Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1976-06-18
1980-08-26
Caldwell, Sr., John W.
Communications: electrical
Condition responsive indicating system
Specific condition
340 38R, 343771, G08B 1324, G08G 101
Patent
active
042198020
ABSTRACT:
A scanning barrier which can detect and discriminate objects which are within the scanned area. A transmitter on one side of the scanned area transmits a laminar barrage of electromagnetic microwaves across the scanned area. The laminar barrage of electromagnetic microwaves have a thin width and a predetermined height. A receiver across the scanned area receives the microwaves. The receiver is formed of a plurality of vertically adjacent elemental receivers which divide the laminar barrage into a series of horizontal slices. A logic circuit is connected to each of the elemental receivers and can detect the interruption of the laminar barrage to that elemental receiver.
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"Radar, Acoustic, and Magnetic Vehicle Detectors", Barker, IEEE Transactions, 2-70, pp. 30-43.
"Autostrade"-Concessioni e Costruzioni Autostrade S.p.A.
Caldwell Sr. John W.
Groody James J.
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