Thermographic data is typically analyzed in terms of thermal time of light methods. Information regarding the depth of flaws in metal an composite materials can be obtained in this manner. Small discrepancies between experimental data and actual depth of flaw have been observed when the flaw diameter varies while the depth remains constant. The slope of the rising portion of the contrast curve has been shown to be more insensitive to these types of effects. Most of these types of analysis are empirical in nature and strongly depend on the material being studied. Simple calorimetric arguments have recently been derived which also allow for the deviation of the same depth information but at the same time provide more insight into the thermographic process. In this talk these simple calorimetric arguments will be presented and correlated to experimental results from samples with various flat bottom holes. Results on Al and polymer matrix composites will be presented.