Abstract
The use of optical interferometry for the measurement of ultrasonic field parameters was demonstrated by Mezrich et al. [RCA Rev. 35, (December 1974)] and applications have been reported by others [M. E. Haran and H. F. Stewart “Optical interferometric measurements of ultrasonic radiation and its applications to medicine,” NBS SP456 (1976)]. This system, known as the ultrasonovision, has recently been interfaced to a Hewlett—Packard 21MX minicomputer. The result is a decrease by a factor of twenty in the time required to analyze each frame of data. In addition, a method has been developed to make the system self-correcting in that its performance is unaffected by variations in the light level, slight optical misalignment, or variations in reflectivity of the pellicle membrane. Details of the interface and self-correction method are given. Present studies with this system include mapping the field emitted by plane and focused transducers of low megahertz frequencies as a function of distance from the source.
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