Numerical processing of thin-film sensor temperature data

A thin-film sensor operating in transient mode in principle enables very accurate temperature measurements to be obtained, e. g. in turbine blades, 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 I-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 for the design of an experiment on a rational basis.