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Not Available A novel concept for a sapphire fiber-optic temperature sensor with microsecond response time and maximum operating temperature a-s high as 2,000 C is proposed. Two approaches, both based on optically excited fluorescence from the sensors, will be evaluated. Data will be obtained in the Phase 1 program to enable the selection of one of the approaches for further development. Preliminary investigations will also be conducted to optimize the fabrication procedure for the sensor's probe. The sensor will be shock resistant, minimally intrusive, immune to electromagnetic interference, and not sensitive to the configuration of the system to be diagnosed. It will have submillimeter spatial resolution and the ability to operate in a fluid environment. The Phase I work will result in a baseline design for a prototype of the temperature measurement system.