Method of and a device for sensing objects

Details Method of and a device for sensing objects Method of and a device for sensing objects

1982-04-30

1984-09-25

Gill, James J.

Communications: electrical

Condition responsive indicating system

Specific condition

340675, 367 93, 73579, G08B 2100, G01R 2726

Patent

active

044738226

ABSTRACT:
A single ultrasonic generator is employed for detecting objects, particularly copies processed in photographic devices. The sound-radiating surface of the generator is spaced apart from a reference plane about a distance equal to an integer multiple of half the wavelength of the ultrasonic waves. The changes of damping of the ultrasonic resonance circuit resulting from the acoustic load variations are measured in an electronic evaluation circuit.

REFERENCES:
patent: 3646372 (1972-02-01), Snellman et al.
patent: 3960007 (1976-06-01), Swensen
patent: 4227182 (1980-10-01), Ogasawara et al.
patent: 4368438 (1983-01-01), Stienstra

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