科研之友
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摘要
X-waves are one type of limited diffracting waves which have many potential applications in the enlargement of the field depth in acoustic imaging systems. However, the generation of X-waves ultrasonic fields in real-time need a complex and expensive technology which involves precise and specific voltage time distributions for the excitation of each distinct array element. In order to overcome the high cost and technology, we proposed the new approach by approximating the excitation driving pulse from rectangular to triangular driving pulse and chose the pulses with the minimal optimization result as approximation driving pulses due to L2 curve criterion. The calculation of X-wave acoustic fields is based on the spatial impulse response approach, a new, simplified and exact solution algorithm to calculate of spatial pulse response is described in the paper, it is determined by intersection line of transducer apertures and the projected of spherical waves, which can reduce the calculation time. From these results of calculation of X-wave acoustic fields, the accuracy of the X-wave simulation can be improved by the new approach. A tradeoff is obtained between the cost of implementation of classical 0-order X-waves and the precision of approximation with the simple pulsed electrical driving.
- 出版日期2013
- 单位华中科技大学
