基于Otsu阈值的超声全聚焦裂纹成像表征方法OA
Ultrasonic total focusing method for crack imaging and characterization based on Otsu thresholding
针对传统全聚焦方法(total focusing method,TFM)在识别裂纹端面时易受衍射波干扰的问题,提出了一种基于Otsu阈值的成像表征新方法.该方法以全矩阵捕捉(full matrix capture,FMC)数据为基础,构建全矩阵幅值图谱,并通过Otsu自适应阈值算法实现对反射与衍射区域的自动分割;在成像过程中仅对反射矩阵信号进行延时叠加,有效避免了衍射能量对端面反射的掩盖,提升了成像效率.基于铝合金内部裂纹的仿真与实验结果显示,该方法在裂纹尺寸测量和成像效率方面均优于基于全矩阵的传统TFM方法,裂纹长度测量误差小于 0.3mm,角度测量误差小于 2.0°,成像所需时间减少 60%以上.
The identification of crack tips in total focusing method(TFM)is easily affected by diffraction waves.In this study,the ultrasonic TFM based on Otsu thresholding is proposed for crack characterization.The full-matrix amplitude map is first constructed from the full matrix capture(FMC)data.Then,the adaptive algorithm of Otsu threshold is applied to automatically segment the reflection and diffraction regions.Only the reflection signals are used for delay-and-sum process and imaging to avoid diffraction interference and improve efficiency.Detection results of internal cracks in aluminum alloy show that the proposed method outperforms the conventional TFM using complete FMC data in crack measurement and imaging efficiency.The error of crack length is less than 0.3 mm,the error of angular is within 2.0°,and the required imaging time is reduced by more than 60%.
李潇;迟冰玉;罗忠兵;金士杰
大连理工大学 材料科学与工程学院,辽宁 大连 116024大连理工大学 材料科学与工程学院,辽宁 大连 116024大连理工大学 材料科学与工程学院,辽宁 大连 116024大连理工大学 材料科学与工程学院,辽宁 大连 116024
矿业与冶金
超声检测定量检测全聚焦方法Otsu阈值
ultrasonic testingquantitative testingtotal focusing method(TFM)Otsu threshol-ding
《陕西师范大学学报（自然科学版）》 2026 (2)
32-40,9
国家自然科学基金(52275520,52375527)
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