Intruder detection

Details Intruder detection Intruder detection

1983-09-23

1985-08-13

Smith, Alfred E.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

350452, B42F 1300

Patent

active

045352402

ABSTRACT:
The invention relates to an intruder detector for use in a burglary in which infra-red radiation is imaged onto a sensor 16. The imaging system, which serves to divide the area of surveillance into monitored and unmonitored zones and to focus the radiation onto the sensor, consists of a window 12 constructed as a flat one-piece segmented Fresnel lens, each segment 12a, 12b and 12c focusing energy from a different respective monitored zone onto the sensor 16. The lens is double sided with one side acting as a convex lens and the other as a set of deflecting prisms.

REFERENCES:
patent: 3203306 (1965-08-01), Lefferts
patent: 4050782 (1977-09-01), Uchida et al.
patent: 4321594 (1982-03-01), Galvin et al.

Affiliated with

Also associated with

Rating

Intruder detection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Intruder detection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Intruder detection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2320156