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We present a method for measurement of the thermal diffusivity of metallic samples in the form of thin filaments, which is inspired in both the photothermal beam deflection and the shadowgraph techniques. The method utilizes the shadow projected by the sample when put against a collimated light source (a probe beam). The sample is then heated periodically by another light beam (the pump beam), giving rise to thermal waves, which propagate across it and through its surroundings. Changes in the refraction index of the surrounding media due to the heating distort the shadow. The periodical time evolution of the shadow is recorded by a FLIR SC2500 Infrared Camera and lock-in amplified in order to determine the sample ́s thermal diffusivity by the well-known phase slope method.

Photothermal pump-probe lock-in shadowgraph technique using a thermographic camera for thermal diffusivity measurement in thin metallic filaments