Automated photoelasticity: weighted least-squares determination of field stresses

An excimer laser-based system for mapping the surface temperature of turbine engine parts coated with thermographic phosphors has been developed. The intensities measured for Y(2)O(3):Eu over the temperature range ~500-750(degree)C are presented. In addition, the data correction and error analysis algorithm is discussed. The overall accuracy of this intensitybased surface temperature measurement technique was estimated to be ±5%. Furthermore, surface temperature measurements obtained from a ceramic matrix composite and superalloy components are presented.