Influence of Core and Shield of Coil on Skin Depth in Eddy Current Testing

IF 1 4区材料科学 Q3 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Research in Nondestructive Evaluation Pub Date : 2022-01-02 DOI:10.1080/09349847.2022.2050861

Maosen Chen, Yanfei Liao, Z. Zeng, Junming Lin, Yonghong Dai

引用次数: 0

Abstract

ABSTRACT In eddy current (EC) nondestructive testing, coil is usually wound on core or covered by shield to improve the sensitivity of defect detection and ability of anti-interference of the probe. However, when core or shield is used, the magnetic field will be redistributed, resulting in a change in the speed of EC attenuation in the depth direction. The purpose of this paper is to reveal the influence of core and shield on skin depth of EC. The results of the finite element analysis show that applying core or shield on coil results in smaller skin depth and the skin depth decreases as the core or shield approaches the test sample. In addition, when both core and shield are used, the reduction of skin depth is minimal if both core and shield are ferromagnetic. The simulation results are verified by experiment.

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涡流检测中线圈的铁心和屏蔽对趋肤深度的影响

在涡流无损检测中，为了提高检测缺陷的灵敏度和探头的抗干扰能力，通常将线圈绕在铁芯上或用屏蔽罩覆盖。然而，当使用铁芯或屏蔽时，磁场将被重新分配，导致EC在深度方向上的衰减速度发生变化。本文的目的是揭示电磁芯和屏蔽层对电磁芯集肤深度的影响。有限元分析结果表明，在线圈上施加铁芯或屏蔽层可使趋肤深度减小，且趋肤深度随铁芯或屏蔽层靠近试样而减小。此外，当铁芯和屏蔽同时使用时，如果铁芯和屏蔽都是铁磁性的，则趋肤深度的减小最小。通过实验验证了仿真结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Research in Nondestructive Evaluation 工程技术-材料科学：表征与测试

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Research in Nondestructive Evaluation® is the archival research journal of the American Society for Nondestructive Testing, Inc. RNDE® contains the results of original research in all areas of nondestructive evaluation (NDE). The journal covers experimental and theoretical investigations dealing with the scientific and engineering bases of NDE, its measurement and methodology, and a wide range of applications to materials and structures that relate to the entire life cycle, from manufacture to use and retirement. Illustrative topics include advances in the underlying science of acoustic, thermal, electrical, magnetic, optical and ionizing radiation techniques and their applications to NDE problems. These problems include the nondestructive characterization of a wide variety of material properties and their degradation in service, nonintrusive sensors for monitoring manufacturing and materials processes, new techniques and combinations of techniques for detecting and characterizing hidden discontinuities and distributed damage in materials, standardization concepts and quantitative approaches for advanced NDE techniques, and long-term continuous monitoring of structures and assemblies. Of particular interest is research which elucidates how to evaluate the effects of imperfect material condition, as quantified by nondestructive measurement, on the functional performance.