相控阵超声二维稀疏阵列的优化设计应用研究

在相控阵超声检测中,稀疏阵列是利用较少阵元数目获得大阵列孔径的有效办法。目前一些稀疏阵列没计的方法,并没充分利用有效阵元。本文首先采用遗传算法没计二维稀疏阵列,发现遗传算法设计的稀疏阵列,一致性较差。主要原因是在没有任何限制的条件下,寻优搜索空间大,遗传算法参数往往难于控制。针对此问题,受十字形稀疏阵列和最小冗余度阵列的启发,本文将最小冗余度阵列拓展到二维稀疏阵列的设计中。计算机模拟和实验都表明,利用最小冗余度阵列和遗传算法设计的二维稀疏阵列具有很好的空间分辨率和对比度分辨率。

A novel method to design 2D sparse array for ultrasonic phased array

Sparse array is an effective way to enlarge aperture and enhance spatial resolution. The popular methods of designing sparse array can not supply the best array configuration. In this article, 2D sparse arrays are designed firstly by Genetic algorithm. But sparse array designed only by Genetic algorithm have bad consistency probably because the searching space is too huge and parameters of Genetic algorithm can not be perfectly controlled. Borrow the idea from mill-cross sparse array and the MRLA- Minimum-Redundancy Linear Array, a new method is put forward to design the 2D sparse array. Both simulation and experiment confirm the effectiveness of this combined method.