Investigation of Skewness Feature for Evaluation of Defects Using Eddy Current Pulsed Thermography
Investigation of Skewness Feature for Evaluation of Defects Using Eddy Current Pulsed Thermography
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DOI：
10.1109/jsen.2019.2936221
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发表时间：
2019-12-15
影响因子：
4.3
通讯作者：
Wu, Jianbo
中科院分区：
文献类型：
--
作者：
Chen, Xiaotian;Tian, Guiyun;Wu, Jianbo
复杂缺陷的定量无损评估（QNDE）仍然是挑战。 3D 涡流脉冲热成像 (ECPT) 的瞬态热响应包含有关缺陷特征的丰富信息。本文提出了一种从瞬态热响应中提取的修正偏度特征，用于 3D ECPT 中的 QNDE。对角裂纹的瞬态响应的不同阶段及其偏度特征进行了实验研究。将倾斜度特征映射到 3D 测距仪捕获的 3D 点云，以显示 3D 倾斜度特征分布。由于不同瞬态阶段偏度特征的不同行为，在计算整个瞬态热响应之前对加热阶段进行修改和反转。结果表明，修正偏度消除了加热阶段和冷却阶段温度分布的抵消作用，使得修正偏度特征对于缺陷深度的评估具有更高的灵敏度和线性度。
The quantitative non-destructive evaluation (QNDE) of complex defects remains as challenges. The transient thermal responses of 3D eddy current pulsed thermography (ECPT) contains rich information for the defect characteristics. In this paper, a modified skewness feature extracted from the transient thermal responses is proposed for the QNDE in 3D ECPT. Different stages of the transient responses and their skewness features are experimentally investigated for angular cracks. The skewness feature is mapped to 3D point cloud captured by a 3D ranger in order to show the 3D skewness feature distribution. The heating stage is modified and inverted before the calculation of the entire transient thermal response due to different behaviors of skewness features at different transient stages. Results show that the modified skewness removed the counteracting effect of the temperature distribution in the heating stage and cooling stage, which make the modified skewness feature has higher sensitivity and linearity for the evaluation of defect depths.