圆柱铁氧体微裂纹的激光扫描热成像检测

王晓娜; 姚行洲; 侯德鑫; 叶树亮

doi:doi:10.3788/irla201847.1106005

红外与激光工程, 2018, 47 (11): 1106005, 网络出版: 2019-01-10

圆柱铁氧体微裂纹的激光扫描热成像检测

Detection of microcrack in cylinder ferrite components based on scanning laser thermography

论文大纲

王晓娜 ^*姚行洲侯德鑫叶树亮

作者单位

中国计量大学工业与商贸计量技术研究所, 浙江杭州 310018

激光热成像相邻点热信号欧氏距离裂纹检测圆柱铁氧体 laser thermography adjacent thermal signal Euclidean distance crack detection cylinder ferrite

摘要

针对用激光局部加热试样引起的横向热流检测裂纹, 对低热导率材料表面的微小裂纹成像信噪比较低的问题, 提出基于相邻热信号比较的圆柱铁氧体表面微裂纹检测算法。基于几何模型重构运动的圆周表面各点热信号, 以激光扫描方向相邻点热信号的欧氏距离作为特征进行成像。仿真分析确定热信号裁剪区间、参考信号位置等算法参数。对6个具有5~35 μm宽度自然裂纹的样品进行实验, 结果表明, 在线激光2.66 mm/s的扫描速度下, 裂纹成像信噪比相比常规方法提高1~2倍, 可清晰成像出裂纹的形状。

Abstract

Aiming at laser heating the specimen locally to detect cracks, and the signal-to-noise ratios fell when surface cracks in material with low thermal conductivity were imaged, a detection algorithm of surface microcrack which compared the adjacent thermal signals in cylinder ferrite components was proposed. The thermal signal at each position on moving cylinder was reconstructed based on geometric model, then the Euclidean distance along the laser scanning direction was used as a feature to image. The relative algorithm parameters about cutting area of thermal signal and the position of reference signal were confirmed by simulation analysis. The specimen were test, which had 5-35 μm wide crack on 6 cylinder ferrite surface. The results show that this approach can enhance the signal-to-noise ratio by 1 to 2 times compared with conventional approach at the line-laser scanning speed of 2.66 mm/s, and it can image the shape of cracks evidently.

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王晓娜, 姚行洲, 侯德鑫, 叶树亮. 圆柱铁氧体微裂纹的激光扫描热成像检测[J]. 红外与激光工程, 2018, 47(11): 1106005. Wang Xiaona, Yao Xingzhou, Hou Dexin, Ye Shuliang. Detection of microcrack in cylinder ferrite components based on scanning laser thermography[J]. Infrared and Laser Engineering, 2018, 47(11): 1106005.

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