一种产生单极子超声脉冲及其声场的简单方法

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118) Pub Date : 1997-10-05 DOI:10.1109/ULTSYM.1997.661753

K. Imano, H. Inoue

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引用次数: 0

摘要

将无谐振分量的摆线函数电压加到压电陶瓷平面和凹圆形换能器上，产生单极子超声脉冲。利用单极子超声脉冲对两种换能器的轴上压力特性进行了观察。实验结果表明:1)单极子超声脉冲的声场由直波和边波组成，在换能器附近被及时分离;2)平面换能器发出的单极子超声脉冲在距离换能器较远的地方变成双极脉冲;3)凹面换能器发出的单极子超声脉冲在焦点周围逐渐变成双极脉冲。这些实验结果可以用单极子超声脉冲直接波和边缘波的干涉来解释。提出了在凹形换能器焦点处占主导地位的衍射效应的可能性。

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A simple method for generating the monopole ultrasonic pulse and its sound field

The cycloid function voltage having no resonant component is applied to the piezo-ceramic planar and concave circular transducers to generate the monopole ultrasonic pulse. On-axis pressure characteristics of two kinds of transducer are observed using monopole ultrasonic pulse. As the experimental results, 1) the sound field of monopole ultrasonic pulse is consisted of direct wave and edge wave, and these are separated in time near the transducer, 2) the monopole ultrasonic pulse from a planar transducer becomes bipolar pulse in the large distance from the transducer and 3) in case of the concave transducer, the monopole ultrasonic pulse is gradually changed to the bipolar pulse around the focus, are clearly observed. These experimental results can be explained by the interference between direct wave and edge wave using monopole ultrasonic pulse. A possibilities of the diffraction effect which dominated at the focus of concave transducer is also suggested.

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来源期刊

1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)

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