Method and apparatus for area and perimeter security with reflec

Details Method and apparatus for area and perimeter security with reflec Method and apparatus for area and perimeter security with reflec

1988-01-21

1990-01-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 340556, G01V 904

Patent

active

048930059

ABSTRACT:
An apparatus and method for detecting disturbance in a protected area or perimeter by scanning the area or perimeter with a rotating beam of radiating energy, such as light, infrared, ultraviolet and the like, and counting the number of pulses at the output of a detector or sensor upon impingement on the detector or sensor of the beam reflected by each one of a plurality of reflectors disposed in the protected area or perimeter. Upon turning on the apparatus, a first pulse count corresponding to each complete revolution of the beam is stored as a pulse reference number for a "normal" state in the protected area or perimeter. In operation, the number of pulses for each revolution of the beam is continuously counted and compared to the stored reference number and an alarm is triggered as soon as the stored reference number and the counted number are unequal.

REFERENCES:
patent: 2269340 (1942-01-01), Gulliksen
patent: 3120654 (1964-02-01), Lee
patent: 3641549 (1972-02-01), Misek et al.
patent: 3805064 (1974-04-01), Kornylak
patent: 3955184 (1976-05-01), Cinzori et al.
patent: 3987428 (1976-10-01), Todeschin
patent: 4179691 (1979-12-01), Keller
patent: 4224608 (1980-09-01), Lederer
patent: 4310756 (1982-01-01), Sick et al.
patent: 4310836 (1982-01-01), Stanzani
patent: 4314239 (1982-02-01), Odone et al.
patent: 4319332 (1982-03-01), Mehnert

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