Security system implemented with an anti-masking dector using li

Details Security system implemented with an anti-masking dector using li Security system implemented with an anti-masking dector using li

1997-07-03

1998-11-03

Mullen, Jr., Thomas J.

Communications: electrical

Condition responsive indicating system

Specific condition

250DIG1, 340506, 340693, 385 12, G08B 1318

Patent

active

058315292

ABSTRACT:
A surveillance system comprising a motion detector is secured by a security system comprising a light emitter and light receiver optically coupled to light guides positioned, for example, along the circumference of a light-transmitting window that covers the motion detector. In this manner the window is secured against damage or attack on its integrity, for example, in the form of a film covering or sprayed on the window. The security system delivers an alarm signal when the detected light intensity level is too low or too high.

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U.S. Statutory Invention Registration H376, James Bremer, "Degradation Monitor for Laser Optics", Dec. 1987.

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