Self oscillating acoustic displacement detector

Details Self oscillating acoustic displacement detector Self oscillating acoustic displacement detector

1981-10-01

1983-12-13

Heyman, John S.

Oscillators

With device responsive to external physical condition

310316, 310335, 340686, 324327, 328 5, H01L 4102, G01R 2312, G01S 172

Patent

active

044207271

ABSTRACT:
The present disclosure describes a system for detecting very small displacements of an object with respect to a self oscillating piezoelectric crystal by means of acoustic interference at the crystal. Acoustic energy transmitted by the oscillator is reflected by the object, and movement of the latter causes changes in the phase of the reflected energy. Such changes in turn result in variations in the amplitude of the oscillations. An electronic circuit responsive to the last mentioned variations generates output signals indicative of the instantaneous position of the object.

REFERENCES:
patent: 3379994 (1968-04-01), Foster
patent: 4271371 (1981-06-01), Furuichi et al.
patent: 4310807 (1982-01-01), McKee

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