Dipulse optical fiber vibration sensing method based on time delay optical fiber

An optical fiber vibration and sensing method technology, applied in measuring devices, instruments, measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of complex methods and high operating costs, reduce complexity, improve signal-to-noise ratio and sensitivity, reduce The effect of system cost

Active Publication Date: 2019-04-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of complex traditional optical fiber sensing technology and high operating cost, and provide a dual-pulse optical fiber vibration sensing method based on time-delay optical fiber

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  • Dipulse optical fiber vibration sensing method based on time delay optical fiber
  • Dipulse optical fiber vibration sensing method based on time delay optical fiber
  • Dipulse optical fiber vibration sensing method based on time delay optical fiber

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[0017] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present ...

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Abstract

The invention discloses a dipulse optical fiber vibration sensing method based on a time delay optical fiber, and belongs to the technical field of optical fiber sensing. According to the method, twobeams of detection light pulses with an overlapped part are formed by adding the time delay optical fiber; and in an interference signal of Rayleigh scattered light of the two beams of the pulses, demodulation of phase change on a sensing optical fiber is realized, so that vibration information is obtained, and distributed multi-point sensing is realized. According to a system, the structures of coherent detection, an interferometer and the like are omitted; phase information is extracted in a direct detection mode; system configuration is greatly simplified; a demodulation mode is simple andfast; the overall cost is reduced; and the signal-to-noise ratio and the sensitivity are improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a dual-pulse optical fiber vibration sensing method based on a time-delay optical fiber. Background technique [0002] Distributed fiber optic sensors have become one of the research hotspots in the field of security and monitoring technology at home and abroad because they can measure in a large space and have many advantages such as high sensitivity, simple structure, and convenient use. Among them, the optical fiber distributed sensing system based on OTDR can realize the precise positioning of the time position of external vibration and the extraction of vibration information. It has the advantages of long sensing distance, high sensitivity, strong anti-electromagnetic interference ability, and small size, so it is widely used. It is used in oil and gas pipeline leak detection, peripheral security protection, structural health detection and other fie...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H9/00
CPCG01H9/006
Inventor 欧中华尹微裴雪超张婧蕾温钟平刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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