2008
EMSS 2008 Proceeding
Evaluation of ga estimation parameters in wideband piezoelectric transducers employing a comprehensive modeling tool
Authors: Abelardo Ruíz Toledo,David K. Anthony, Antonio Ramos Fernández
Abstract
Broadband piezoelectric transducers are used in many ultrasonic transceiver systems for Non Destructive Evaluation (NDE) and medical imaging. Precise knowledge of their internal construction parameters is required in modelling and simulation tasks to optimise behaviour in such systems. Genetic algorithms (GA) have been proposed to estimate parameters in piezoelectric backed transducers. They can help to improve the precision of the input data in the modeling and simulation tasks when this information is not available. Here, a circuital modeling approach to evaluate practical effectiveness of GA transducer estimation results, is presented and applied to achieve improvements during design and modeling tasks (with the aim of optimizing ultrasonic transceiver responses). HV spike driving and pulse-echo waveforms are simulated in time-frequency domains for selected sets of estimated parameters. Their dependences on the estimating parameters were considered, and the responses of alternative transducer designs were quantified.
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