Optical waveguides – Optical waveguide sensor
Patent
1995-07-26
1997-01-14
Lee, John D.
Optical waveguides
Optical waveguide sensor
73800, 25022714, G01L 124
Patent
active
055948197
ABSTRACT:
A metallized glass fiber optic is braze-bonded or solder-bonded to a metal shim to form a sensor unit that may be spot welded to a structure for monitoring structural strain. Preferably shim thermal characteristics are selected to match those of the structure being monitored, and a cover plate protects the fiber after attachment to the shim. Alternatively, a non-metallized optical fiber is attached to the metal shim using a special ceramic adhesive coat whose metal constituents thermally match the thermal expansion co-efficient of the shim. After adhesive curing, a protective cover plate is attached. An embodiment for use with an extrinsic Fabry-Perot type sensor provides a metal plate with a fiber-sized groove that guides the target and the transmit/receive fiber optic elements together to form an air gap. Another embodiment metallizes the fiber optic elements with a mask ring having a depressed region into which a cover plate is attached. Each of the embodiments may be used with a white light interferometer to provide long term strain measurements at temperatures up to about 1,000.degree. F., and may be used in radiation environments.
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Narendran Nadarajah
Weiss Joseph M.
Electric Power Research Institute
Kaufman, Esq. Michael A.
Lee John D.
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