Abstract

We present a fiber-optic temperature sensor with a single-crystal sapphire fiber as the light guide and a sapphire wafer as the sensing element. Temperature is determined by measurement of the thermal dependence of the wafer’s optical thickness by use of white-light interferometry. We applied digital signal processing techniques to analyze the sensor’s spectrum. A prototype sensor was tested to $1600°\mathrm{C}$ and demonstrated excellent reproducibility. An accuracy of $\pm 0.2\%$ full scale was obtained. The sensor is simple, small, and flexible, with potential advantages of batch fabrication and easy calibration.

© 2005 Optical Society of America

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