Fei Chen , Kai Zhang , Haijun Jiang , Zhonghua Shen , Li Chen
{"title":"Modulated step-heating thermography for coating thickness measurement","authors":"Fei Chen , Kai Zhang , Haijun Jiang , Zhonghua Shen , Li Chen","doi":"10.1016/j.ndteint.2024.103140","DOIUrl":null,"url":null,"abstract":"<div><p>In this paper, the modulated step-heating thermography is proposed for opaque coating thickness measurement. The surface is heated by a modulated heating flux at a frequency that the thermal wave is confined within the coating layer. The DC component of the thermal signal is normalized by the amplitude of the AC component to cancel out the influences from the variations in heating intensity, surface absorptivity and emissivity, resulting in a linear correlation to the coating thickness. Meanwhile, it eliminates the need for tedious frequency trail and the issue of the nonmonotonicity as suffered in conventional thermography. Both theoretical and experimental results confirmed the effectiveness. Specimens with thickness ranging from 100 to 400 μm are measured with a relative error within ±7.9 %.</p></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"145 ","pages":"Article 103140"},"PeriodicalIF":4.1000,"publicationDate":"2024-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ndt & E International","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0963869524001051","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}
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Abstract
In this paper, the modulated step-heating thermography is proposed for opaque coating thickness measurement. The surface is heated by a modulated heating flux at a frequency that the thermal wave is confined within the coating layer. The DC component of the thermal signal is normalized by the amplitude of the AC component to cancel out the influences from the variations in heating intensity, surface absorptivity and emissivity, resulting in a linear correlation to the coating thickness. Meanwhile, it eliminates the need for tedious frequency trail and the issue of the nonmonotonicity as suffered in conventional thermography. Both theoretical and experimental results confirmed the effectiveness. Specimens with thickness ranging from 100 to 400 μm are measured with a relative error within ±7.9 %.
期刊介绍：
NDT&E international publishes peer-reviewed results of original research and development in all categories of the fields of nondestructive testing and evaluation including ultrasonics, electromagnetics, radiography, optical and thermal methods. In addition to traditional NDE topics, the emerging technology area of inspection of civil structures and materials is also emphasized. The journal publishes original papers on research and development of new inspection techniques and methods, as well as on novel and innovative applications of established methods. Papers on NDE sensors and their applications both for inspection and process control, as well as papers describing novel NDE systems for structural health monitoring and their performance in industrial settings are also considered. Other regular features include international news, new equipment and a calendar of forthcoming worldwide meetings. This journal is listed in Current Contents.
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