Online Journal
IF値: 0.677(2017年)→0.966(2018年)


Journal of Medical Ultrasonics

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2015 - Vol.42

Vol.42 No.05

Review Article(総説)

(0579 - 0587)

超音波の2次現象 ‐波形歪み,音響放射圧,そして音響流‐

Second-order phenomena of ultrasound -waveform distortion, acoustic radiation pressure, and acoustic streaming-

鎌倉 友男1, 野村 英之2, 小塚 晃透3

Tomoo KAMAKURA1, Hideyuki NOMURA2, Teruyuki KOZUKA3

1電気通信大学 産学官連携センター, 2電気通信大学 情報理工学研究科, 3愛知工業大学工学部

1Center for Industrial and Governmental Relations, The University of Electro-Communications, 2Graduate School of Informatics and Engineering, The University of Electro-Communications, 3Aichi Institute of Technology

キーワード : nonlinear acoustics, waveform distortion, acoustic radiation pressure, acoustic streaming, ultrasound


A familiar example of waves are sound wave in air that are used as a medium for communication without being aware of their presence. At the same time, sound waves, particularly ultrasound are positively utilized as a collection tool of information in non-destructive testing and acoustical imaging. Generally, waves exhibit phenomena like diffraction, reflection, and interference. Radiation pressure is also one of the phenomena that waves have in common with each other. Acoustic radiation pressure is exerted on an interface that separates two acoustically different fluids and is provided by the difference of the acoustic energy densities in both fluids. Hence, it is regarded as a non-zero net pressure of the second order of smallness. Practically, acoustic radiation force is of importance in applications where evaluation is performed by integrating the radiation pressure over an obstacle surface. Although the radiation force is small as well, it can be utilized for non-contact levitation and manipulation of small obstacles by focusing ultrasound waves on them. This report overviews second-order classical phenomena caused by acoustic energy; specifically, the phenomena of waveform distortion, radiation pressure, and acoustic streaming.