Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1982-03-31
1985-08-27
Myracle, Jerry W.
Communications: electrical
Condition responsive indicating system
Specific condition
340566, G08B 1300
Patent
active
045381402
ABSTRACT:
An intrusion detection system for sensing mechanical and acoustical vibrations, comprises a light source, a fiber optic acoustic transducer, a light intensity to current converter circuit, a display and an audio monitor. The light source is positioned at a point remote from an area to be protected and is coupled to the fiber optic acoustic transducer by a low loss fiber optic transmission line. Similarly, the light intensity to current converter circuit, the display and the audio monitor are located at a point remote from the area to be protected, and are coupled to the fiber optic acoustic transducer by a low loss fiber optic transmission line. When mechanical or acoustical vibrations impinge on the fiber optic acoustic transducer it modulates the intensity of the light beam generated by the light source, thereby causing the system to generate both a visual and audio indication that an intrusion is taking place. Since the system emits no radiation, (e.g. thermal, electrical, acoustical, electro-magnetic etc.) and can be embedded in walls, floors, etc. it is not readily detectable by an intruder and hence can not be disabled or avoided by the intruder.
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Gould Inc.
Myracle Jerry W.
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