Author(s)

R. Model & U. Hammerschmidt

Abstract

Numerical methods for the determination of thermal properties by means of transient measurements R. Model * & U. Hammerschmidt^ Physikalisch-Technische Bundesanstalt, * Berlin and* Braunschweig Abstract The determination of the thermal transport properties is realized by indirect measurements and a subsequent data analysis by solving an inverse problem. Measurements were executed by the Transient Hot Strip (THS) or the Transient Hot Wire (TWS) method. The measured transient voltage drop of an embedded thin metal foil or wire is related to the thermal conductivity and diffusivity by the time-de-pendent heat conduction equation. The resulting parameter identification was solved in two ways. On the one hand, in idealized case, an analytic approxi- mation of the solution heat conduction equation is used for a linear procedure. When the conditions of the simplified model are checked very carefully, these solutions found are suitable for a parameter fit. Especially a reliable estimation of the

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