Calculation of Spatial Impulse Response for Array Transducer

概要

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Unlike the conventional method of obtaining the spatial impulse response (SIR) for a transducer from the time domain, we propose a new and computationally efficient approach for calculating the acoustic field for a rectangular focusing array transducer in a transmitting, receiving, or transmitting–receiving (pulse–echo) mode from the frequency domain. The SIR spectrum, corresponding to each single frequency, is derived by superposing the sound fields generated by the subdivided rectangular sources. The time-domain pressure variation is obtained by taking the inverse Fourier transform from the combination of each SIR spectrum for the array. The results for a single rectangular transducer in transmitting and receiving modes match well with those from previous studies. The SIR spectrum for a focusing linear array transducer with multiple field scatterers is also developed. The proposed approach markedly reduces the number of sampling points, thereby substantially increasing the computation efficiency.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2005-10-15