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Detection system forming wide gates with superior spatial selectivity

  • US 4,308,530 A
  • Filed: 05/10/1978
  • Issued: 12/29/1981
  • Est. Priority Date: 07/19/1977
  • Status: Expired due to Term
First Claim
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1. 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, andreceiver 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.

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