陕西师范大学学报（自然科学版）2026，Vol.54Issue(2)：32-40,9.DOI:10.15983/j.cnki.jsnu.2026206
基于Otsu阈值的超声全聚焦裂纹成像表征方法
Ultrasonic total focusing method for crack imaging and characterization based on Otsu thresholding
摘要
Abstract
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%.关键词
超声检测/定量检测/全聚焦方法/Otsu阈值Key words
ultrasonic testing/quantitative testing/total focusing method(TFM)/Otsu threshol-ding分类
矿业与冶金引用本文复制引用
李潇,迟冰玉,罗忠兵,金士杰..基于Otsu阈值的超声全聚焦裂纹成像表征方法[J].陕西师范大学学报（自然科学版）,2026,54(2):32-40,9.基金项目
国家自然科学基金(52275520,52375527) （52275520,52375527）
