Advances in sapphire optical fiber sensors

Anbo Wang; George Z. Wang; Sridhar Gollapudi; Russell G. May; Kent A. Murphy; Richard O. Claus

doi:10.1117/12.141335

26 March 1993 Advances in sapphire optical fiber sensors

Anbo Wang, George Z. Wang, Sridhar Gollapudi, Russell G. May, Kent A. Murphy, Richard O. Claus

Proceedings Volume 1798, Fiber Optic Smart Structures and Skins V; (1993) https://doi.org/10.1117/12.141335
Event: Fibers '92, 1992, Boston, MA, United States

Abstract

We 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.

Citation Download Citation

Anbo Wang, George Z. Wang, Sridhar Gollapudi, Russell G. May, Kent A. Murphy, and Richard O. Claus "Advances in sapphire optical fiber sensors", Proc. SPIE 1798, Fiber Optic Smart Structures and Skins V, (26 March 1993); https://doi.org/10.1117/12.141335

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