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Bulk waves can be created in a thin piezoelectric plate by applying an electrical signal to interdigital electrodes deposited on each side of the plate. These transducers can be used to generate ultrasonic bulk waves with a wide range of frequencies and amplitudes controlled by a number ofelectrodes and a delayed voltage independently-applied to each electrode. The current work centers on feasibility study of damage detection via amplified ultrasonic signals generated by interdigital transducers. To this end, finite element simulation of the generation and detection of bulk waves in piezoelectric substrates by means of interdigital transducers is presented and their potential application as probes in smart structures is also discussed.