1. 杭州意能电力技术有限公司
2. 国网浙江省电力有限公司电力科学研究院
3. 南昌航空大学无损检测教育部重点实验室
纸质出版:2023
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李延伟, 于志勇, 胡威, 等. 基于虚拟源的楔块斜入射全聚焦超声成像[J]. 传感器与微系统, 2023,(6):34-38.
李延伟, 于志勇, 胡威, 等. 基于虚拟源的楔块斜入射全聚焦超声成像[J]. 传感器与微系统, 2023,(6):34-38. DOI: 10.13873/J.1000-9787(2023)06-0034-05.
在楔块斜入射检测工况下,为获得更好的缺陷成像质量,提出一种全聚焦(TF)和虚拟源(VS)相结合的超声成像方法。首先,利用楔块和被检工件界面之间的回波飞行时间在界面上构建VS;然后,借助所建VS,计算双层介质下各阵元的延时时间;最后,对成像区域中的各点进行延时叠加处理,得到斜入射检测工况下的TF图像。结果表明:构建VS引起的信号相位偏差不超过π/2,因而VS-TF图像能够准确呈现出楔块倾角和缺陷的位置。
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