Security system implemented with an anti-masking dector using light guides
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United States of America Patent
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Nov 3, 1998
Grant Date -
N/A
app pub date -
Jul 3, 1997
filing date -
Jul 4, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
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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Family
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