Simultaneous Short and Long Wavelength Infrared Pyrometer Measurements in a Heavy Duty Gas Turbine

Advanced thermal barrier coatings (TBCs) are increasingly being used in high performance turbine engines. For optimized use of the coatings, accurate surface temperature measurements are required in the combustion environment. Current on-engine pyrometers, which use short infrared wavelengths to accurately measure the temperatures of metal surfaces, show increased uncertainties when used on TBCs. Studies have suggested that long infrared wavelengths are a suitable alternative. Therefore, to evaluate the response of both wavelength regions, simultaneous measurements with short and long wavelength infrared pyrometers have been accomplished in the first stage turbine of a Siemens V84.3A 60Hz 180MW engine at the Berlin Gas Turbine Development and Manufacturing Center.