涡流探头的屏蔽对扫频测量灵敏度的影响

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-11-29 DOI:10.3233/jae-230138

Arjun A.R., B. Sasi, Anish Kumar

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引用次数: 0

摘要

在样品边界附近进行测量时，涡流测量容易受到边缘效应的影响。为了减少这些边缘效应，通常会使用铁氧体屏蔽，将磁场限制在屏蔽体积内。然而，它们对扫频涡流 (SFEC) 测量中电导率变化的灵敏度的影响尚未得到研究。我们开发了一个二维轴对称有限元模型 (FEM)，用于预测 SFEC 探头阻抗的频率响应。该模型预测，增加屏蔽后，边缘效应最小，但灵敏度降低。为优化探头设计以提高屏蔽铁氧体探头的灵敏度，进行了模拟研究。基于这些结果，我们构建了一个带有定制铁氧体屏蔽的探头，并通过实验将其屏蔽效率和探头灵敏度与带有传统铁氧体屏蔽的探头进行了比较。

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Effect of shielding of eddy current probes on the sensitivity for sweep frequency measurements

Eddy current measurements are prone to edge effects when measurements are carried out near a sample boundary. In order to reduce these edge effects, typically ferrite shields are used which constrain the magnetic field within the shield volume. However, their effects on sensitivity towards changesin conductivity for Sweep Frequency Eddy Current (SFEC) measurements have not been investigated. A 2D axisymmetric Finite Element Model (FEM) has been developed to predict the frequency response of impedance of SFEC probes. The model predicted that the addition of shields minimized edge effect but with reduced sensitivity. A simulation study is carried out to optimize the probe design to increase the sensitivity of shielded ferrite probes. Based on these results, a probe is constructed with a custom ferrite shield and its shielding efficiency and probe sensitivity are compared experimentally with those for the probe with conventional ferrite shields.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.