×

Perimeter sensing device

  • US 5,650,623 A
  • Filed: 12/04/1995
  • Issued: 07/22/1997
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Fees
First Claim
Patent Images

1. A perimeter monitoring device for detecting passage of an intruding object within a monitored space above a perimeter line around a cordoned area, the perimeter sensing device comprising:

  • at least a first and a second electrically conductive sensor element disposed along said perimeter line, each of said sensor elements being electrically insulated from the other; and

    an electrical charge sensing processing unit coupled respectively to each of said sensor elements so as to detect respective electrical currents generated in each of said sensor elements from the movement of said intruding object past said respective sensor elements within said monitored space;

    said processing unit further comprising a respective voltage source coupled to each of said sensor elements, each respective voltage source being maintained at an electrical potential different from the other voltage sources.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×