文献类型：期刊文献

英文题名：Distance Effect in Transient Thermography for Internal Defects Detection in Composites

作者：Tu, Yanxin[1];Mei, Hongwei[1];Liu, Lishuai[2];Sun, Rui[1];Guo, Chenjun[1,3];Shen, Zekai[1];Wang, Liming[1]

机构：[1]Tsinghua Univ, Shenzhen Int Grad Sch, Engn Lab Power Equipment Reliabil Complicated Coa, Shenzhen 518055, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[3]China Southern Power Grid Co, Kunming Power Supply Co, Kunming 650011, Yunnan, Peoples R China

年份：2022

卷号：71

外文期刊名：IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

收录：;EI(收录号：20224112869784);WOS:【SCI-EXPANDED(收录号:WOS:000870298900013)】；

基金：This work was supported by the National Natural Science Foundation of China under Grant 51977117.

语种：英文

外文关键词：Transient analysis; Temperature measurement; Cameras; Heating systems; Safety; Inspection; Feature extraction; Composites; detection effect; transient thermography; various distance

摘要：Composite materials are commonly used in industrial systems for their superior physical and chemical properties. Due to the necessity for safety distance in industrial systems, nondestructive testing (NDT) for composites at long distances provides an important guarantee for prompt detection of internal equipment failures. The existing long-distance inspection methods are mostly passive NDT techniques. In this article, a long-distance NDT method based on transient thermography is proposed. A theoretical model is established that integrates the transient thermography approach with the thermographic distance effect, providing the theoretical foundation for research based on distance detection effects. Different thermal wave features are extracted based on thermal physical parameters in the time and frequency domains, and the detection effect is compared based on different feature images. By conducting experiments on silicone rubber (SIR)-glass fiber-reinforced epoxy resin (GFE) bonded plate with artificially simulated internal defects, the effectiveness of both pulse thermography (PT) and step heating thermography (SHT) in long-distance inspection was compared, in which the SHT method was superior. The detection effect of feature images at different distances is compared using the SHT technique, the model's validity is tested, and the law of the function of distance in transient thermal imaging detection is derived. This work introduces the influence of distance in transient thermography for the first time, and it is hoped that this research can effectively guide and improve real industrial inspection.