Transducers and control means

Details Transducers and control means Transducers and control means

1985-07-05

1987-08-18

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Transmitter systems

367138, 181 05, H04B 102

Patent

active

046881999

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.

REFERENCES:
patent: 3626267 (1971-12-01), Bobbitt
patent: 4167753 (1979-09-01), Lynk
patent: 4398275 (1983-08-01), Zehner

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