Intrusion detection system

Details Intrusion detection system Intrusion detection system

2007-04-24

2007-04-24

Le, Que Tan (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C356S003140, C348S153000, C348S154000

Reexamination Certificate

active

10750469

ABSTRACT:
An intrusion detection system comprises a pair of optical lenses arranged a predetermined distance apart and having overlapping fields of view within an area to be monitored to form a common field of view; at least one light-sensitive device responsive to light from each of the optical lenses; a range detector responsive to signals from the light-sensitive device and operable to determine a range to an object within the common field of view; and a range discriminator for setting at least one range gate to sense objects within the common field of view at predetermined ranges and for ignoring objects outside of the predetermined ranges.

REFERENCES:
patent: 3811010 (1974-05-01), Long
patent: 5045702 (1991-09-01), Mulleer
patent: 5500525 (1996-03-01), Saban
patent: 5586063 (1996-12-01), Hardin et al.
patent: 5602944 (1997-02-01), Yokoyama et al.
patent: 6853738 (2005-02-01), Nishigaki et al.

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