Distributive optical fiber vibration sensing system based on wave division multiplex technology

A vibration sensing system and distributed optical fiber technology are applied in the directions of using wave/particle radiation, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., which can solve the problems of difficulty in taking into account vibration frequency measurement and vibration position measurement, and increased system cost. Achieve the effect of saving system cost, high-precision detection, and shortening length

Active Publication Date: 2013-02-13
成都塔科光电技术有限公司
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Problems solved by technology

[0004] In the prior art, the research on the vibration sensing system based on optical fiber technology has been very extensive, but the existing measurement methods generally have the problem that the vibration frequency measurement and the vibration position measurement are difficult to balance, so two systems must be arranged in the measurement space, one One set is used for vibration freq

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  • Distributive optical fiber vibration sensing system based on wave division multiplex technology
  • Distributive optical fiber vibration sensing system based on wave division multiplex technology
  • Distributive optical fiber vibration sensing system based on wave division multiplex technology

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[0023] A distributed optical fiber vibration sensing system based on wavelength division multiplexing technology, including: a pulsed light source 1, a three-port circulator 2, a first photodetector 3, a long-distance sensing fiber 4, and a first polarization controller 5; The pulse light source 1 is connected to the input end of the three-port circulator 2, the transceiver multiplexing end of the three-port circulator 2 is connected to the first photodetector 3, and the output end of the three-port circulator 2 is connected to the first polarization controller 5. The first polarization controller 5 is connected to one end of the long-distance sensing fiber 4, and the other end of the long-distance sensing fiber 4 is idle;

[0024] The improvement is that it also includes a ring laser 7, a first coupler 8, a first wavelength division multiplexer 9, a second polarization controller 10, a second Bragg fiber grating 12, a second photodetector 13, and a third photodetector 器14; Among ...

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Abstract

The invention discloses a distributive optical fiber vibration sensing system based on the wave division multiplex technology, which comprises a vibration position detector and a vibration frequency detector. According to the invention, the vibration position detector and the vibration frequency detector share a long-distance sensing optical fiber by a special structure. The distributive optical fiber vibration sensing system has the beneficial technical effects that under the condition of simultaneously obtaining the vibration position signal and vibration frequency signal, the length of the long-distance sensing optical fiber required to be arranged is greatly shortened, and the system cost is saved; and based on the mature wave division multiplex technology, the accuracy of two optical signal is guaranteed, so that the system can realize high-precision detection on the vibration position signal and the vibration frequency signal.

Description

technical field [0001] The invention relates to a distributed optical fiber vibration sensing system, in particular to a distributed optical fiber vibration sensing system based on wavelength division multiplexing technology. Background technique [0002] Vibration measurement has potential application value in engineering fields, such as structural health monitoring, aerospace, petrochemical, power system and other safety monitoring; traditional vibration measurement methods such as mechanical measurement and electrical measurement have low sensitivity and large volume 1. The measurement range is limited by the amplification device, and the traditional vibration measurement method can only perform point measurement, which is limited in practical application. Therefore, it is imperative to develop a high-performance vibration measurement system. [0003] Distributed optical fiber sensing technology refers to the continuous modulation of the light wave in the optical fibe...

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Application Information

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IPC IPC(8): G01H9/00
Inventor 朱涛肖向辉何茜
Owner 成都塔科光电技术有限公司
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