Measuring interface thermal resistance values by transient testing

A method is presented for detecting increased thermal resistance values within a heat conduction path with the help of transient thermal measurements. After summarizing the theoretical background of structure function evaluation it is demonstrated how to determine partial thermal resistances in the cases when one dimensional heat flow may be assumed. The paper presents a typical structure developed to measure small thermal resistance values with the help of the presented method. Simulated results demonstrate the feasibility of the suggested method, and measured examples demonstrate the applicability.