Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1993-06-07
1995-08-08
Peng, John K.
Communications: electrical
Condition responsive indicating system
Specific condition
340527, 343894, 367 93, G08B 1318, G08B 2300, G01S 1500
Patent
active
054402905
ABSTRACT:
A proximity detection device for protection of personnel against exposure to hazardous radio frequency radiation. The device works by detecting the presence of people, either the operator or bystanders, who are in the system antenna's radio frequency radiation hazard zone. Upon detection, the device triggers a timer that delays the activation of alarm circuitry for a brief period of time. This time delay is instituted to minimize the triggering of nuisance alarms by a momentary intrusion in the hazard zone. If a presence is still detected after the delay time, pulsing visual and audible alarms are triggered to alert the system operator of the dangerous situation. The alarms remain activated for a timed period, allowing the operator to clear the hazard zone. If the system of the present invention continues to detect a presence in the radio frequency radiation hazard zone after the timed alarm period, the alarms are set in constant activation and a relay is triggered deactivating the system transmitter, thereby removing the radio frequency radiation hazard.
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Follendore, III Roy D.
McCullough Charles E.
Champagne Thomas M.
Lee Benjamin C.
Peng John K.
Roberts Jon L.
TECSEC Incorporated
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