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12 July 1993 Sapphire-optical-fiber-based interferometric sensors for high-temperature environmental applications
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We describe the development and testing of intrinsic and extrinsic sapphire fiber-based sensor designs intended for use in high temperature environments. The first is a sapphire-fiber-based intrinsic interferometric sensor. In this sensor, a length of uncoated, unclad, structural-grade 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 degree(s)C, and a resolution of 0.1 degree(s)C has been obtained. The second is an extrinsic sapphire fiber-based Fabry-Perot interferometer. Based on the intrinsic sapphire fiber sensor, another sapphire fiber is placed end-to-end to the first sapphire fiber and the two adjacent endfaces of the two sapphire fibers form a Fabry- Perot cavity. This sensor has been shown to be useful for strain and temperature measurement.
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Anbo Wang, Sridhar Gollapudi, Russell G. May, Kent A. Murphy, and Richard O. Claus "Sapphire-optical-fiber-based interferometric sensors for high-temperature environmental applications", Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993);

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