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Distributed optical fiber temperature and strain detection method based on Raman scattering

A technology of distributed optical fiber and detection method, which is applied in the field of strain detection and temperature, can solve problems such as unsuitable for engineering application, long measurement time, cross-sensitivity between temperature and strain, and achieve reasonable design, increase measurement speed and reduce cost Effect

Active Publication Date: 2018-03-27
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0004] In order to solve the problems that the temperature and strain of the existing distributed optical fiber sensing systems are sensitive to each other, the measurement time is long, and cannot be applied to engineering applications, a Raman scattering-based distributed optical fiber temperature and strain simultaneous sensing system is proposed. Detection method

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  • Distributed optical fiber temperature and strain detection method based on Raman scattering
  • Distributed optical fiber temperature and strain detection method based on Raman scattering
  • Distributed optical fiber temperature and strain detection method based on Raman scattering

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] A distributed optical fiber temperature and strain detection method based on Raman scattering, comprising the following steps:

[0026] Step 1: Build a distributed optical fiber temperature and strain sensing system;

[0027] Distributed optical fiber Raman temperature measurement system, such as figure 1 As shown, it includes a Raman signal acquisition instrument, a first high-precision constant temperature bath 9 , a second high-precision constant temperature bath 10 , an optical fiber 11 to be tested, a first temperature sensor 12 , and a second temperature sensor 13 .

[0028] Such as figure 1 As shown, the Raman signal acquisition instrument includes a pulsed laser 1, WDM2, the first APD3, the second APD4, the first LNA5, the second LNA6, a data acquisition card 7, and a computer 8; wherein, the output of the pulsed laser 1 is co...

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Abstract

A distributed optical fiber temperature and strain detection method based on Raman scattering includes the steps of (1) establishing a distributed optical fiber temperature and strain sensing system,the distributed optical fiber temperature and strain sensing system including a Raman signal acquisition instrument, a first high precision constant temperature bath (9), a second high precision constant temperature bath (10), an optical fiber to be detected (11), a first temperature sensor (12), and a second temperature sensor (13), and the Raman signal acquisition instrument including a pulsed laser (1), a WDM (2), a first APD (3), a second APD (4), a first LNA (5), a second LNA (6), a data acquisition card (7) and a computer ( 8). The method of the invention has a reasonable design, integrates optical path, circuit and signal acquisition and processing technologies of the optical fiber Raman scattering and optical time domain reflection principle, and forms a novel temperature and strain distributed optical fiber sensing detection method based on Raman scattering.

Description

technical field [0001] The invention relates to the technical field of temperature and strain detection in a distributed optical fiber sensing system, in particular to a distributed optical fiber temperature and strain detection method based on Raman scattering. Background technique [0002] Through more than 30 years of development, distributed optical fiber sensing technology has realized the measurement of various physical quantities such as temperature, vibration, strain, displacement, and electromagnetic field, and its spatial resolution, sensing distance, and measurement accuracy have also been greatly improved. Big improvement. For the health monitoring of long-distance infrastructure, the occurrence of faults usually manifests itself as strain or vibration events, or changes in various parameters such as changes in ambient temperature. It is difficult to monitor a single physical quantity for effective early warning of accidents, or To judge the occurrence of faults...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01B11/16G01K11/324
CPCG01B11/18G01K11/32G01K11/324
Inventor 张明江李健张建忠刘毅乔丽君王东王宇靳宝全王云才
Owner TAIYUAN UNIV OF TECH
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