High-temperature phosphor thermometry of rotating turbine blades

Abstract

Remote-temperature sensing using thermal phosphors is being developed as a nonintrusive technique for monitoring and analyzing the high-temperature, highly corrosive environments of turbomachinery. Proof-of-principle tests were conducted on phosphor-coated turbine blades that were rotating at low speeds and were immersed in a jet fuel flame. A pulsed nitrogen laser produced fluorescence from the applied phosphor. A simple optical scheme collected this emission, and a digital oscilloscope extracted from the signal the temperature-dependent decay rate. Time-dependent temperature measurements demonstrated the transient capabilities of the thermophosphor technique