H. Tian, S. Yamada, M. Iwahara, H. Watanabe, H. Tooyama
{"title":"Eddy-current scratch inspection with high probe lift-off","authors":"H. Tian, S. Yamada, M. Iwahara, H. Watanabe, H. Tooyama","doi":"10.1109/INTMAG.2005.1463641","DOIUrl":null,"url":null,"abstract":"High lift-off inspection in eddy current testing (ECT) has wide and important applications. However the reliable ECT detection for shallow scratches is generally carried out only on the surface or with a low lift-off height from probe because of the large lift-off noise of sensor and decreasing signal level in the high lift-off condition. In this paper, the proposed ECT probe is consisted of vertical rectangle exciting coil and spin-valve type giant magnetoresistive (SV-GMR) sensor to detect the surface scratches of 0.3 mm depth in a stainless steel plate with a 5 mm lift-off height. This structure of probe can suppress lift-off noise and pick up magnetic field signals up to several /spl mu/T. In addition, 3-D finite element method (FEM) is applied to simulate the length information as well as scratches information using a single GMR sensor probe scanning. Experimental results prove that the proposed ECT probe has good detection capabilities in the condition of high lift-off height.","PeriodicalId":273174,"journal":{"name":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","volume":"17 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2005-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"INTERMAG Asia 2005. Digests of the IEEE International Magnetics Conference, 2005.","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/INTMAG.2005.1463641","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 2
Abstract
High lift-off inspection in eddy current testing (ECT) has wide and important applications. However the reliable ECT detection for shallow scratches is generally carried out only on the surface or with a low lift-off height from probe because of the large lift-off noise of sensor and decreasing signal level in the high lift-off condition. In this paper, the proposed ECT probe is consisted of vertical rectangle exciting coil and spin-valve type giant magnetoresistive (SV-GMR) sensor to detect the surface scratches of 0.3 mm depth in a stainless steel plate with a 5 mm lift-off height. This structure of probe can suppress lift-off noise and pick up magnetic field signals up to several /spl mu/T. In addition, 3-D finite element method (FEM) is applied to simulate the length information as well as scratches information using a single GMR sensor probe scanning. Experimental results prove that the proposed ECT probe has good detection capabilities in the condition of high lift-off height.
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