Optics: measuring and testing – Material strain analysis – By light interference detector
Patent
1992-06-24
1994-10-11
Turner, Samuel A.
Optics: measuring and testing
Material strain analysis
By light interference detector
356345, 25022719, G01B 902
Patent
active
053552083
ABSTRACT:
A distributed fiber optic sensing system for detecting mechanical, acoustic, or ultrasonic disturbances is disclosed. This system is optimized for use as an intrusion detection system in security applications. Light is launched into opposite ends of a sensing fiber loop such that two beams circulate through the loop in opposite directions and then recombine to produce an interference pattern on a photoelectric detector. Disturbances of the sensing fiber loop produce corresponding changes in the interference pattern and thereby the signal level at the detecter. The changes in the electrical signal from the detector are interpreted to provide alarms when the sensing fiber loop is impinged upon by intrusive disturbances, and to provide location of disturbances along the loop. Means are incorporated to decode uniquely coded sonic or ultrasonic signals from personal transmitters borne by authorized personnel approaching the sensing fiber loop. A remotely activated system disturber is affixed to the sensing fiber loop which, when activated by an operator, provides positive confirmation of sensing loop continuity and system operability.
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Crawford Brian B.
Prenovost Robert J.
Reil Jimmy L.
Robinson Jeff C.
Collins Roy P.
Mason & Hanger National, Inc.
Turner Samuel A.
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