Transducers and control means
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United States of America Patent
Stats
-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Jul 5, 1985
filing date -
Jul 6, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A standing wave is produced by interaction between the outputs of a pair of ultrasonic transducers driven by respective signal generating means. A phase interlock determines the phase difference between the signals and thus is progressively changed by a control signal regulated by a digital control means operated by a program so as to produce stepwise phase differences between the transducers in a cyclically varying manner. As a result, a sequence of momentary phase changes occur between the outputs of the signal generating means so that the standing wave is caused to move at a rate dependent upon the programmed operation of the digital control means.
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