A high-frequency close-packed piezoelectric film hydrophone matrix and its preparation method

Abstract

The invention relates to the technical field of underwater sound transducers, in particular to a high-frequency hydrophone array applicable to underwater phased array camera and a production method thereof, and solves the technical problems that a large cardinal number of high-frequency hydrophone array elements need to be accurately located and disposed in a limited array area and charge sensed by efficient coupling array elements is required to pick up and receive high-frequency weak underwater sound signals. A piezoelectric device PVDF (polyvinylidene fluoride) film, a rigid backing and PCBs (printed circuit board) are jointed; the high-frequency PVDF hydrophone backing is made of copper to increase sensitivity; multiple layers of PCBs are used as a substrate; a large number of array element backings are integrally pre-processed; the array element backing clusters are positioned and fitted to the PCB substrate; the backing units are separated by secondary processing; decoupling bars are added among the separated units; the piezoelectric film is adhered to form an array; finally, watertight sealing is performed to form the high-frequency piezoelectric film hydrophone array. The high-frequency hydrophone array is applicable to high-frequency sonar receiving arrays for imaging sonar, multi-beam sonar, side-scan sonar and the like.

Description

technical field [0001] The invention relates to the technical field of underwater acoustic transducers, in particular to a high-frequency hydrophone base array suitable for underwater phased array imaging sonar and a preparation method thereof. Background technique [0002] A typical representative of polymer piezoelectric film is PVDF (polyvinylidene fluoride) piezoelectric film. Compared with piezoelectric ceramics, PVDF piezoelectric film has the advantages of softness, good impact resistance, and acoustic impedance close to water. There are a wide range of applications. [0003] In the late 1970s, the research on PVDF hydrophone technology began internationally. The research direction mainly focuses on: (1) Medical ultrasonic sensors; (2) Large-area PVDF hydrophones with good anti-high wave number capabilities. Typical application examples are the French TMS2253 side array sonar hydrophone module and the The array of circular tube hydrophones mainly uses the high-volt...

AI Technical Summary

Problems solved by technology

[0010] The technical problem to be solved by the present invention is to accurately locate and arrange a large base number of high-frequency hydrophone array elements in a limited array area, and must efficiently couple the charges sensed by the array elements and pick up and receive high-frequency weak underwater acoustic signals. A high-frequency close-packed piezoelectric thin-film hydrophone array is designed. This design can simplify the structure of the receiving array, reduce the complexity of the process, and improve the reliability and yield. The specific technical scheme is as follows:

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