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Experimental Studies on Acoustic Radiation Pressure

1955; Acoustical Society of America; Volume: 27; Issue: 5 Linguagem: Inglês

10.1121/1.1908068

1520-9024

Erna M. J. Herrey,

Material Properties and Applications

An apparatus is described which allows one to measure the normal and shearing component of the force of radiation pressure exerted by an ultrasonic beam through water on an intercepting disk. Results of measurements on an absorbing and on a reflecting disk are seen to confirm the theory of Brillouin that radiation pressure is due to a state of unidirectional stress in the region of a plane progressive wave and that it is properly represented by an anisotropic stress tensor. It also appears that the apparatus with the absorbing disk provides a very simple, and at the same time, accurate device for the absolute measurement of the power output of an acoustic transducer. Furthermore, it is shown how the measurement of radiation force components with this apparatus can be used for the determination of the average reflection-, transmission-, and absorption-coefficients of any sample material as functions of angle of incidence. Results of measurements on cork, aluminium, and steel plates are presented.