Sensitivity and Accuracy Analysis of Pulse Diffusivity Measurements on Layered Samples
Measurement by the laser pulse technique of the thermal diffusivity of an unknown layer in a planar layered sample consisting of two or three materials requires knowledge of the thermal properties and thicknesses of the remaining sample layers. This paper examines the sensitivity of the technique to uncertainties in the known parameters of the adjacent layers, and applies the results of the sensitivity analysis to the topic of sample selection and assessment of the overall accuracy of the calculated thermal diffusivity. Methods of estimating and bounding the error in the calculated diffusivity are also discussed. Finally, some typical cases for two- and three-layer samples are presented, and some observations regarding the cases are discussed.
KeywordsThermal Diffusivity Sensitivity Coefficient Stainless Steel Substrate Back Face Back Layer
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