Optical fiber hydrophone array adopting reflective quasi-reciprocity optical path

Abstract

The invention belongs to the technical field of optical fiber sensing, and particularly discloses an optical fiber hydrophone array adopting a reflective quasi-reciprocity optical path. The optical fiber hydrophone array comprises a light source, a beam splitter A, a polarizer, a phase modulator, a delay optical fiber, a beam splitter B, a sensing unit array and a photoelectric detector; the sensing unit array comprises a faraday rotator, an acoustic probe, a compensated optical fiber and a reflector. The invention provides the optical fiber hydrophone array adopting the reflective quasi-reciprocity optical path, can effectively inhibit the polarization state random fluctuation in the optical path and solves the problem of polarization-induced fading of a conventional hydrophone; and the invention adopts the quasi-reciprocity optical path scheme, so that the immunocompetence for the environmental interference is strong. The invention also adopts the reflective optical path, a signal passes through the acoustic probe back and forth for twice and the efficiency of detecting a sound pressure signal is twice of that of a conventional optical fiber sensor, the sensitivity is effectively improved, the multiplexing efficiency is high, the structure is simple and the phase noise is low.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to an optical fiber hydrophone array using a reflective quasi-reciprocal optical path for detecting sound pressure by using interference light phase. Background technique [0002] Sound waves are currently the most effective carrier capable of transmitting information over long distances in the ocean. Detecting the space-time structure of the sound field formed by the sound wave carrying the signal in the ocean is an important means for underwater detection, identification, communication and environmental monitoring. It can be used for long-distance military target detection, seabed mineral development, fish schools Detection can also be used for telemetry of ocean dynamic processes (internal waves, circulation) and detection of ocean and land seismic waves. Therefore, advanced underwater acoustic detection technology is of great significance to national e...

AI Technical Summary

Problems solved by technology

[0011] (1) The present invention proposes a fiber optic hydrophone array using a reflective quasi-reciprocal optical path, which can effectively suppress the random fluctuation of the polarization state in the optical path and solve the polarization fading problem of traditional hydrophones

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