Intrusion detection method and apparatus

Details Intrusion detection method and apparatus Intrusion detection method and apparatus

1978-11-09

1980-12-30

Trafton, David L.

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

G08B 1316

Patent

active

042427436

ABSTRACT:
A pulse echo intrusion detection method and apparatus is described wherein a reference parameter is automatically established which is representative of an interval of time elapsed during initial projection and reflection of pulse energy between a source and a receiver. The reference parameter is periodically compared with successive pulse projection and reflection time measurements in order to sense variations indicative of a changed environment such as might be caused by the presence of an intruding object.

REFERENCES:
patent: 3562703 (1971-02-01), Grada
patent: 3686658 (1972-08-01), Wilt
patent: 3713126 (1973-01-01), Stettner
patent: 3739325 (1973-06-01), Ludwig
patent: 4016529 (1977-04-01), Inuzuka et al.

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