Three-pulse dislocation interference grating enhanced distributed vibration demodulation system and method

A technology of demodulation system and pulsed light modulator, which is applied in the direction of instruments, measuring devices, and using wave/particle radiation, etc., can solve the problems of not easy to reuse, reduce light intensity, and high cost, and achieve wide application and high visibility , the effect of simple structure

A technology of demodulation system and pulsed light modulator, which is applied in the direction of instruments, measuring devices, and using wave/particle radiation, etc., can solve the problems of not easy to reuse, reduce light intensity, and high cost, and achieve wide application and high visibility , the effect of simple structure

CN113188647AActive Publication Date: 2021-07-30WUHAN UNIV OF TECH
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  • Three-pulse dislocation interference grating enhanced distributed vibration demodulation system and method
  • Three-pulse dislocation interference grating enhanced distributed vibration demodulation system and method
  • Three-pulse dislocation interference grating enhanced distributed vibration demodulation system and method

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Embodiment Construction

[0022] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0023] Such as figure 1The grating-enhanced distributed vibration demodulation system with three-pulse misalignment interference shown, it includes a laser 1, a pulsed light modulator 2, a three-pulse generating polarization-maintaining structure 4, a first erbium-doped fiber amplifier 10, and a first optical circulator 12. Fiber Bragg grating array 14, second erbium-doped fiber amplifier 17, second optical circulator 19, three-point three-point optical coupler 20, first Faraday rotating mirror 21, second Faraday rotating mirror 23, four-channel data acquisition card 25, Wherein, the signal output end of the laser 1 is connected to the signal input end of the pulse light modulator 2, the optical pulse output end of the pulse light modulator 2 is connected to the signal input end of the three-pulse generation polarization maintaining structure 4,...

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Abstract

The invention discloses a grating enhanced distributed vibration demodulation system based on three-pulse dislocation interference. The system comprises a laser device, a pulsed light modulator, a three-pulse generation polarization-maintaining structure, a first erbium-doped optical fiber amplifier, a first optical circulator, a fiber grating array, a second erbium-doped optical fiber amplifier, a second optical circulator, a three-in-three optical coupler, a first Faraday rotator mirror, a second Faraday rotator mirror and a four-channel data acquisition card. Based on the distributed fiber grating vibration sensing system, the three-pulse dislocation interference and three-in-three optical coupler digital phase demodulation technology is adopted, XX and XY pulses are utilized to complement interference visibility, and demodulation is performed by selecting a better one, so that polarization fading resistance and interference signal high visibility in the distributed fiber grating vibration sensing system are realized.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a grating-enhanced distributed vibration demodulation system and method for three-pulse misalignment interference. Background technique [0002] Since the advent of optical fiber sensing technology, it has been widely concerned and studied deeply due to its many advantages. Optical fiber as a sensor has been widely researched and applied because of its passive, small size and easy multiplexing. Using Phase Sensitive Optical Time Domain Reflectometry The optical fiber sensing system has the characteristics of high sensitivity and has very important application value in many fields. Compared with the traditional electrical sensing system, it has better sensing performance and wider application in various harsh environments. prospect. In order to improve the positioning accuracy and detection sensitivity to realize the sensing of tiny signals, researchers have intr...

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Application Information

Patent Timeline
30 Jul 2021
Publication
CN113188647A
IPC
G01H9/00
CPC
G01H9/004
Inventors
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