Distributed optical fiber sensing system and detection method utilizing same

A technology of distributed optical fiber and sensing system, applied in the direction of measuring heat, measuring device, using optical device, etc., can solve the problems of high manufacturing cost, high temperature and strain decoupling cost, complicated installation, etc., to solve the problem of input optical pulse Contradictions of width and spatial resolution, do not affect response time, effect of decoupling temperature and strain

Inactive Publication Date: 2010-01-20
派克森公司
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  • Abstract
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Problems solved by technology

[0009] The present invention was invented aiming at the above-mentioned problems in the prior art. The present invention aims to solve the problems in the p

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  • Distributed optical fiber sensing system and detection method utilizing same
  • Distributed optical fiber sensing system and detection method utilizing same
  • Distributed optical fiber sensing system and detection method utilizing same

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Embodiment Construction

[0031] The content of the present invention will be specifically described below. It should be understood that the description here is only illustrative rather than restrictive, and the present invention also includes other modifications, replacements, combinations, etc. that those skilled in the art can think of according to the present invention.

[0032] First, introduce the principle of DTSS.

[0033] The Brillouin scattered light is the result of the interaction between the pump incident light and the optical phonons. The incident pump light absorbs or releases phonons to shift the frequency of the scattered light, wherein the pump light converts into higher-frequency anti-Stokes light by absorbing phonons, and obtains lower-frequency Stokes light by releasing phonons Light. The frequency shift of the scattered light depends on the speed of the sound wave. Since the temperature and strain of the fiber both affect the velocity of the sound wave in the fiber, the tempera...

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Abstract

The invention discloses a distributed optical fiber sensing system and a detection method utilizing the same. The optical fiber sensing system comprises a light source unit, an optical circulator, and a detection unit, wherein the light source unit emits light which is suitable for detecting and processing; the optical circulator receives the light which comes from the light source unit, and transmits the received light into a sensing optical fiber used for the detection; and the detection unit receives backscattered light caused by the light which enters the sensing optical fiber from the optical circulator, interference light formed by Rayleigh scattering light and scattered light of one component of Brillouin in the backscattered light through heterodyne interference is obtained in the detection unit and is converted into an electrical signal, and the detection unit also detects the electrical signal to obtain the change of the temperature and strain in the sensing optical fiber.

Description

technical field [0001] The invention relates to a distributed optical fiber sensing system, in particular to a distributed optical fiber sensing system based on Brillouin scattering and a method for detecting temperature and strain using the same. Background technique [0002] Distributed Fiber Optic Temperature Strain Sensing System (DTSS) is a relatively new distributed sensing technology with broad application prospects. Compared with other traditional sensing systems, DTSS is a distributed detection system, which has the advantages of high sensitivity, anti-electromagnetic interference, and the ability to simultaneously measure temperature and strain. [0003] There are mainly three kinds of scattered light when light is transmitted in the optical fiber: Rayleigh, Brillouin and Raman, among which Brillouin and Raman have two components of Stokes and anti-Stokes. By definition, the frequency-shifted component is Stokes light, and the frequency-up component is anti-Stokes...

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Application Information

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IPC IPC(8): G01K11/32G01B11/16G01K11/322
Inventor 崔洪亮常天英李亚T·科什契察隋清美贾磊
Owner 派克森公司
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