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Thermal conductivity versus depth profiling of inhomogeneous materials using the hot disc technique

Journal article
Authors A. Sizov
D. Cederkrantz
L. Salmi
Arne Rosen
L. Jacobson
S. E. Gustafsson
M. Gustavsson
Published in Review of Scientific Instruments
Volume 87
Issue 7
Pages artikelnr 074901
ISSN 0034-6748
Publication year 2016
Published at Department of Physics (GU)
Pages artikelnr 074901
Language en
Links dx.doi.org/10.1063/1.4954972
Keywords strip method, diffusivity, solids, heat, Instruments & Instrumentation, Physics
Subject categories Physical Sciences

Abstract

Transient measurements of thermal conductivity are performed with hot disc sensors on samples having a thermal conductivity variation adjacent to the sample surface. A modified computational approach is introduced, which provides a method of connecting the time-variable to a corresponding depth-position. This allows highly approximate-yet reproducible-estimations of the thermal conductivity vs. depth. Tests are made on samples incorporating different degrees of sharp structural defects at a certain depth position inside a sample. The proposed methodology opens up new possibilities to perform non-destructive testing; for instance, verifying thermal conductivity homogeneity in a sample, or estimating the thickness of a deviating zone near the sample surface (such as a skin tumor), or testing for presence of other defects. (C) 2016 Author(s).

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