Top ceramic coating thickness measurement of thermal barrier coating based on chirped-pulse eddy current testing

IF 4.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Ndt & E International Pub Date : 2025-09-18 DOI:10.1016/j.ndteint.2025.103554

Gaochi Zhou , Mengbao Fan , Fengshan Sun , Jingyuan Li , Binghua Cao , Bo Ye

{"title":"Top ceramic coating thickness measurement of thermal barrier coating based on chirped-pulse eddy current testing","authors":"Gaochi Zhou , Mengbao Fan , Fengshan Sun , Jingyuan Li , Binghua Cao , Bo Ye","doi":"10.1016/j.ndteint.2025.103554","DOIUrl":null,"url":null,"abstract":"<div><div>The thickness of thermal barrier coatings (TBCs) directly impacts the lifespan and high-temperature resistance of turbine blades in engines. However, due to the low conductivity of TBCs, conventional pulsed eddy current testing (PECT) faces challenges in accurately measuring the thickness of top ceramic coating (TC), primarily attributed to the generation of weak detection signals that are highly susceptible to electromagnetic interference and quantization errors. To address this issue, this paper firstly employed chirped-pulse signal as the excitation signal and applied pulse compression to the detection signal. The peak value with the maximum SNR was then used as a feature, and the parameters of chirped-pulse signal were optimized based on the linear relationship between the peak value and the thickness of TC. Finally, the proposed method was validated using a constructed detection system. The result indicates that the relative error of the proposed method is within 3.5 %, with the root mean square error reduced by 60 % compared to PECT. This suggests that the developed method presents significant potential for practical TBCs thickness measurement applications.</div></div>","PeriodicalId":18868,"journal":{"name":"Ndt & E International","volume":"158 ","pages":"Article 103554"},"PeriodicalIF":4.5000,"publicationDate":"2025-09-18","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/S096386952500235X","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}

引用次数: 0

Abstract

The thickness of thermal barrier coatings (TBCs) directly impacts the lifespan and high-temperature resistance of turbine blades in engines. However, due to the low conductivity of TBCs, conventional pulsed eddy current testing (PECT) faces challenges in accurately measuring the thickness of top ceramic coating (TC), primarily attributed to the generation of weak detection signals that are highly susceptible to electromagnetic interference and quantization errors. To address this issue, this paper firstly employed chirped-pulse signal as the excitation signal and applied pulse compression to the detection signal. The peak value with the maximum SNR was then used as a feature, and the parameters of chirped-pulse signal were optimized based on the linear relationship between the peak value and the thickness of TC. Finally, the proposed method was validated using a constructed detection system. The result indicates that the relative error of the proposed method is within 3.5 %, with the root mean square error reduced by 60 % compared to PECT. This suggests that the developed method presents significant potential for practical TBCs thickness measurement applications.

查看原文本刊更多论文

基于啁啾脉冲涡流检测的热障涂层顶部陶瓷涂层厚度测量

热障涂层的厚度直接影响发动机涡轮叶片的使用寿命和耐高温性能。然而，由于tbc的低电导率，传统的脉冲涡流测试（PECT）在准确测量顶部陶瓷涂层（TC）厚度方面面临挑战，主要原因是产生的检测信号较弱，极易受到电磁干扰和量化误差的影响。为了解决这一问题，本文首先采用啁啾脉冲信号作为激励信号，并对检测信号进行脉冲压缩。然后以信噪比最大的峰值为特征，根据峰值与TC厚度的线性关系对啁啾脉冲信号参数进行优化。最后，通过构建的检测系统对所提方法进行了验证。结果表明，该方法的相对误差在3.5%以内，均方根误差比PECT降低了60%。这表明所开发的方法在实际tbc厚度测量应用中具有重要的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Ndt & E International 工程技术-材料科学：表征与测试

CiteScore

7.20

自引率

9.50%

发文量

121

审稿时长

55 days

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.