Analysis of echoes from a sphere which includes the directivity of a transmitter and a receiver
作者:
Mitsuhiro Ueda,
Eishi Morimatsu,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 87,
issue 5
页码: 1903-1910
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.399317
出版商: Acoustical Society of America
关键词: ECHOES;SPHERES;ULTRASONIC WAVES;SPHERICAL WAVES;SCATTERING;ULTRASONIC TRANSDUCERS
数据来源: AIP
摘要:
Analysis of an echo from a solid elastic sphere has been limited to the case of a plane incident wave so far. Plane‐wave theory is modified to the case of spherical incident wave first, and then it is modified to the case of an arbitrary ultrasonic transmitter and receiver by considering them as a set of point sources and point receivers, respectively. Using this relation, the general properties of the echo scattered from the sphere are analyzed first, and then the analysis is carried out in full for important practical cases; that is, the sphere is placed on the focal point of a circular concave transducer and in the focal plane of the transducer. It is applied to study the material dependence of the echo from the sphere placed at the focal point of the transducer as well as that of the sidelobe structure of the echo. These results are compared with those experimentally obtained using metal and plastic spheres of 3 mm in diameter, which show very good agreement.
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