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Efficiency improvement of total focusing imaging based on sparse array method

机译:基于稀疏阵列方法的全聚焦成像效率提高

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摘要

In this paper, a design concept of sparse array is applied to total focusing imaging technique. During the process, the elements of a phased array are partially selected according to the theory of effective aperture, in order to reduce the amount of captured data and shorten the processing time of TFM imaging. Simulated imaging with Field II program and experimental verification on two standard phased array specimens are performed, based on three selected arrays which are sparsely as 1/2, 1/4 and 1/8. The results compared with the full array in terms of image quality and computing efficiency, show that the computing efficiency of TFM imaging can get a rise of 40 percent by adopting the sparse array design. Meanwhile, an approximate resolution can be achieved at the lowest array sparse rate of 1/4. Affected by the side-lobes of the ultrasonic beam, contrast of the image may suffer little loss.
机译:本文将稀疏阵列的设计思想应用于全聚焦成像技术。在此过程中,将根据有效光圈理论部分选择相控阵的元素,以减少捕获的数据量并缩短TFM成像的处理时间。基于三个选定的阵列(稀疏为1 / 2、1 / 4和1/8),使用Field II程序进行了模拟成像,并对两个标准相控阵样品进行了实验验证。结果与全阵列图像质量和计算效率相比,表明采用稀疏阵列设计可使TFM成像的计算效率提高40%。同时,可以在最低的阵列稀疏率1/4处获得近似的分辨率。受超声波束旁瓣的影响,图像的对比度可能损失很小。

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