Ultrasonic projector

Birdwell J.D., Jin Y-C, Paulus T.J., Mazzola C.J., and Barnes R.W. "Computer control of radiated pressure for an ultrasonic projector." pp 524-529, Ultrasonics International 83, Butterworth Scientific Ltd (July 1983). 

Procedure Switch on the ultrasonic cleaning tank filled with water and watch for the position of cavitation activity through the circular rings formed on the surface of water. Hold the Al-foil on the circular ring for 2-3 min and remove. Watch the foil against the light or through an overhead projector for the holes created on it as a result of cavitation. 

Three techniques were developed and utilised to assess the bend of the guide tube, viz., optical inspection, ultrasonic air gauging and mechanical disc gauging. Optical inspection was carried out with a periscope/projector system (Fig 7). Sodium was drained to expose the heads of S A and the bend of guide tube was measured by finding out the radius of sweep of its... 

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