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We present a simple electromechanical finite difference model to study theresponse of a piezoelectric polyvinylidenflourid (PVDF) transducer tooptoacoustic (OA) pressure waves in the acoustic nearfield prior to thermalrelaxation of the OA source volume. The assumption of nearfield conditions,i.e. the absence of acoustic diffraction, allows to treat the problem using aone-dimensional numerical approach. Therein, the computational domain ismodeled as an inhomogeneous elastic medium, characterized by its local wavevelocities and densities, allowing to explore the effect of stepwise impedancechanges on the stress wave propagation. The transducer is modeled as a thinpiezoelectric sensing layer and the electromechanical coupling is accomplishedby means of the respective linear constituting equations. Considering alow-pass characteristic of the full experimental setup, we obtain the resultingtransducer signal. Complementing transducer signals measured in a controlledlaboratory experiment with numerical simulations that result from a model ofthe experimental setup, we find that, bearing in mind the apparent limitationsof the one-dimensional approach, the simulated transducer signals can be usedvery well to predict and interpret the experimental findings.

Numerical prediction of the piezoelectric transducer response in the  acoustic nearfield using a one-dimensional electromechanical finite  difference approach