Monitoring devices and intrusion surveillance devices

Details Monitoring devices and intrusion surveillance devices Monitoring devices and intrusion surveillance devices

2006-06-16

2008-08-19

Epps, Georgia Y. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C340S539310, C340S555000

Reexamination Certificate

active

07414236

ABSTRACT:
A security surveillance device that includes an electromagnetic wave sensor for sensing an electromagnetic wave of an external electromagnetic wave source and an anti-tampering arrangement. The anti-tampering arrangement includes a detection window forming a partition between the external electromagnetic wave source and the electromagnetic wave sensor, the detection window includes an outer corrugated surface facing the electromagnetic wave source; an optical arrangement for deploying an optical surveillance beam which is arranged to undergo multiple reflections at the outer corrugated surface of the detection window is provided and the surveillance beam loop is monitored by a control circuitry to monitor tampering.

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International Search Report Application No. PCT/CN2007/001711 dated Sep. 6, 2007.

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