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Distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation

A technology of distributed optical fiber and demodulation method, which is applied in the field of distributed optical fiber Raman temperature and strain demodulation based on loop demodulation, which can solve problems such as long measurement time, cross-sensitivity of temperature and strain, and inability to face engineering applications , to achieve the effect of speeding up and making it more convenient, improving the measurement speed and reducing the cost

Active Publication Date: 2020-01-03
TAIYUAN UNIV OF TECH +1
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Problems solved by technology

[0006] In order to solve the problems of cross-sensitivity between temperature and strain among the existing distributed optical fiber sensing systems, the measurement time is long, and the problems that cannot be applied to engineering, and the process of calibration required in the existing distributed optical fiber temperature measurement system, the present invention proposes A method for simultaneous detection of distributed optical fiber Raman temperature and strain based on loop demodulation

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  • Distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation
  • Distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation
  • Distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation

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Embodiment Construction

[0021] Specific embodiments of the present invention will be described in detail below.

[0022] A distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation, comprising the following steps:

[0023] Step 1. Build a distributed optical fiber temperature and stress sensing system based on loop demodulation;

[0024] The distributed optical fiber temperature and stress sensing system based on loop demodulation includes an optical fiber backscattering signal collector, a high-speed optical switch 7 , a constant temperature bath 8 , a sensing optical fiber, and a temperature sensor 10 .

[0025] The optical fiber backscatter signal acquisition instrument includes pulse laser 1, WDM 2, APD 3, LNA 4, data acquisition card 5, and computer 6; wherein, the output end of pulse laser 1 is connected to the input end of WDM 2; the output end of WDM 2 Connect with the input end of APD 3; The output end of APD 3 is connected with the input end of L...

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Abstract

The invention discloses a distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation, including building a distributed optical fiber Raman temperature and strain detection system based on loop demodulation; Optical fiber Raman temperature and strain detection system includes optical fiber backscattering signal acquisition instrument, high-speed optical switch, constant temperature bath, temperature sensor, sensing fiber; optical fiber backscattering signal acquisition instrument includes pulse laser, WDM, APD, LNA, data Acquisition card, computer; wherein, the output end of the pulse laser is connected with the input end of WDM; the output end of WDM is connected with the input end of APD; the output end of APD is connected with the input end of LNA; the output end of LNA is connected with the input end of data acquisition card The input end is connected; the output end of the data acquisition card is connected with the input end of the computer; the computer is bidirectionally connected with the temperature sensor. The detection method of the invention can utilize a sensing optical fiber to simultaneously detect the temperature and stress distribution along the optical fiber.

Description

technical field [0001] The invention relates to the technical field of temperature and strain demodulation in a distributed optical fiber sensing system, in particular to a distributed optical fiber Raman temperature and strain demodulation method based on loop demodulation. Background technique [0002] Distributed optical fiber sensing technology uses the optical fiber itself as both a signal transmission medium and a sensing unit to obtain the distribution of external physical quantities of the entire optical fiber link. The distributed optical fiber sensing system has high measurement accuracy, long sensing distance, and good reliability. It has been widely used in the health monitoring of infrastructure such as smart grids. [0003] In distributed optical fiber sensing technology, according to the backscattering type of optical fiber, it can be divided into distributed optical fiber sensing system based on Rayleigh scattering, distributed optical fiber sensing system ba...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K11/32G01K11/324
CPCG01K11/32
Inventor 张明江李健张建忠乔丽君闫宝强张军薛晓辉靳宝全王东王宇王云才
Owner TAIYUAN UNIV OF TECH
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