Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate
Abstract In eddy current testing, the law of attenuation of eddy current (EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the d...
Main Authors: | , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
SpringerOpen
2019-12-01
|
Series: | Chinese Journal of Mechanical Engineering |
Subjects: | |
Online Access: | https://doi.org/10.1186/s10033-019-0419-6 |
id |
doaj-35e6f92d6bb74ec6b9779c275ec6ab91 |
---|---|
record_format |
Article |
spelling |
doaj-35e6f92d6bb74ec6b9779c275ec6ab912020-12-13T12:13:01ZengSpringerOpenChinese Journal of Mechanical Engineering1000-93452192-82582019-12-013211910.1186/s10033-019-0419-6Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic PlateZhiwei Zeng0Pengcheng Ding1Jiayi Li2Shaoni Jiao3Junming Lin4Yonghong Dai5School of Aerospace Engineering, Xiamen UniversitySchool of Aerospace Engineering, Xiamen UniversitySchool of Aerospace Engineering, Xiamen UniversitySchool of Aerospace Engineering, Xiamen UniversityWork Station of Academicians, Fujian Province (Eddysun)Work Station of Academicians, Fujian Province (Eddysun)Abstract In eddy current testing, the law of attenuation of eddy current (EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the distribution of EC in the depth direction is more complicated. This paper studies the characteristics of EC attenuation in metallic plate of finite thickness. Simulation results show that there is an EC reflection at the bottom of plate, which changes the law of EC attenuation. A new concept, namely the equivalent attenuation coefficient, is proposed to quantify the speed of EC attenuation. The characteristics of EC attenuation are utilized to explain the nonmonotonic relation between coil voltage and plate thickness. Procedure of selecting frequency is discussed. Thereafter, measurement of plate thickness is carried out and accurate result is obtained.https://doi.org/10.1186/s10033-019-0419-6Eddy current testingAttenuation of eddy currentThickness measurementMetallic plate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Zhiwei Zeng Pengcheng Ding Jiayi Li Shaoni Jiao Junming Lin Yonghong Dai |
spellingShingle |
Zhiwei Zeng Pengcheng Ding Jiayi Li Shaoni Jiao Junming Lin Yonghong Dai Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate Chinese Journal of Mechanical Engineering Eddy current testing Attenuation of eddy current Thickness measurement Metallic plate |
author_facet |
Zhiwei Zeng Pengcheng Ding Jiayi Li Shaoni Jiao Junming Lin Yonghong Dai |
author_sort |
Zhiwei Zeng |
title |
Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate |
title_short |
Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate |
title_full |
Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate |
title_fullStr |
Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate |
title_full_unstemmed |
Characteristics of Eddy Current Attenuation and Thickness Measurement of Metallic Plate |
title_sort |
characteristics of eddy current attenuation and thickness measurement of metallic plate |
publisher |
SpringerOpen |
series |
Chinese Journal of Mechanical Engineering |
issn |
1000-9345 2192-8258 |
publishDate |
2019-12-01 |
description |
Abstract In eddy current testing, the law of attenuation of eddy current (EC) is of great concern. In conductive half space under the excitation of uniform magnetic field, the EC density decreases exponentially in the depth direction. However, in conductor with finite thickness tested by coil, the distribution of EC in the depth direction is more complicated. This paper studies the characteristics of EC attenuation in metallic plate of finite thickness. Simulation results show that there is an EC reflection at the bottom of plate, which changes the law of EC attenuation. A new concept, namely the equivalent attenuation coefficient, is proposed to quantify the speed of EC attenuation. The characteristics of EC attenuation are utilized to explain the nonmonotonic relation between coil voltage and plate thickness. Procedure of selecting frequency is discussed. Thereafter, measurement of plate thickness is carried out and accurate result is obtained. |
topic |
Eddy current testing Attenuation of eddy current Thickness measurement Metallic plate |
url |
https://doi.org/10.1186/s10033-019-0419-6 |
work_keys_str_mv |
AT zhiweizeng characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate AT pengchengding characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate AT jiayili characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate AT shaonijiao characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate AT junminglin characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate AT yonghongdai characteristicsofeddycurrentattenuationandthicknessmeasurementofmetallicplate |
_version_ |
1724385144482037760 |