11 January 1999 Absolute sapphire optical fiber interferometric sensors
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Abstract
Sapphire optical fiber sensor are greatly promising for high temperature sensing applications because of their high melting point, which exceeds 2000 degrees C. The extrinsic Fabry-Perot interferometric (EFPI) sapphire fiber sensors, based on absolute white light spectrum scanning signal processing, are extremely attractive in engineering applications because they do not require initialization and/or calibration when the system is turned on. Furthermore, it is not necessary to operate them in linear regions to avoid nonlinear effects, a significant problem in other EFPI sensor. In this paper, we use a single-crystal sapphire fiber for making an EFPI sensor. Interference fringes were observed by using both laser and light emitting diode sources. The effect of the lead-in fiber diameter on fringe visibility is also discussed.
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Hai Xiao, Hai Xiao, Y. Xie, Y. Xie, Jiangdong Deng, Jiangdong Deng, Russell G. May, Russell G. May, Anbo Wang, Anbo Wang, } "Absolute sapphire optical fiber interferometric sensors", Proc. SPIE 3538, Process Monitoring with Optical Fibers and Harsh Environment Sensors, (11 January 1999); doi: 10.1117/12.335736; https://doi.org/10.1117/12.335736
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