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INTRUDER DETECTION APPARATUS

  • US 3,610,822 A
  • Filed: 03/17/1969
  • Issued: 10/05/1971
  • Est. Priority Date: 03/20/1968
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting movement in a region, comprising:

  • a. at least one pickup tube arranged to repetitively scan the region to produce video signals dependent on radiation received from said region, b. means for operating on said video signals for deriving a plurality of second signals which are dependent on changes from one scan to a later scan in the radiation from respective portions of said region, c. means for passing each second signal to a threshold circuit having a threshold individual to the respective portion, and d. means for producing an alarm signal when any of said second signals exceeds a respective threshold.

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