title: Thermal conductivity versus depth profiling of inhomogeneous materials using the hot disc technique.
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.
authors.affiliation: Hot Disk AB, Sven Hultins Gata 9A, SE-412 88 Gothenburg, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Sizov
authors.affiliation: Hot Disk AB, Sven Hultins Gata 9A, SE-412 88 Gothenburg, Sweden.
authors.forename: D
authors.initials: D
authors.lastname: Cederkrantz
authors.affiliation: Spinwest FoU AB, Lokattsbacken 54, SE-426 74 Gothenburg, Sweden and Närhälsan, Västra Götalandsregionen, Gothenburg, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Salmi
authors.affiliation: Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Rosén
authors.affiliation: Chalmers Industriteknik, Sven Hultins Gata 9D, SE-412 88 Gothenburg, Sweden.
authors.forename: L
authors.initials: L
authors.lastname: Jacobson
authors.affiliation: Department of Physics, University of Gothenburg, SE-412 96 Gothenburg, Sweden.
authors.forename: S E
authors.initials: SE
authors.lastname: Gustafsson
authors.affiliation: Hot Disk AB, Sven Hultins Gata 9A, SE-412 88 Gothenburg, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Gustavsson