Numerical processing of thin film sensor temperature data

A thin-film sensor operated in transient mode in principle enables very accurate temperature measurements, e. g. in turbine blades, to be obtained because of the high frequency of its response; however, the complexity of data processing is the major drawback for popular use of the sensor. In this study new data processing methods are presented, including a comprehensive 1--D finite element model which is convenient both for its capability of dealing with general boundary conditions and for the low computational cost as compared to present transform--based methods. This method can also tackle single--, double-- and multi--layer sensors, can support temperature dependent quantities and proves successful in processing prototype signals in a wide range of Mach numbers. A new procedure is also proposed, which is useful to design an experiment on rational basis.