摘要
为解决动态孔径发射检测效率低而动态深度聚焦成像技术不同深度检测分辨率不均匀的问题,结合两种技术的优点,设计了一种多重深度聚焦发射方案。通过对超声相控阵成像空间分辨力与线性阵列结构参数关系的分析,确定了分区对称发射方式。并在标定横向焦宽7 mm,纵向焦深50 mm条件下,得到探测深度最大为110mm。经仿真成像对比,证明了该发射方法可有效改善分辨率不均和动态范围随探测深度降低的问题,且有效提高了超声相控阵检测效率。
In order to solve the problems of low detection efficiency of the dynamic aperture emission and non-uniform resolution of the dynamic depth of focusing（DDF）in different depths,a multi-depth focusing phased array emitting scheme is designed by combining the advantages of the two technologies in this paper.After analyzing the relationship between the spatial resolution of the ultrasonic phased array imaging and the parameters of linear array structure,an emission method of symmetrically partial emitting is confirmed eventually.After demarcating focalwidth as 7mm and focal-depth as 50 mm,the detecting range higher limit is confirmed as 110 mm.By contrasting with the imaging simulations of different emission methods,the proposed emission method is proved to be effective in improving the resolution non-uniformity and detecting dynamic range attenuation.
出处
《压电与声光》
CAS
CSCD
北大核心
2016年第2期349-352,共4页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(61127008)
关键词
超声相控阵检测
空间分辨力
多重深度聚焦
线性阵列
ultrasonic phased array inspection
spatial resolution
multi-depth focusing phased array
linear array
