Speaker
Tanawut Rittidach
Description
In this research, a nondestructive, simple and rapid method, photothermal deflection technique or the so-called “mirage effect”, is setup. A flat and smooth sample is heated by a modulated 532nm 14mW pump beam on the surface. The heat flow induced by the surface layer is detected by the deflected 632nm 0.14mW probe beam. The frequency-dependent signal in the range of 1 - 800 Hz is measured by lock-in amplifier in term of amplitude and phase. The clay roof tile with and without the waterproof glaze layer on top is measured. Thermal diffusivity of the clay roof tile and the waterproof glaze layer is determined by the theoretical model.
