20 May 2013 Optical sapphire fiber Bragg gratings as high temperature sensors
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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87940B (2013) https://doi.org/10.1117/12.2026074
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
Abstract
Fiber Bragg gratings (FBG) were inscribed in single crystalline sapphire fibers by fs-laser irradiation. Due to the used multi-mode air clad fiber a sapphire-FBG spectra showa a wide asymmetric peak with a half width of 7 nm. Different mathematical peak functions were tested to determine a fiber Bragg wavelength. It was shown that the shift of the calculated Bragg wavelengths in dependence on temperature is identical for the different peak functions. The determination of the fiber Bragg wavelength shift with a resolution of 10pm allows temperature measurements within an accuracy of ±1°C in the temperature range up to 1500°C. Sapphire FBG were used to measure the temperature distribution and thermal fluctuations within an inductive heated furnace in the range from 100°C to 1500°C.
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Tobias Habisreuther, Tino Elsmann, Zhiwen Pan, Albrecht Graf, Hans-Joachim Pißler, Manfred Rothhardt, Reinhardt Willsch, Hartmut Bartelt, Markus A. Schmidt, "Optical sapphire fiber Bragg gratings as high temperature sensors", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87940B (20 May 2013); doi: 10.1117/12.2026074; https://doi.org/10.1117/12.2026074
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