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 and demonstrated excellent reproducibility. An accuracy of 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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