Feasibility study on surface temperature depth profiling by surface acoustic wave spectroscopy

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In this work, feasibility study on surface temperature depth profiling by surface acoustic wave (SAW) spectroscopy has been made theoretically and experimentally. At first it has been demonstrated theoretically that it seems difficult for many of industrial materials to have a steep temperature gradient in which the material surface is being heated. Based on the prior information, numerical simulations rather than experiments are performed to examine the feasibility of surface temperature depth profiling by SAW. The results show that although surface temperature gradient might be able to be determined from SAW dispersion, it must be very difficult to realize such quantitative determination with experimental data measured using a conventional ultrasonic instrumentation. This is basically because of measurement uncertainty in ultrasonic signals of the present apparatus. It is fortunately demonstrated that ultrasonic pulse-echo technique with an effective inversion method provides an appropriate surface temperature depth profiling if the temperature gradient near material surface is gradual.