Anti-noise and breakpoint self-diagnosis distributed optical fiber sound sensing device

Abstract

The invention relates to an anti-noise and breakpoint self-diagnosis distributed optical fiber sound sensing device, and belongs to the technical field of distributed optical fiber sensing. The device comprises an ASE broadband light source, an isolator, a 3 * 3 coupler, a delay optical fiber, a 2 * 1 coupler, a 1 * 2 optical switch, a long-distance optical fiber, a sensing optical fiber, a Faraday rotator mirror, an acousto-optic modulator, an erbium-doped optical fiber amplifier, an optical fiber circulator, a photoelectric conversion module, an I/V conversion module, an A/D conversion module, a data processing module, an upper computer, a differential amplifier, a band-pass filter, an audio transformer, a pre-amplification unit, the power amplification unit, the control unit, the sound equipment, the earphone and the single-chip microcomputer module, which are mutually connected to form a set of complete distributed optical fiber sound sensing device. The problem that a distributed optical fiber sound sensing device which can clearly restore weak sound signals and carry out breakpoint detection on laid optical fibers and is capable of resisting noise and carrying out breakpoint self-diagnosis does not exist at present is solved.

Description

technical field [0001] The invention belongs to the technical field of distributed optical fiber sensing, and in particular relates to a distributed optical fiber sound sensing device with anti-noise and breakpoint self-diagnosis. Background technique [0002] Traditional sound sensing devices rely on electric power, so they cannot work normally in harsh environments such as strong electromagnetic interference, high temperature and high pressure, and humid climate. With the development of optical fiber sensors, interferometric optical fiber sound sensing systems are widely used in passive or electromagnetic interference environments due to their advantages of anti-electromagnetic interference, corrosion resistance, high sensitivity, wide transmission distance, and easy laying. Although the interferometric optical fiber acoustic sensing system is widely used, there are still some problems. When the laid optical fiber has faults such as breakpoints and breakages, it will grea...

AI Technical Summary

Problems solved by technology

[0004] The invention overcomes the deficiencies of the prior art, and proposes a distributed optical fiber sound sensing device with anti-noise and self-diagnosis of breakpoints; it solves the current lack of ability to clearly restore weak sound signals and detect breakpoints for laid optical fibers Problems of Noise Immunity and Breakpoint Self-diagnosis in Distributed Optical Fiber Sound Sensing Devices

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