G - Physics – 08 – B
Patent
G - Physics
08
B
340/155, 340/140
G08B 19/00 (2006.01) G08B 13/18 (2006.01)
Patent
CA 1184625
FIBER OPTICS SECURITY SYSTEM ABSTRACT OF THE DISCLOSURE A fiber optics security system includes closed loop fiber optic link means which transfers energy from a radiant energy source to a radiant energy receiver. The link means includes a plurality of fiber optic links and a plurality of detectors serially connected. Cessation of energy to the receiver causes an alarm. One detector includes an optical transducer spaced a distance from, and in alignment with, a second optical transducer such that light transmitted, through air, is received by the second transducer with insignificant loss so as not to cause cessation of energy to the receiver. In a water medium, due to its absorption characteristics, light received by the second transducer is so insignificant that energy to the receiver ceases. The first transducer provides a beam of light along a straight path within a medium having a constant index of refraction to the second transducer spaced therefrom and oriented along the path so as to ordinarily receive the beam of light. When light passes through media having different indices of refraction at angles other than normal, light is refracted away, whereby energy to the receiver ceases. The media can be the same substance with different indices of refraction, or it can be of different substances. The two transducers are so spaced and oriented that the straight path therebetween is both other than horizontal and other than vertical. Another detector includes optical fiber which is stable at temperatures of up to approximately 135°F but which melts at some temperature above approximately 155°F, thereby providing for fire detection by causing cessation of energy to the receiver.
448997
Gte Laboratories Incorporated
R. William Wray & Associates
LandOfFree
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