The extremely thin sample and the resulting extremely short measuring time push the LFA using the conventional vertical measurement method (Through-Plane) to its limits. To be able to measure such thin samples a horizontal measurement method with the in-plane adapter can be used.

The measurement of the thin steel foil was performed from room temperature to 1200 °C. From room temperature to 900 °C the thermal diffusivity increases with temperature. A rapid increase of the thermal diffusivity can be seen between 900 °C and 1000 °C. Here, the sample starts to melt which results in a drastic thermal diffusivity change. Further increase in temperature leads to a decrease in thermal diffusivity.