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A parametric study of ultrasonic beam profiles for a linear phasedarray transducer

机译:线性相控阵换能器超声束轮廓的参数研究

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摘要

A numerical simulation model is presented to investigate theninfluences of design parameters of linear phased array transducers onnbeam focusing and steering performance. The characteristic of ultrasonicnbeam profiles has been simulated on the basis of the Huygen'snsuperposition principle. For the simulation, a linear phased array isnconsidered as the composition of finite number of elements separated bynequidistance. Individual elements are considered as two-dimensionalnpoint sources. The waves generated from piezoelectric elements arenconsidered as simplified transient ultrasonic waves that are constructednwith the cosine function enveloped with a Hanning window. Thencharacteristic of ultrasonic wave propagation into a medium from thenphased array transducer is described. The effects of the number, theninterelement spacing, steering angle, the focal length, and frequencynbandwidth of the piezoelectric elements on beam directivity andnultrasonic pressure field in a linear phased array transducer arensystematically discussed
机译:提出了一个数值仿真模型来研究线性相控阵换能器的设计参数对光束聚焦和转向性能的影响。根据惠更斯的叠加原理对超声束轮廓的特征进行了模拟。为了进行仿真,线性相控阵被视为由等距离分开的有限数量元素的组成。单个元素被视为二维点源。由压电元件产生的波被认为是简化的瞬态超声波,该瞬态超声波由用汉宁窗包裹的余弦函数构造而成。然后描述了超声波从相控阵换能器传播到介质中的特性。系统地讨论了线性相控阵换能器中压电元件的数量,元件间距,转向角,焦距和频率带宽对射束方向性和超声压力场的影响。

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