Novel fiber hydrophone sound-sensitive structure and realization method thereof

Abstract

A novel fiber hydrophone sound-sensitive structure is characterized in that the sound-sensitive structure is made of a fiber coil and a polymeric material; the fiber coil is a cylindrical form coiling fiber, and embedded in the polymeric material; the sound-sensitive structure is a solid elastomer structure in an axisymmetric shape; the whole structure is formed by the fiber and the same polymeric material, is simple in structure, easy to make, and low in cost; on one hand, the problems that a conventional hollow sound-sensitive structure is poor in overpressure resistant performance can be solved; on the other hand, the fiber coiling structure is innovatively improved, the integral solid elastomer structure is combined, and the polyurethane embedding material with the smaller young modulus than a hard elastomeric material is employed, thus greatly improving the sound pressure sensitivity, and solving the contradictions between the interference type hydrophone sound-sensitive structure sound pressure sensitivity and overpressure resistant capability; the novel fiber hydrophone sound-sensitive structure is suitable for deep sea applications.

Description

technical field [0001] The invention belongs to the field of underwater acoustic detection, and relates to the technology of optical fiber hydrophones, in particular to the sound-sensitive structure of interference type optical fiber hydrophones. Background technique [0002] Interferometric fiber optic hydrophone is a kind of underwater acoustic sensor based on optical fiber and optoelectronic technology. It uses acoustically sensitive structures to convert sound pressure into tiny deformations in the fiber. Deformation of the fiber leads to changes in the optical phase signal in the fiber. Through the high-sensitivity optical coherent detection method, the change of the optical phase can be measured, thereby restoring the weak sound pressure signal. It has technical advantages such as high sensitivity, large dynamic range, high reliability, and can form a large-scale array, and has broad application prospects in the field of marine monitoring. [0003] In order to meet ...

AI Technical Summary

Problems solved by technology

However, although the elastic body with air backing structure has high sound pressure sensitivity, it needs to be strictly sealed, the manufacturing process is complicated, and there is a possibility of rupture under high water pressure (1000m deep seabed application)

If a solid elastomer structure is used to ensure its pressure resistance, the sound pressure sensitivity will be greatly reduced

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