Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-03-18
1987-03-31
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73800, 250231R, 250231P, 350 9615, 350 9623, 350 9629, 356 32, G01L 124
Patent
active
046545204
ABSTRACT:
An optical fiber is securely and continuously fastened to a structure such as a pipeline, offshore platform, bridge, building, dam or even a natural object. A light signal is passed into one end of the optical fiber. Any physical movement of the structure, or sectional movements along the optical fiber path, such as deflection, bending, displacement (changes in linear uniformity) or fracture of the structure will necessarily affect the optical fiber. As a consequence, detectable changes will occur in the "electro-optic signature" (for measurements made at the input end of the optical fiber) or in the light signal transmission (for measurements made at the opposite end of the optical fiber). Such measurements made at the input include reflections resulting from Rayleigh back-scattering and can be periodically or continuously made to determine the magnitude and location of the aforementioned physical movements of the structure. In addition, by utilizing additional optical fibers, the direction and rate, i.e., dynamics, of such physical movements can be determined. The optical fiber itself can be used as a communication link for the transmission of data and voice.
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