Proximity sensor

Details Proximity sensor Proximity sensor

1977-02-07

1978-08-22

Farley, Richard A.

Communications: electrical

Selective

Having electron beam device

100 53, 181175, 340553, 343 5PD, H04B 1100

Patent

active

041092333

ABSTRACT:
An energy curtain is formed by exciting high order beam modes in an open resonant cavity. Depending on mode number, the energy resonates in a mathematically determined pattern. A detector senses changes in the resonant condition caused by the presence of an object in the pattern. The apparatus may be used in a variety of applications, including the protection of a machine operator from a hazardous area of a machine, parts counting, and intrusion detection.

REFERENCES:
patent: 3599196 (1971-08-01), Boyko
patent: 3854327 (1974-12-01), Felix
patent: 3896425 (1975-07-01), Erichsen
patent: 3948350 (1976-04-01), Erickson
patent: 3979695 (1976-09-01), Erickson

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