Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing

A distributed optical fiber and wavelength division multiplexing technology, which is applied to measurement devices, uses wave/particle radiation, and measures ultrasonic/sonic/infrasonic waves, etc., which can solve the problem that the frequency and position information of vibration signals cannot be detected at the same time.

Active Publication Date: 2014-12-24
PIPECHINA SOUTH CHINA CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the technical problem that the simultaneous detection of vibration signal frequency and position information cannot be

Method used

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  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing
  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing
  • Distribution type optical fiber vibration detection method and system based on wavelength division multiplexing

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example one:

[0022] Please see figure 1 , Is the architecture diagram of a distributed optical fiber vibration detection system based on wavelength division multiplexing.

[0023] Among them, the system specifically includes: isolator, first coupler 1, delay fiber 2, second coupler 3, first wavelength division multiplexer 4, sensing fiber 5, second wavelength division multiplexer 6, Faraday rotator 7, first detector 8, first acquisition card 9, first data processor 10, modulator 11, first amplifier 12, circulator 13, second amplifier 14, filter 15, second detector 16, the second acquisition card 17, the second data processor 18.

[0024] The following describes the connection relationship and function of each component.

[0025] Among them, the isolator is used for the center wavelength λ 1 Wide-spectrum light source for processing.

[0026] The first coupler 1 is connected to the second coupler 3 through the delay fiber 2, and the first coupler 1 is also directly connected ...

Example Embodiment

[0044] Embodiment two:

[0045] Please continue to see figure 1 , Sagnac sensor and Φ-OTDR sensor share a sensing fiber.

[0046] Center wavelength is λ 1 As the light source of the Sagnac sensor, the broad-spectrum light source is divided into two beams (ie the first beam and the second beam) after being split by the first coupler 1. Wherein, the first coupler 1 includes but is not limited to a 2×2 coupler with a splitting ratio of 1:1.

[0047] After the first light beam passes through the delay fiber, it will enter the second coupler 3, and the second light beam will directly enter the second coupler 3 without passing through the delay fiber. Wherein, the second coupler 3 includes but is not limited to a 2×2 coupler with a splitting ratio of 1:1.

[0048] The main function of the delay fiber is to enhance the non-reciprocity effect in Sagnac.

[0049] The first light beam is transmitted from the second coupler 3, passes through the first wavelength division multiplexer 4, the sens...

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Abstract

The invention discloses a distribution type optical fiber vibration detection method and system based on wavelength division multiplexing. A Sagnac sensing system is formed by a wide spectrum light source, a first coupler, a delay optical fiber, a second coupler, a first wavelength division multiplexer, a sensor fiber, a second wavelength division multiplexer, a Faraday rotator, a first detector and a first collection card to detect the frequency of a vibration signal; a phi-OTDR sensing system is formed by a narrow linewidth light source, a modulator, a first amplifier, a circulator, a second amplifier, a filter, a second detector, a second collection card, a second data processor, the first wavelength division multiplexer and the second wavelength division multiplexer to detect the generating position of the vibration signal. Therefore, simultaneous detection of the position and frequency of the vibration signal can be achieved.

Description

technical field [0001] The invention relates to the field of vibration signal detection, in particular to a distributed optical fiber vibration detection method and system based on wavelength division multiplexing. Background technique [0002] Large-scale engineering structure health monitoring, oil pipeline maintenance, and geological disaster prevention all need to collect vibration signals. Distributed optical fiber vibration sensors have become a research hotspot due to their incomparable advantages over traditional sensors. Distributed optical fiber vibration sensors use the vibration-sensitive characteristics such as output phase and polarization of light waves during optical fiber transmission to realize real-time detection of vibration signals around optical fibers. [0003] According to different sensing principles, distributed optical fiber vibration sensors can be divided into two categories: interference type and backscatter type. The optical fiber vibration se...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 周琰田孝忠谭东杰孙巍马云宾刘路孟佳邱红辉王海明蔡永军
Owner PIPECHINA SOUTH CHINA CO
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