A perturbation method for modelling the thermal sensitivity of surface transverse wave (STW) propagation on a piezoelectric substrate

A perturbation method has been developed in order to correctly predict the sensitivity of surface transverse waves (STW) to quasi-static temperature effects. This approach is based on the coupling of unperturbed STW characteristics and thermoelastic properties of the substrate. The unperturbed STW parameters are calculated taking piezoelectricity into account for propagation under shallow grooves and thin metal strips. An analytical expression of the first order temperature coefficient is obtained in the case of grooves. Finite element analysis has been used for the case of metal strips deposited on crystalline substrate submitted to slow temperature variations. The validity of the results presented is carefully analysed and comparisons with available experimental data are discussed.<
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