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Advances in sapphire optical fiber sensorsWe describe the development and testing of two sapphire fiber sensor designs intended for use in high temperature environments. The first is a birefringence-balanced polarimetric sapphire fiber sensor. In this sensor, two single crystal sapphire rods, acting as the birefringence sensing element, are connected to each other in such a way that the slow axis of the first rod is aligned along with the fast axis of the second rod, and the fast axis of the first rod is along the slow axis of the second rod. This sensor has been demonstrated for measurement of temperature up to 1500 C. The second is a sapphire-fiber-based intrinsic interferometric sensor. In this sensor, a length of uncoated, unclad, structural-graded multimode sapphire fiber is fusion spliced to a singlemode silica fiber to form a Fabry-Perot cavity. The reflections from the silica-to-sapphire fiber splice and the free endface of the sapphire fiber give rise to the interfering fringe output. This sensor has been demonstrated for the measurement of temperature above 1510 C, and a resolution of 0.1 C has been obtained.
Document ID
19930053336
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Wang, Anbo
(NASA Langley Research Center Hampton, VA, United States)
Wang, George Z.
(NASA Langley Research Center Hampton, VA, United States)
Gollapudi, Sridhar
(NASA Langley Research Center Hampton, VA, United States)
May, Russell G.
(NASA Langley Research Center Hampton, VA, United States)
Murphy, Kent A.
(NASA Langley Research Center Hampton, VA, United States)
Claus, Richard O.
(Virginia Polytechnic Inst. and State Univ. Blacksburg, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: Fiber optic smart structures and skins V; Proceedings of the Meeting, Boston, MA, Sept. 8, 9, 1992 (A93-37326 14-35)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Instrumentation And Photography
Accession Number
93A37333
Funding Number(s)
CONTRACT_GRANT: NAG1-1292
CONTRACT_GRANT: NAG1-1275
Distribution Limits
Public
Copyright
Other

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