The phase of a temperature field resulting from the harmonic surface heating of a film can contain sufficient information to determine the film thermal properties. The case of a film having anisotropic properties and heated by a Gaussian laser beam is analytically analyzed. The transient part of the solution is expressed in terms of a complex temperature field to relay both amplitude and phase information. A general solution for the temperature distribution throughout the film and substrate is presented and analyzed to assess strategies for resolving multiple thermal properties of the film based on the underlying heat transfer. A sensitivity analysis is performed and two limiting cases of the solution are analyzed to resolve the in-plane conductivity, across-plane conductivity, and heat capacity of the film using surface temperature phase measurements.

Issue Section:
Conduction
Keywords:
heating, laser beam effects, thin films, heat transfer, temperature distribution, thermal conductivity, specific heat, Analytical, Heat Transfer, Periodic, Properties, Thin Films
Topics:
Anisotropy, Heat transfer, Heating, Laser beams, Temperature, Thermal conductivity, Thermal properties, Film thickness, Lasers, Thin films
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