Table 4.

Overview of the limitations of the temperature measurement techniques in gas turbines. Taken from Feist et al. [22].

Method	Disadvantage/Limitation
Thermocouples	Intrusive Limited number Costly installation Bonding to ceramic surfaces Electromagnetic Interference Difficult to use on rotating components
Thermal Paints	Intrusive Time consuming (calibration and experiment) Irreversible Discrete values and poor resolutionCostly
Pyrometry	Sensitive to stray light Changes in emissivity Translucency of ceramic coatings Cleanness of optics
Thermographic Phosphor	Decreasing signals with increasing temperatures Bonding of the phosphor Phosphor coating can be intrusive