Wide-band high-sensitivity planar optical fiber vector hydrophone

Abstract

The invention discloses a wide-band high-sensitivity planar optical fiber vector hydrophone. The wide-band high-sensitivity planar optical fiber vector hydrophone mainly comprises optical fiber acceleration sensing units; four optical fiber acceleration sensing units are connected in series so as to form the hydrophone; a 2*2 coupler and Faraday rotation mirrors are fixed in an interferometer box; the acceleration sensing units and the interferometer box are fixed on a polyurethane foam board; fixing screws are distributed at four corners of the polyurethane foam board; the input and output optical fibers of the hydrophone are led out by an optical cable; the outermost layer of the hydrophone is sealed through filling a polyurethane adhesive layer; the optical fiber acceleration sensing unit is mainly composed of optical fiber discs, a sensitizing structure and shells, wherein two optical fiber discs are bonded at the upper surface and lower surface of the sensitizing structure, and the sensitizing structure is bonded to the upper shell and the lower shell through an epoxy adhesive. As for the requirements of work bandwidth and high sensitivity of a conformal array hydrophone, the acceleration sensing units are adopted, and the optical path and structure of the hydrophone of the invention are optimized, and therefore, technical problems in corresponding process implementation and assembly can be solved.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic optical fiber sensing, and more precisely relates to a broadband high-sensitivity planar optical fiber vector hydrophone. Background technique [0002] There are two problems encountered in the engineering application of conformal array and side array sonar: on the one hand, the traditional sound pressure hydrophone is used as the array element, and a rigid barrier needs to be installed between the hull and the hydrophone module. For hard baffles, due to their thicker thickness and heavy baffle weight, the entire array weighs more than ten tons; on the other hand, in order to increase the gain of the basic array, the conformal and side array sonar usually consists of hundreds or even A hydrophone consisting of thousands of primitives. The emergence of fiber optic vector hydrophones provides a good solution to the above two problems. [0003] At present, the application of vector hydr...

AI Technical Summary

Problems solved by technology

[0003] At present, the application of vector hydrophones is mainly concentrated in the frequency band below the very low frequency. There are few reports at home and abroad on how to achieve a flat sensitivity response in the wide frequency range of the middle and low frequency bands.

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