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Abstract
Medium with gradient change of acoustic impedance is a new type acoustic structure. It is composed of several materials and has a continuous gradient composition and structure whose specific acoustic impedance varies smoothly across the layer. It has been used in various practical situations such as acoustic rectifiers, medical devices, weakening vibration and reducing noise. The purpose of this paper is to investigate the effect of boundary impedance mismatch on acoustic characteristics of gradient impedance media. The propagation mechanism of acoustic waves in medium with gradient change of specific acoustic impedance was calculated by transfer matrix method. By setting the different ratios of the acoustic impedance at interfaces of matching layer, the relationship between specific acoustic impedance mismatch and acoustic characteristics are derived and the corresponding conclusions are drawn. These conclusions provide an idea for the preparation of relevant medium.
Highlights
Acoustic materials have attracted great research attention due to their wide applicability, such as medical treatment, construction industry and military field[1]
When acoustic impedance mismatch between boundary of medium and water, the degree of acoustic impedance mismatch should be less than 20%, which reduces the difficulty of preparing the medium and makes the deviation of acoustic characteristic less than 2%
When acoustic impedance mismatch between boundary of medium and aluminum, it has little effect on acoustic characteristics
Summary
Acoustic materials have attracted great research attention due to their wide applicability, such as medical treatment, construction industry and military field[1]. Among all these fields, medium with gradient change of acoustic impedance has been developing rapidly because of its unusual material parameters[2]. Feng presented the micro fabrication of an acoustic impedance gradient matching layer on a spherically-shaped piezoelectric ultrasonic transducer[6]. Kimura proposed a wideband polymer ultrasonic transducer having acoustic impedance matching layers[7]. Medium with gradient change of acoustic impedance is difficult to match the acoustic impedance on both sides of the medium due to
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