23 May 2003 Diffraction-free ultrasonic transducers for image processing
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In many ultrasonic applications, such as ultrasonic imaging and signal processing, it is important that the transmitted pulse shape and ultrasonic beam profile remain consistent throughout the entire radiated field. The principles of diffraction strongly influence the ultrasonic beam profile and pulse shape and causes a considerable fluctuation in the near field region and a significant beam spreading in the far field region. In this work, different voltage distribution such as, logarithmic,linear and Gaussian across the transducer surface was investigated. The effect of a new electrode configuration based on a resistive taper on transducer performance was also discussed. Several transducers have been built to illustrate this design approach with good agreement between theory and experiment.
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Behrooz Kanani, Behrooz Kanani, } "Diffraction-free ultrasonic transducers for image processing", Proc. SPIE 5035, Medical Imaging 2003: Ultrasonic Imaging and Signal Processing, (23 May 2003); doi: 10.1117/12.479882; https://doi.org/10.1117/12.479882

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