Thermal characterization of vertical interface by scanning photothermal radiometry.

In this work, scanning photothermal radiometry is used for imaging and to characterize a submicron crack. From the thermal images, the evolution of the crack is mapped in the space with micrometer resolution. A vertical contact interface at the steel-steel junction is used to represent a micro-crack with a thickness less than 0.

Thermal imaging by scanning photothermal radiometry.

In this work, a modulated photothermal radiometry principle is applied in a scanning configuration. This technique was developed with the aim of performing imaging and thermal characterization at the microscale and exploring characteristic times lower than those accessible by infrared thermography. The use of a heat source smaller than the measurement area provides high sensitivity to in-plane heat diffusion.