Broad-bandwidth radiation patterns of sparse two-dimensional vernier arrays
Broad-bandwidth radiation patterns of sparse two-dimensional vernier arrays
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DOI：
10.1109/58.655635
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发表时间：
1997-09-01
影响因子：
3.6
通讯作者：
Lockwood, GR
中科院分区：
文献类型：
--
作者：
Brunke, SS;Lockwood, GR
使用现有技术制造适合医学超声成像的密集（半波长单元间距）二维（2D）换能器阵列是不现实的。因此，人们对开发稀疏二维换能器阵列很感兴趣。在本文中，我们提出了一项研究的结果，该研究着眼于72种不同的稀疏二维游标阵列的宽带辐射模式。光栅瓣的抑制是通过选择不同的发射和接收元件的排列来实现的，使用类似的游标刻度。通过模拟点目标的体积扇形扫描，研究了宽带辐射方向图。我们通过推导一组设计曲线来总结这些结果，这些曲线预测了所需波束宽度和最大二次瓣所需的最小元件数量，元件间距和apodization。结果表明，与相同元数和孔径大小的稀疏随机阵列相比，稀疏游标阵列的平均和峰值二次叶瓣明显降低。
The fabrication of a dense (one-half wavelength element spacing) two-dimensional (2D) transducer array suitable for medical ultrasound imaging is unrealistic using existing technology. Consequently, there is interest in developing sparse 2D transducer arrays. In this paper, we present the results of a study looking at the broad-bandwidth radiation patterns of 72 different sparse 2D vernier arrays. Suppression of grating lobes is achieved by choosing a different arrangement of transmit and receive elements using an analogy with a vernier scale. The broad-bandwidth radiation patterns were investigated by simulating a volumetric sector scan of a point target. We summarize these results by deriving a set of design curves that predicts the minimum number of elements, element spacing, and apodization required for a desired beam width and maximum secondary lobe. The results show that a sparse vernier array can be designed with significantly lower average and peak secondary lobes compared with a sparse random array with the same number of elements and aperture size.