Abstract: 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$DGR@C, and a resolution of 0.1$DGR@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. !10
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