文献类型：期刊文献

英文题名：Health Monitoring of RTV Silicone Rubber Coating on Insulators Based on Multimode Features of Active Infrared Thermography

作者：Liu, Lishuai[1];Guo, Chenjun[2,3];Xiang, Yanxun[1];Tu, Yanxin[3];Mei, Hongwei[3];Wang, Liming[3];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Yunnan Power Grid Co Ltd, Elect Power Res Inst, Kunming 650217, Yunnan, Peoples R China;[3]Tsinghua Univ, Shenzhen Int Grad Sch, Shenzhen 518055, 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：20221411920212);WOS:【SCI-EXPANDED(收录号:WOS:000782798200003)】；

基金：This work was supported in part by the National Natural Science Foundation of China under Grant 12104155, Grant 12025403, and Grant U1930202; in part by the Shanghai Sailing Program under Grant 21YF1408900; and in part by the Natural Science Foundation of Shanghai under Grant 21ZR1417100.

语种：英文

外文关键词：Coatings; Photothermal effects; Surface treatment; Thickness measurement; Inspection; Frequency-domain analysis; Transient analysis; Active infrared thermography (AIT); electrical insulator; frequency aliasing; multimode features; room-temperature vulcanized (RTV) coating; thickness measurement

摘要：Poor quality of room-temperature vulcanized silicone rubber (RTV-SIR) coating on insulators, such as damages, inclusions, debonding, uneven or substandard thickness, and so on, seriously deteriorates the external insulation performance and brings potential threats to the safety of power grids. This article proposed a convenient, quantitative, and nondestructive inspection method for room-temperature vulcanized (RTV) coating using multimode features of active infrared thermography (AIT). First, the thermal wave model of RTV coating was established to explain the theoretical basis for defect detection and thickness measurement of RTV coating based on the surface transient temperature field. Typical defects of RTV coating were detected, and the defect identification was enhanced by the statistical reconstructed thermal images. The frequency-domain features and the reciprocal square root of the minimum phase frequency (RSRMPF), which was proved to have a linear relationship with the coating thickness, were extracted from the phase spectrum of transient thermal response to quantitatively characterize the micrometer thickness of RTV coating. Particularly, the frequency aliasing phenomenon in small thickness measurement when the sampling frequency is not high enough was reported. And the genetic algorithm was adopted to implement the transient thermal response fitting to overcome the distortion of the phase spectrum induced by the frequency aliasing to obtain the accurate fitted linear calibration line. It has been demonstrated that AIT would have promising application prospects in industrial-quality inspection of RTV coating.