Fiber-sensor design for turbine engines*

Kenneth W. Tobin

doi:10.1117/12.2321921

1 December 1991 Fiber-sensor design for turbine engines*

Kenneth W. Tobin

Proceedings Volume 1584, Fiber Optic and Laser Sensors IX; (1991) https://doi.org/10.1117/12.2321921
Event: OE Fiber, 1991, Boston, MA, United States

Abstract

Determination of blade temperatures in the high-speed and turbulent environment of a turbine engine is difficult using standard pyrometry techniques because of the presence of high-temperature flame and the reflective nature of the inspection surfaces. A technique utilizing thermographic phosphor compounds bonded to engine vanes and turbine blades is presented that mitigates the negative effects of blackbody radiation while potentially allowing near real-time acquisition of blade temperature information. Specialized single and dual fiber-optic probes were designed to interrogate both fixed and rotating surfaces by delivering ultraviolet light from a quadrupled Nd:YAG (266 nm) laser to phosphor coatings consisting of Y₂O₃:Eu, YVO₄:Eu, and YAG:Th ceramic compounds. This technique utilizes the temperature-dependent fluorescent emission of a ceramic phosphor coating to discern the temperature of the interrogated surface. By using these methods, surface temperature measurements to 1200°C are achievable in the combustion environment.

Citation Download Citation

Kenneth W. Tobin "Fiber-sensor design for turbine engines*", Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); https://doi.org/10.1117/12.2321921

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