Transient infrared thermography to characterize thermal properties of millimeter-sized low conductivity materials

Abstract

This work deals with the thermal characterization of a low conductivity material of millimeter-sized used mainly in building insulation, the hemp shiv. Experimentally, the samples are positioned in a stainless steel chamber, in which it is possible to control the environment. They are heated during few seconds on one side and an infrared camera measures the temperature field of the sample surface. The experimental thermograms are compared with a theoretical estimation model derived from the fin model in order to estimate simultaneously two parameters by ordinary least-squares regression: the thermal diffusivity and a modified Biot number.