Adjustable gradient acoustic impedance matching layer

Abstract

The invention belongs to the technical field of ultrasonic transducers and acoustic detection, and particularly relates to an adjustable gradient acoustic impedance matching layer which comprises a first to-be-matched material (1), a piezoelectric ceramic layer (2) and a second to-be-matched material layer (3). The piezoelectric ceramic layer (2) is arranged between the first to-be-matched material (1) and the second to-be-matched material layer (3), and comprises a plurality of piezoelectric ceramic pieces (5) connected in series and corresponding external shunt circuits (4); the piezoelectric ceramic pieces (5) are connected in series; and each piezoelectric ceramic piece (5) is independently connected with the external shunt circuit (4), and the acoustic impedance of each piezoelectricceramic piece (5) is adjusted by regulating and controlling the external shunt circuit (4), so that the acoustic impedance matching layer is in gradient distribution.

Description

technical field [0001] The invention belongs to the technical field of ultrasonic transducers and acoustic detection, and in particular relates to an adjustable gradient acoustic impedance matching layer. Background technique [0002] In ultrasonic testing and biomedical ultrasonic engineering, the impedance mismatch between the piezoelectric layer with high acoustic impedance and the working medium with low acoustic impedance will cause a large amount of acoustic energy loss, seriously affecting the detection accuracy. [0003] At present, the method of installing a matching layer in the impedance mismatch medium is mostly used to improve the acoustic energy transmission rate. The existing acoustic impedance matching layers include single-layer and multi-layer; some are filled with low-density particles and some use complex artificial periodic structures. However, once the above-mentioned acoustic impedance matching layer is manufactured, its impedance characteristics are ...

AI Technical Summary

Problems solved by technology

The existing acoustic impedance matching layers include single-layer and multi-layer; some are filled with low-density particles and some use complex artificial periodic structures

However, once the above-mentioned acoustic impedance matching layer is manufactured, its impedance characteristics are fixed, and it can only be applied to specific working conditions, and cannot meet different working conditions and environments, resulting in increased costs and complex manufacturing of the matching layer.

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