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Distributed optical fiber gas sensor based on differential mode

A distributed optical fiber and gas sensor technology, applied in instruments, scientific instruments, analytical materials, etc., can solve the problem of low energy utilization rate of light sources, achieve long-distance multi-point multiplexing, avoid beam splitting, and improve system signal-to-noise Effect of ratio and detection accuracy

Active Publication Date: 2019-11-19
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fiber optic gas sensor in the prior art has a low energy utilization rate of the light source. How to further improve the energy utilization rate of the light source and reduce the noise of the node gas sensor has always been a hot spot in the research of fiber optic gas sensors.

Method used

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  • Distributed optical fiber gas sensor based on differential mode
  • Distributed optical fiber gas sensor based on differential mode
  • Distributed optical fiber gas sensor based on differential mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] See figure 1 , figure 1 It is a schematic diagram of a distributed optical fiber gas sensor based on a differential mode provided by an embodiment of the present invention. The distributed fiber optic gas sensor in this embodiment includes a tunable laser 1 , a modulation signal generating unit 2 , a fiber coupling module 3 , a distributed sensing module 4 , a central processing unit 5 and a control terminal 6 . The wavelength range of the tunable laser 1 can cover the absorption characteristic peaks of various gases to be detected, its input end is connected to the output end of the modulation signal generation unit 2, and its output end is connected to the input end of the fiber coupling module 3, the modulation signal generation unit 2 can Generate the current and temperature signals required to adjust the tunable laser 1, so as to realize the adjustment of the wavelength and output energy of the tunable laser 1; the fiber coupling module 3 can convert the main lase...

Embodiment 2

[0046] On the basis of the above embodiments, this embodiment describes in detail the structures of the differential detection unit and the node signal processing unit in the distributed sensing module.

[0047] See image 3 , image 3 is a schematic diagram of a distributed sensing module provided by an embodiment of the present invention, wherein the dotted arrow indicates the direction of light propagation. As shown in the figure, the differential detection unit 41 includes a sample cell 411 , a reference cell 412 and a mirror chopper 413 . In this embodiment, the chopping plate of the mirror chopper 413 is a total reflection plate coated with a high reflection film on one side. . Such as image 3 As shown by the dotted arrow, the optical axis of the incident light of the branch optical fiber 33 and the chopping plate of the mirror chopper 413 form an angle of 45°, and the incident light can be alternately irradiated by the rotation of the mirror chopper 413 On the sam...

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PUM

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Abstract

The invention relates to a distributed optical fiber gas sensor based on a differential mode, and the sensor comprises a tunable laser, a modulation signal generating unit, a fiber coupling module, distributed sensing modules, a central processing module and a control terminal, wherein the tunable laser is configured to generate main laser energy; the modulation signal generating module is configured to adjust the wavelength of the tunable laser; the fiber coupling module is connected to the distributed sensing modules and configured to couple the main laser energy to a plurality of paths of branch fibers; the distributed sensing modules are configured to convert the branch laser energy into a photoacoustic signal reflecting the information of the gas to be tested; the central processing module is configured to receive and process the photoacoustic signal; and the control terminal is configured to control the central processing module and the modulation signal generating unit. The distributed optical fiber gas sensor provided by the the invention transmits single light source energy to a plurality of distributed sensing modules through the fiber coupling module, thereby realizing multiple multiplexing of optical energy and gas concentration detection in a wide interval.

Description

technical field [0001] The invention belongs to the technical field of gas nondestructive detection, and in particular relates to a distributed optical fiber gas sensor based on a differential mode. Background technique [0002] A gas sensor is a converter that converts a certain type and content of a gas into a corresponding electrical signal. It has important application value in many aspects such as pollution detection, industrial production, aerospace, fire early warning, and medical diagnosis. Among them, the fiber optic gas The sensor is based on an optical measurement method, which can realize non-contact online detection of gas in difficult-to-reach dangerous areas or difficult-to-reach unfavorable terrains, without causing any damage to the measured object. The optical fiber gas detection method has the advantages of no need for complex pretreatment of gas samples, simple measurement process, low background noise, non-destructive and non-polluting, etc. The needs of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/39G01N21/01
CPCG01N21/39G01N21/01
Inventor 刘丽娴邵晓鹏宦惠庭
Owner XIDIAN UNIV