owner YANCHENG INST OF TECH
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