Detection system

Details Detection system Detection system

1978-04-25

1981-12-01

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

340568, 343 65SS, G08B 1314, G08B 1324

Patent

active

043039103

ABSTRACT:
A system for monitoring the position of a receptor reradiator in a surveillance zone having a first means for transmitting a first signal through the zone, and a receptor reradiator operable in response to reception of said signal to radiate at least one reply signal which is a function of the first signal and of the position of said receptor reradiator in the zone. There is also a receiver for receiving the reply signal, means controlled by the receiver, dependent upon the reply signal to indicate the position of the receptor reradiator in the zone, and an alarm triggerable by the receiver responsive to the latter for receiving the reply signals.

REFERENCES:
patent: 3518546 (1970-06-01), Augenblick et al.
patent: 3806905 (1974-04-01), Strenglein
patent: 3863244 (1975-01-01), Lichtblau
patent: 3922678 (1975-11-01), Frenkel
patent: 3938125 (1976-02-01), Benassi
patent: 3961322 (1976-06-01), Lichtblau
patent: 3983552 (1976-09-01), Bakeman et al.
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4139844 (1979-02-01), Reeder

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