Non-fading multi-wavelength distributed sound wave sensing system and differential rotation vector superposition method
An acoustic wave sensing, multi-wavelength technology, applied in the measurement of ultrasonic/acoustic/infrasonic waves, measurement devices, and the use of wave/particle radiation, etc., can solve the problem of sacrificing the spatial resolution of the system, and achieve interference and polarization fading suppression Interference fading suppression, realizing polarization fading effect
Active Publication Date: 2021-04-23
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 object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, 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 they do not constitute a conflict with each other.
[0055] figure 1 It 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. Such as figure 1 As shown, the distributed acoustic wave sensing system includes a non-fading multi-...
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The invention discloses a non-fading multi-wavelength distributed acoustic wave sensing system and a differential rotation vector superposition method, and belongs to the field of optical fiber sensing. The system comprises a multi-wavelength light source module used for generating multiplexed multi-wavelength probe light and a plurality of independent local oscillation light; a pulse modulation module used for pulse modulation and frequency shift of the multi-wavelength probe light to generate short pulse laser; a circulator used for receiving the short pulse laser and outputting multi-wavelength scattered light; a sensing optical cable used for scattering the short pulse laser to form multi-wavelength scattered light; a receiving module used for demultiplexing the multi-wavelength scattered light and enabling each independent local oscillation light to interfere with a scattered light signal with a corresponding wavelength, and carrying out photoelectric conversion to form a beat frequency signal; a differential vector superposition module used for vector combination of the multi-wavelength beat frequency signals; and a signal processing module used for phase demodulation to obtain optical phase information distributed along the sensing optical cable. According to the invention, full-distributed high-precision distributed measurement without bad tracks can be realized, and interference fading and polarization fading are reduced.
Description
technical field [0001] The invention belongs to the field of optical fiber sensing, and more specifically relates to a non-fading multi-wavelength distributed acoustic wave sensing system and a differential rotation vector superposition method. Background technique [0002] Distributed optical fiber acoustic wave sensor is based on phase optical time domain reflection technology The new optical fiber sensing technology, which can obtain all the vibration and strain information distributed along the sensing optical fiber in real time without blind spots, therefore, distributed acoustic wave sensors are widely used in geological disaster early 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, existing distributed acoustic wave sensing systems generally use ultra-narrow linewidth lasers as sensing light sources. Ultra-narrow linewidth laser has ult...
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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