Proximity sensor

Details Proximity sensor Proximity sensor

1976-09-07

1978-10-17

O'Dea, William F.

192 clutches and power-stop control

Stop mechanism

Safety device

192130, 340 15, 343 5PD, H04B 900

Patent

active

041203895

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: 3406802 (1968-10-01), Needham et al.
patent: 3854327 (1974-12-01), Felix
patent: 3876969 (1975-04-01), Price, Jr.
patent: 3896425 (1975-07-01), Erichsen

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