Abstract
In laser-spot step-heating thermography the sample surface is illuminated by a focused laser beam while the surface temperature rise is monitored by an infrared video camera. By analysing the temperature profile at several instants after the laser beam is switched on, the in-plane thermal diffusivity can be obtained. In this work, we show that in thermal insulators heat conduction to the surrounding gas, which is typically neglected in this kind of experiments, plays a significant role and allows determining both thermal diffusivity and conductivity simultaneously.
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