Abstract
A model computation was conducted in two dimensions to determine the spatial resolution of thermal wave methods for periodic structures. The model is appropriate for line heating systems used for improving speed limits of thermal wave methods. The results may be considered as approximate for problems requiring three-dimensional treatment. Numerical computations of the response of a thermal wave imaging system for periodic variations of material parameters along the surface show resonancelike behavior around the thermal diffusion length. The resolution of the system determined according to the Rayleigh criterion is about two thirds of the thermal diffusion length. Below that value the amplitude of the temperature signal decreases with increasing periodic variation wave vector with a slope of about 9.5 dB/octave. A formula is given for the determination of resolution for structures other than periodic.
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