Fading-Free Multi-Wavelength Distributed Acoustic Sensing System and Differential Rotation Vector Superposition Method
A technology of rotation vector and acoustic wave sensing, applied in the direction of measuring ultrasonic/sonic/infrasonic waves, measuring devices, using wave/particle radiation, etc., can solve the problem of sacrificing the spatial resolution of the system, achieve interference and polarization fading suppression, and realize Interference fading suppression, to achieve the effect of polarization fading
Active Publication Date: 2022-08-05
HUAZHONG UNIV OF SCI & TECH
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However, this method of superimposing the scattering components of different frequencies in the chirped pulse will sacrifice the characteristics of the system such as spatial resolution
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[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as there is no conflict with each other.
[0055] figure 1 This is a schematic structural diagram of a distributed acoustic wave sensing system provided in an embodiment of the present invention; in order to explain the present invention more concisely, in this embodiment, the number of wavelengths of the laser light source is set to two. like figure 1 As shown, the distributed acoustic wave sensing system includes a non-fading multi-wavel...
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The invention discloses a non-fading multi-wavelength distributed acoustic wave sensing system and a differential rotation vector superposition method, belonging to the field of optical fiber sensing. The system comprises: a multi-wavelength light source module for generating multiplexed multi-wavelength probe light and Multiple independent local oscillators; the pulse modulation module is used for pulse modulation and frequency shifting of multi-wavelength probe light to generate short-pulse laser; the circulator is used to receive short-pulse laser and output multi-wavelength scattered light; the sensing cable is used to scatter short The pulsed laser forms multi-wavelength scattered light; the receiving module is used to demultiplex the multi-wavelength scattered light and make each independent local oscillator light interfere with the scattered light signal of the corresponding wavelength, and photoelectrically convert it to form a beat frequency signal; the differential vector superposition module is used for multiple Vector combining of wavelength beat signals; signal processing module is used for phase demodulation to obtain optical phase information distributed along the sensing optical cable. The present application can realize fully distributed high-precision distributed measurement without bad sectors, and reduce interference fading and polarization fading.
Description
technical field [0001] The invention belongs to the field of optical fiber sensing, and more particularly relates to a non-fading multi-wavelength distributed acoustic wave sensing system and a differential rotation vector superposition method. Background technique [0002] Distributed fiber optic acoustic wave sensor is based on phase optical time domain reflectometry technology It can acquire all vibration and strain information distributed along the sensing fiber in real time without blind spots. Therefore, distributed acoustic wave sensors are widely used in geological disaster warning, large-scale infrastructure health monitoring, and deep oil and gas exploration and other fields. However, in order to achieve high-precision real-time phase demodulation, the existing distributed acoustic wave sensing systems generally use ultra-narrow linewidth lasers as the sensing light source. Ultra-narrow linewidth lasers have ultra-long coherence distances and ultra-low random pha...
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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 孙琪真刘涛李豪范存政刘雨佳陈俊峰闫志君
Owner HUAZHONG UNIV OF SCI & TECH