Reducing the Effect of Surface Emissivity Variation in Eddy Current Pulsed Thermography
Reducing the Effect of Surface Emissivity Variation in Eddy Current Pulsed Thermography
复制标题
减少涡流脉冲热成像中表面发射率变化的影响
DOI：
10.1109/jsen.2013.2294195
复制
发表时间：
2014-04-01
影响因子：
4.3
通讯作者：
Chen, Kai
中科院分区：
文献类型：
--
作者：
Bai, Libing;Tian, Shulin;Chen, Kai
在涡流脉冲热像仪中，人工选择的帧被用于缺陷检测和量化。缺陷由框架内的高/低温度指示。然而，表面发射率的变化有时会引入虚幻的温度不均匀，从而导致检测虚警。为了提高检测概率，提出了一种基于两个热平衡态的检测方法。对于每个像素，从两个热平衡状态中提取表面发射率系数，并使用该系数来校正瞬时响应。因此，温度和发射率是分开的。对既有抛光带漆又有黑色带漆的钢样进行了验证实验，图像质量得到了显著改善。
Manually selected frames have been used for both defect detection and quantification in Eddy current pulsed thermography. Defects are indicated by high/low temperatures within frames. However, variation of surface emissivity sometimes introduces illusory temperature inhomogeneity and results in detection false alarms. To improve the probability of detection, this paper proposes a two heat balance states-based method. For each pixel, a surface emissivity coefficient is extracted from the two heat balance states and is used to correct the transient response. The temperature and emissivity is thus separated. A verified experiment was carried out on a steel sample having both a polished and black strip painted surface, and the image quality was improved significantly.