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김동식(Dongsik Kim),최선락(Sun Rock Choi),이주철(Joochul Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper introduces a novel scheme for determining the thermal diffusivity of solids<br/> using the photothermal mirage technique. The suggested scheme extends the thermal-wave<br/> coupling method, employing the solution to the heat conduction equation in close proximity<br/> to the pump beam. Therefore, determination of thermal diffusivity is possible by detecting<br/> the mirage signal with small separation between the probe and pump beams, with enhanced<br/> intensity of the mirage signal. Though the method requires information about the probebeam<br/> height, the absolute transverse position of the probe beam need not be known as it is<br/> automatically evaluated by the iterative-computation procedure. The thermal diffusivity of<br/> Ni is measured by the proposed scheme and the result demonstrates good agreement with<br/> the literature value to within 5 %.