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Optical fiber acoustic sensing system based on broadband weak reflecting mirrors and random laser

A random laser and acoustic wave sensing technology, applied in the field of photoelectric transmission, can solve the problems of narrow FBG reflection bandwidth, unfavorable random distribution amplification, failure, etc., and achieve the effects of improving detection sensitivity, low relative intensity noise, and increasing power

Active Publication Date: 2017-10-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

The existing technology uses extremely weak inverse fiber Bragg grating (FBG) instead of Rayleigh scattering to increase the feedback intensity of signal light, but this technology is limited by the temperature drift effect of FBG. Once the FBG temperature drift is too large and does not correspond to the wavelength , the written FBG will fail, so it cannot work in a scene with a wide range of temperature changes, and the FBG reflection bandwidth is narrow, which is not conducive to the introduction of random distribution amplification method

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  • Optical fiber acoustic sensing system based on broadband weak reflecting mirrors and random laser
  • Optical fiber acoustic sensing system based on broadband weak reflecting mirrors and random laser
  • Optical fiber acoustic sensing system based on broadband weak reflecting mirrors and random laser

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Embodiment Construction

[0016] In order to facilitate those skilled in the art to understand the technical content of the present invention, the content of the present invention will be further explained below in conjunction with the accompanying drawings.

[0017] The invention provides a fiber optic acoustic wave sensing system based on broadband weak mirrors and random lasers, which includes a sensing fiber, and a broadband weak mirror array is written in the sensor fiber.

[0018] The optical cable made based on the sensing optical fiber is filled with an acoustic wave-sensitizing medium, and the sensing optical fiber is placed in the medium to enhance the effect of the acoustic wave on the optical fiber.

[0019] The working principle of the broadband weak mirror array written in this application is as follows:

[0020] The advantage of the broadband weak mirror is that it can work in a high temperature environment and can effectively feedback the incident light signal without being affected by ...

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Abstract

The invention discloses an optical fiber acoustic sensing system based on broadband weak reflecting mirrors and random laser, and is applied to the field of photoelectric transmission. A broadband weak reflecting mirror array is written in a sensing optical fiber so that the random laser generated by pump light through coherent feedback can be realized and the power of the pump light can be increased. The random laser provides distributed Raman amplification for the signal light of a detection light source. The distributed Raman amplification can be used for compensating the insertion loss of the broadband weak reflecting mirror array, amplifying the feedback light and enhancing the optical signal-to-noise ratio so as to enhance the detection fallibility and acquire high spatial resolution by controlling the space between the adjacent broadband weak reflecting mirrors. Random laser amplification has lower relative intensity noise so as to acquire the low-noise distributed amplification.

Description

technical field [0001] The invention belongs to the field of photoelectric transmission, in particular to an all-fiber distributed acoustic wave sensing technology. Background technique [0002] All-fiber distributed acoustic wave sensing technology is widely used in oil and gas exploration, seismic wave detection and other fields. Traditional distributed acoustic wave sensing uses the signal light fed back by Rayleigh scattering to demodulate it to obtain the signal light brought by the action of acoustic waves. The phase changes, so as to realize the measurement of sound waves. The existing technology uses extremely weak inverse fiber Bragg grating (FBG) instead of Rayleigh scattering to increase the feedback intensity of signal light, but this technology is limited by the temperature drift effect of FBG. Once the FBG temperature drift is too large and does not correspond to the wavelength , the written FBG will fail, so it cannot work in a scene with a wide range of temp...

Claims

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 冉曾令李康祝文超饶云江马瑞
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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