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The study of the acoustic field generated by an ultrasonic transducer is fundamental to its construction and characterization, because it defines how it will behave before being built. It also defines whether it is feasible or not, for the application to which it was designed. It can also lead to modifications to the project so it behaves as expected. In this work, a software was implemented in MATLAB®, for computational simulation of acoustic fields generated by ultrasonic transducers of different configurations. Two models were used, Zemanek and Stepanishen. Transducers with focus and apodization and transmission medium with attenuation may also be simulated. For the simulation of Zemanek’s model, the mathematical method of discretization was used. The Stepanishen’s model used an analytical solution for the impulse response. The developed programs were aggregated into a computer package, named FSIM, and a graphic interface was created. The user can choose among some of the transducer configurations and simulation parameters already implemented. FSIM has a modular architecture and allows further simulation modules to be added. The simulations were validated comparing results to those previously published in classical papers from Zemanek, and from Lockwood and Willete, in addition to prior results from research studies conducted at the Biomedical Engineering Department of the School of Electrical and Computing Engineering at the Universidade Estadual de Campinas (UNICAMP). Resumen: El estudio del campo acustico generado por un transductor ultrasonico es fundamental para su construccion y caracterizacion, ya que define como se comportara antes de ser construido. Tambien define si realmente es factible para la aplicacion a la que fue disenado, y tambien puede sugerir modificaciones al proyecto, para que se comporte como se espera. En este trabajo un software fue implementado en MATLAB®, para la simulacion computacional de los campos acusticos generados por los transductores ultrasonicos de diferentes configuraciones. Dos modelos fueran usados, Zemanek y Stepanishen. Transductores con el enfoque y apodizacion y medios con atenuacion tambien pueden ser simulados. Para la simulacion del modelo de Zemanek, se utilizo el metodo matematico de discretizacion y para el modelo de Stepanishen, se empleo una solucion analitica para la respuesta impulsiva. Los programas desarrollados fueron agregados en un paquete computacional, llamado FSIM, y una interfaz grafica fue creada. El usuario puede elegir entre algunas configuraciones del transductor y parametros de simulacion ya implementados; FSIM tiene una arquitectura modular y permite que otros modulos de simulacion sean anadidos. Las simulaciones fueron validadas comparando resultados obtenidos previamente por otros trabajos de investigacion del Departamento de Ingenieria Biomedica de la Facultad de Ingenieria Electrica y Computacion de la UNICAMP y por los articulos clasicos de Zemanek y Lockwood y Willette.

revista de ingeniería biomédica

Development of a MATLAB Environment Software for Simulation of Ultrasonic Field (Desarrollo de un software en MATLAB para la simulación de campo ultrasónico)