Accession Number : ADD001504

Title :   Intrusion Detection Apparatus.

Descriptive Note : Patent,


Personal Author(s) : Long,David T

Report Date : 14 May 1974

Pagination or Media Count : 8

Abstract : The patent describes an intrusion detection apparatus employing two spaced-apart TV cameras having lines of observation which intersect to form a three dimensional monitored locale of interest and a TV monitor having a display tube and connected to respond to output signals from said TV cameras. The cameras and monitors being synchronized to identify the presence and location of an intruder object in said locale of interest. In another aspect the invention comparator-adder analyzing circuitry is provided between the cameras and monitor such that the monitor is actuated only when the video from both cameras is identical at a given instant. Assuming each camera is directed to observe a different background and that the focus is adjusted to substantially eliminate background signals, then only signals from the intruder object are observed and it is observed only in the monitored locale.

Descriptors :   *Intrusion detectors, *Television systems, *Patents, Monitors, Television cameras, Comparators, Synchronization(Electronics), Intrusion detection, Monitoring, Warning systems, Electrooptics

Subject Categories : Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE