Optical waveguides – Optical waveguide sensor
Reexamination Certificate
2006-02-14
2006-02-14
Assaf, Fayez G. (Department: 2872)
Optical waveguides
Optical waveguide sensor
C385S013000, C385S005000, C385S104000, C356S032000, C356S004010
Reexamination Certificate
active
06999641
ABSTRACT:
A method for the direct measurement of large strains in ropes in situ using a plastic optical fiber, for example, perfluorocarbon or polymethyl methacrylate and Optical Time-Domain Reflectometer or other light time-of-flight measurement instrumentation. Protective sheaths and guides are incorporated to protect the plastic optical fiber. In one embodiment, a small rope is braided around the plastic optical fiber to impose lateral compressive forces to restrain the plastic optical fiber from slipping and thus experience the same strain as the rope. Methods are described for making reflective interfaces along the length of the plastic optical fiber and to provide the capability to measure strain within discrete segments of the rope. Interpretation of the data allows one to calculate the accumulated strain at any point in time and to determine if the rope has experienced local damage.
REFERENCES:
patent: 5182779 (1993-01-01), D'Agostino et al.
patent: 5649035 (1997-07-01), Zimmerman et al.
patent: 6246469 (2001-06-01), Schier
patent: 2003/0094281 (2003-05-01), Tubel
Muhs Jeffrey David
Smith David Barton
Williams Jerry Gene
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