Numerical Methods For The Determination Of Thermal Properties By
Means Of Transient Measurements
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
Keywords
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