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US 4,308,530 AGranted
Detection system forming wide gates with superior spatial selectivity
AssigneeN.V. Nederlandsche Apparatenfabriek NEDAP
InventorsHarm J. Kip, Tallienco W. H. Fockens
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Abstract
A detection system comprises at least one gate including transmitter means for forming a magnetic field and receiver means for receiving a signal transmitted by a detecting wafer provided with an oscillating circuit, wherein each gate comprises at least two spatial detection zones.
Claims26
A detection system comprising at least one gate including:
- transmitter means for transmitting a first signal,
- detection wafer means for receiving said first signal and responsive thereto for retransmitting said first signal to provide a second signal, and
- receiver means for receiving said second signal retransmitted by said detection wafer means, said detection wafer means including an oscillating circuit;
- wherein each said at least one gate comprises at least two spatial detection zones directly adjoining one another with no barrier therebetween.
1 more element
Dependencies are inferred from the claim text.