Porosity Determination by Pulsed Thermography in Reflection Mode
G. Mayr, G. Hendorfer - Porosity Determination by Pulsed Thermography in Reflection Mode - Proceedings of QIRT 2010, Quebec, Kanada, 2010, pp. 933-940
In this work we measure the thermal diffusivity of a series of porous carbon fibre reinforced plastics specimens
using pulsed thermography in reflection mode. These diffusivity values are compared with porosity values derived by means
of computed tomography. In addition, numerical simulations of the heat transfer are performed using a finite-element
program. The simulation shows that the effective thermal diffusivity values derived in reflection mode scatter more than the
transmission results especially at low porosity. Furthermore, for porosities higher than 10 percent the sensitivity for both
methods decreases. The experimental results are similar to those seen in the numerical study.