Abstract
After discussing the production of sound radiation suitable for ultrasonic interferometry in liquid media, a source is described in which a piezoelectric quartz plate mounted at a nodal plane for its principal vibration mode has one vibrating face exposed directly to the liquid media so that its motion may approximate that of a piston radiating into a semi-infinite medium. A review is given of some of the optical methods using continuous illumination that can be used in the investigation of ultrasonic radiation fields in liquids. Both progressive and standing sound wave systems are used with plane and divergent light. Photographs are included and bring out in a striking manner phenomena discussed in optics and acoustics.
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