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Device for realizing high-sensitivity distributed sound wave sensing based on small-diameter multimode optical fiber

A multi-mode optical fiber and high-sensitivity technology, applied in measuring devices, measuring ultrasonic/acoustic/infrasonic waves, utilizing wave/particle radiation, etc., can solve false positives and false negatives in acoustic signal identification, and the sensitivity of distributed optical fiber vibration sensing systems Insufficient and other problems, to achieve the effect of increasing the amount of light phase change, improving the detection limit of the system, and improving the sensitivity

Pending Publication Date: 2017-03-15
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

based on In terms of acoustic wave sensing (ZL201310384147.0), due to the extremely weak effect of sound waves on the vibration of optical fibers, the sensitivity of the distributed optical fiber vibration sensing system is still far from enough, which can easily cause false positives and false positives in the identification of acoustic wave signals

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  • Device for realizing high-sensitivity distributed sound wave sensing based on small-diameter multimode optical fiber
  • Device for realizing high-sensitivity distributed sound wave sensing based on small-diameter multimode optical fiber
  • Device for realizing high-sensitivity distributed sound wave sensing based on small-diameter multimode optical fiber

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[0029] The specific implementation of the present invention will be further described below in conjunction with the embodiments and accompanying drawings. It should be pointed out that if there are any parameters or components not specified below, those skilled in the art can use the existing conventional technology to realize.

[0030] like figure 1, This example is based on a thin-diameter multi-mode optical fiber to achieve a schematic diagram of a high-sensitivity distributed acoustic wave sensing device. The system uses a high-coherence narrow-linewidth laser as a light source, and the light is split into two paths by a coupler, and one path is modulated into an optical pulse by a pulse modulator. Sequence, amplified by an optical amplifier and then injected into the thin-diameter multimode fiber through a circulator, the back Rayleigh scattered light in the narrow multimode fiber is transmitted back through the circulator, and another local oscillator frequency-shifted by...

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Abstract

The invention provides a device for realizing high-sensitivity distributed sound wave sensing based on a small-diameter multimode optical fiber. The device comprises the components of a light source first optical fiber coupler, a pulse modulator, an optical amplifier, a frequency shifter, an optical circulator, a single-mode optical fiber, a fusion part, a small-diameter multimode optical fiber, a second optical fiber coupler, a double-balance detector, and an information acquisition and processing unit. After amplification by means of the optical amplifier, a signal is input into the small-diameter multimode optical fiber through the optical circulator. Backward Rayleigh scattering light in the small-diameter multimode optical fiber is transmitted back through the optical circulator, thereby realizing heterodyne beat with the other path of intrinsic light which is shifted by the frequency shifter. A beat frequency optical signal is converted to an electric signal through the detector, and then data signal acquisition and processing are performed. The small-diameter multimode optical fiber according to the invention can greatly improve sensing signal strength and greatly improves sound wave sensing sensitivity. A distributed sound wave sensing system based on the small-diameter multimode optical fiber can realize real-time high-sensitivity monitoring and positioning of a sound wave signal in the range of an ultra-long-distance sensing optical fiber.

Description

technical field [0001] The invention relates to the field of distributed optical fiber sensing, in particular to a device for realizing high-sensitivity distributed acoustic wave sensing based on thin-diameter multimode optical fibers. Background technique [0002] The role of the acoustic wave sensor is equivalent to a microphone (microphone). Commonly used electrical acoustic wave sensors are: carbon powder resistive audio sensor, moving coil electromagnetic audio sensor, metal strip electromagnetic audio sensor, film capacitive audio sensor, electret capacitive audio sensor, piezoelectric ceramic audio sensor wait. Optical fiber acoustic sensors mainly include fiber optic grating acoustic sensors (ZL 201310397250.9), fiber laser hydrophones (ZL 200910242754.7), optical fiber interferometer acoustic sensors (ZL 201010023111.6, 201310077523.1). Interference (EMI), anti-radio frequency interference (RFI), wide frequency band, corrosion resistance, strong confidentiality, h...

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Application Information

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IPC IPC(8): G01H9/00
CPCG01H9/004
Inventor 甘久林杨中民吴郁清李炯徐善辉
Owner SOUTH CHINA UNIV OF TECH
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