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Proceedings Paper

Fiber-sensor design for turbine engines*
Author(s): Kenneth W. Tobin
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Paper 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.

Paper Details

Date Published: 1 December 1991
Proc. SPIE 1584, Fiber Optic and Laser Sensors IX, (1 December 1991); doi: 10.1117/12.2321921
Show Author Affiliations
Kenneth W. Tobin, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 1584:
Fiber Optic and Laser Sensors IX
Ramon P. DePaula; Eric Udd, Editor(s)

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