Gas turbines with turbine inlet temperatures of 2500 to 3000 F are planned for the future. A critical element of the advanced controls needed for a turbine of this type is the turbine inlet temperature sensor to protect vital engine hardware and the registration of gas temperature for power controls. The paper discusses the requirements for high temperature sensor advancements, since currently developed sensors have short life, slow response, and are not sufficiently accurate. Considerable discussion is devoted to the capabilities of two different types of thermocouples and a radiation pyrometer to sense turbine hardware. Innovative concepts, such as a gas collimator lens, the use of fiber optics to avoid environmental test temperature, effects of combustion gases on radiant intensity, and emissivity changes on indicated temperature are discussed.

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