Extracting model parameters from thermal transient measurements for thermal stress simulation

In this article it is presented how structural information and temperature distribution can be calculated from thermal transient measurement results. We show how the temperature distribution can be approximated from a time domain temperature transient using simple calculations and that not only the temperatures but the geometry of a three dimensional model can also be calculated from the thermal RC network. The identification method is demonstrated using the measurement results of a simple package structure and the source and magnitude of uncertainties are also investigated.