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首页> 外文会议>Annual Symposium on Quantitative Nondestructive Evaluation; 19980719-24; Snowbird,UT(US) >A METHOD FOR THE EXPERIMENTAL CHARACTERIZATION OF PHASED ARRAY BEAM STEERING PROPERTIES
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A METHOD FOR THE EXPERIMENTAL CHARACTERIZATION OF PHASED ARRAY BEAM STEERING PROPERTIES

机译：相控阵梁转向性能的实验表征方法

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摘要

An experimental study used to assess the performance of linear phased arrays according to their beam steering behavior was presented in this paper. The key aspect of this behavior was described by the directivity, which shows amplitude as a function of radiation angle at a specific radius. Testing was done by mounting a phased array in a motorized fixture driven by a step motor. The transducer was programmed to steer at a specific angle and its radiation pattern was obtained using an immersion receiver focused beneath the rim of the disk. This approach was shown to provide uniform and consistent amplitude measurements which are critical to the directivity. The key result obtained from this study, which gave excellent testimony to the theoretical prediction, was that if the product Nd was kept constant, the directivity characteristics were preserved. That is, the main lobe sharpness was shown to be independent of the element packing configuration.
机译：本文提出了根据线性相控阵的光束转向性能评估其性能的实验研究。这种行为的关键方面是通过方向性来描述的，方向性将幅度表示为特定半径处的辐射角的函数。通过将相控阵安装在由步进电机驱动的电动夹具中进行测试。将换能器编程为以特定角度转向，并使用聚焦在磁盘边缘下方的浸入式接收器获得其辐射方向图。事实证明，这种方法可以提供均匀且一致的幅度测量，这对于方向性至关重要。从这项研究中获得的关键结果为理论预测提供了很好的证明，即如果产物Nd保持恒定，则方向性特性将得以保留。即，显示出主波瓣锐度与元件填充构造无关。

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