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Thermal conductivity versus depth profiling of inhomogeneous materials using the hot disc technique
S. E. Gustafsson, B. Suleiman, N. S. Saxena, and I. U. Haq, High Temp.–High Pressures 23, 289 (1991).
M. Gustavsson and S. E. Gustafsson, in Proceedings of the 26th International Thermal Conductivity Conference, Massachusetts, Cambridge, 6–8 August 2001, edited byR. Dinwiddie (Oak Ridge National Laboratory, Oak Ridge, Tennessee, 2004), pp. 367–377.
ISO, 22007–2, “Plastics—Determination of thermal conductivity and thermal diffusivity—Part 2: Transient plane heat source (hot disc) method.”
D. Lundström, B. Karlsson, and M. Gustavsson, Z. Metallkd. 92, 1203 (2001).
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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.
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