Broadband underwater acoustic transducer using composite material of metal, piezoelectric ceramics and polymer

Abstract

The invention provides a broadband underwater acoustic transducer using a composite material of metal, piezoelectric ceramics and a polymer, which comprises the composite material, a decoupling rubber, a seal acoustically transparent rubber, a metal shell and a water-proof cable, wherein the decoupling rubber is packed on the lateral surface and the bottom surface of the composite material; the seal acoustically transparent rubber is positioned on the upper surface of the composite material; the metal shell and the water-proof cable are packed outside the decoupling rubber; the composite material comprises a polymeric material, a compound column of the metal and piezoelectric ceramics and an electrode; and the compound column of the metal and the piezoelectric ceramics are evenly distributed in the polymeric material, and the electrode is plated on the upper and lower surfaces of the composite material. The invention can be applied to the fields of underwater sound communication sonar and water sound imaging sonar, is easy to be conformal, has good water pressure resistance and low acoustic impedance, and can realize the radiance with middle and high frequency, wide band and large power.

Description

technical field [0001] The present invention relates to an underwater acoustic transducer, in particular to a medium-high frequency broadband underwater acoustic transducer, which can be applied to the fields of underwater acoustic communication sonar, underwater acoustic imaging sonar and the like. Background technique [0002] Among the various forms of radiation known to people, the propagation of sound waves in sea water is the best. Therefore, in the utilization and development of marine undertakings, people make extensive use of underwater sound. The application of underwater sound constitutes the engineering discipline of sonar, and systems that utilize underwater sound in one form or another are called sonar systems. The underwater acoustic transducer is an important part of the sonar system. Transducers generally refer to electroacoustic transducers. Any transducer that can realize mutual conversion between electrical energy and sound energy is called an electroac...

AI Technical Summary

Problems solved by technology

However, its high impedance makes it difficult to match air and water, and it is dense, fragile, and difficult to process

In the 1970s, polymer piezoelectric materials represented by polyvinylidene fluoride (PVDF) had good flexibility and could be made into large and uniform films. The impedance matched air, skin and water, but its piezoelectric constant and electromechanical Coupling coefficient is small

However, over time, the performance of the matching layer will change, which can cause instability in the performance of the transducer

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