Generation and detection of unipolar stress pulses

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Abstract
We have used pulse shaping of the applied voltages, varying the acoustic and the electrical impedances of our transmitters and receivers, and special transducer designs in our efforts to generate and detect unipolar stress pulses. Heavily damped broadband commercial transducers have been used, as well as a specially made thick air‐backed PZT (lead zirconium titanate) plate and two different reflection mode transmitter‐receiver configurations. A simple theory for transmitting and receiving transducers is presented which explains well a variety of different observations.