Abstract
The author is working towards the development of an ultrasonic viewing system which is an analog in ultrasound of conventional light photography. In the present paper it is shown that a sonic lens is able to resolve two sources of ultrasound whose spacing is about equal to the length of one wave of the sonic energy in use. It is also shown that at the frequency being used (3 Mc) uniform illumination of an object for sonic viewing is very difficult because Fresnel near field and other diffraction and interference effects occur very readily and that these effects are frequently themselves not stable.
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