Accession Number : ADD013164

Title :   Near Ultrasonic Pattern Comparison Intrusion Detector.

Descriptive Note : Patent, Filed 24 Jun 85, patented 27 Jan 87,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Leverance,Robert A ; Longas,Socrates A

Report Date : 27 Jan 1987

Pagination or Media Count : 7

Abstract : An intrusion detector is configured to transmit signal(s) of a very short duration and then process the returned signal(s) reflected from various surfaces and objects within the propagation path in a room to be secured. The return signal(s) is a succession of peaks whose return times represent the location of respective objects. As configured, the intrusion detector apparatus includes, inter alia, a microprocessor that stores processed facsimiles of the return signal(s) for an unoccupied room and continually makes comparisons with subsequent returned signal(s). When the returned signal(s) changes, as a result of an unauthorized entry into the room, for example, a visual and/or audible alarm indication is produced.

Descriptors :   *PATENTS, *INTRUSION DETECTION, PERSONNEL DETECTORS, MICROPROCESSORS

Subject Categories : Miscellaneous Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE