HIGH FREQUENCY ACOUSTIC HOLOGRAPHY IN SOLIDS.

Abstract

Although the attenuation of sound in liquids becomes very large at ultrahigh frequencies, it is possible to work with extremely thin liquid cells within the solid, the object to be imaged being introduced into the cell. An imaging system using this technique at an acoustic frequency of 50 MHz has been reported previously. The work described here is an extension of this technique to a frequency of 150 MHz.