Intruder-detection system for room security

Details Intruder-detection system for room security Intruder-detection system for room security

1985-12-19

1988-07-26

Orsino, Joseph A.

Communications: electrical

Condition responsive indicating system

Specific condition

250221, 340552, G08B 1318

Patent

active

047603810

ABSTRACT:
In this system for the securing of rooms, one or more transmitting elements emit suitably modulated light pulses into given regions or sectors which are produced by specially shaped optical components and/or by a special alignment of the transmitting elements and/or by the application of absorbent layers to an infrared filter which is located in front of the transmitting elements and receiving elements. One or more receiving elements receive the incident radiation. Changes in the radiation field with respect to intensity and/or speed of change of the intensity and/or phase are processed in subsequent evaluation logic circuitry. The room security system can also be combined into a larger unit with common evaluation logic.

REFERENCES:
patent: 2198725 (1937-12-01), Smith
patent: 3444544 (1969-05-01), Pearson et al.
patent: 3858043 (1974-12-01), Sick et al.
patent: 3958118 (1976-05-01), Schwarz
patent: 4479053 (1984-10-01), Johnston
patent: 4656462 (1987-04-01), Araki et al.

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