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Apparatus and method for fiber optic intrusion sensing
(United States. Patent and Trademark Office, 1993-03-16)
Apparatus for sensing intrusion into a predefined perimeter comprises means for producing a coherent pulsed light, which is injected into an optical sensing fiber having a first predetermined length and positioned along ...
Signal conditioning unit for fiber optic sensors
(United States. Patent and Trademark Office, 1996-09-17)
Apparatus and method (10, 50) for determining the value of a measurand measured by a fiber optic interferometer sensor (24, 72, 110) is provided. The apparatus includes a light source (16, 58, 102) emitting a light having ...