Experimental determination of laser heated surface temperature distributions

Shaapur, F.; Allen, S. D.
March 1987
Applied Physics Letters;3/23/1987, Vol. 50 Issue 12, p723
Academic Journal
A new scheme has been developed to measure laser-induced temperature distributions on solid surfaces, based on a first-order phase transition of an optically and thermally thin surface film where the transformed zone periphery marks the phase change isotherm of the film material. In order to test the technique, experimental measurements were made on a system for which analytical theoretical calculations and input parameters were available: steady-state 9.27-μm CO2 laser heating of semi-infinite SiC samples. The melting of polycrystalline films of NaCl (m.p. of 801 °C) and the eutectic mixture of NaCl-KCl (m.p. of 660 °C) spray deposited on the SiC surface served as the indicator. For a particular set of irradiation conditions, theoretical calculations were compared with experiment as a function of incident power.


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