Enhanced Transient Hot Bridge Method Using a Finite Element Analysis

摘要

This paper presents a new enhanced measuring procedure to determine the direction-dependent thermal diffusivity of anisotropic materials using the transient hot bridge technique. Two measurements with different sensor orientation are performed to ascertain the thermal diffusivities in the three spatial directions. The analysis of the measurement signals combines an analytical evaluation with a finite-element post-diction of the signal. The measurement uncertainty is assessed to 4%-10%.