{"title":"Measurement of finite plate size in pulsed eddy current testing","authors":"Rui Guo, Kuohai Yu, Saibo She, Xinnan Zheng, Wuliang Yin","doi":"10.1016/j.measurement.2025.117202","DOIUrl":null,"url":null,"abstract":"<div><div>Pulsed eddy current methods have been used to measure thickness and physical properties of metallic materials. These methods are applicable to plates of infinite size or plates much larger than the sensor size (3–5 times). However, existing methods (single-frequency or multi-frequency eddy current method) for solving circular plates of finite size are limited to the frequency domain and cannot satisfy relative thick samples or samples with high magnetic permeability. In this research, a pulsed eddy current (PEC) analytical method for finite radius plates is proposed by extending the finite size Dodd–Deeds model and the truncated region eigenfunction expansion (TREE) to the time domain. Based on the modified analytical solution, a radius measurement method for finite size circular carbon steel plates is introduced. The radius measurement method is experimentally verified and the results show that the average error is less than 1%.</div></div>","PeriodicalId":18349,"journal":{"name":"Measurement","volume":"251 ","pages":"Article 117202"},"PeriodicalIF":5.2000,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Measurement","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0263224125005615","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Pulsed eddy current methods have been used to measure thickness and physical properties of metallic materials. These methods are applicable to plates of infinite size or plates much larger than the sensor size (3–5 times). However, existing methods (single-frequency or multi-frequency eddy current method) for solving circular plates of finite size are limited to the frequency domain and cannot satisfy relative thick samples or samples with high magnetic permeability. In this research, a pulsed eddy current (PEC) analytical method for finite radius plates is proposed by extending the finite size Dodd–Deeds model and the truncated region eigenfunction expansion (TREE) to the time domain. Based on the modified analytical solution, a radius measurement method for finite size circular carbon steel plates is introduced. The radius measurement method is experimentally verified and the results show that the average error is less than 1%.
期刊介绍:
Contributions are invited on novel achievements in all fields of measurement and instrumentation science and technology. Authors are encouraged to submit novel material, whose ultimate goal is an advancement in the state of the art of: measurement and metrology fundamentals, sensors, measurement instruments, measurement and estimation techniques, measurement data processing and fusion algorithms, evaluation procedures and methodologies for plants and industrial processes, performance analysis of systems, processes and algorithms, mathematical models for measurement-oriented purposes, distributed measurement systems in a connected world.