Abstract
The optical techniques for the investigation of ultrasonic waves have been limited by the lack of an exact mathematical expression relating the velocity amplitude at the source to the optical phase retardation experienced by the light passing through the sound beam. For low frequencies, (i.e., Raman Nath region) general expressions for the optical phase retardation for plane radiators of arbitrary geometry in a rigid plane baffle have been developed. Results for circular and rectangular sources are presented. [Work supported by the Office of Naval Research.]
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