1 May 1994 Sapphire fiber-based polarimetric optical sensor for high-temperature applications
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Abstract
The polarization preserving properties of single crystal sapphire optical fibers are investigated experimentally for different modal power distributions and different lengths of the fibers. Experimental results indicate that linearly polarized light launched along one of the principle axes of the fiber birefringence can be partially maintained. The polarization extinction ratio at the fiber output end was measured to be 6 dB and 3 dB for 7 cm and 32 cm long sapphire fibers, respectively. The temperature coefficient of the different phase delay between the orthogonal polarization modes was measured to be 0.028 rad. m-1 degree(s)C-1. A sapphire fiber-based polarimetric temperature sensor is constructed based upon both the polarization maintaining characteristics of the sapphire fiber and the temperature dependence of birefringence-induced phase delay. In this sensor a 1.4 cm long sapphire fiber serves as the sensing element. This sensor has been demonstrated for measurement of high temperature up to 1200 degree(s)C with a resolution of 2 degree(s)C.
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Anbo Wang, Pinyi Zhang, Russell G. May, Kent A. Murphy, Richard O. Claus, "Sapphire fiber-based polarimetric optical sensor for high-temperature applications", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); doi: 10.1117/12.173942; https://doi.org/10.1117/12.173942
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