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首页> 外文期刊>Journal of Nondestructive Evaluation >New Discoveries on Electromagnetic Action and Signal Presentation in Magnetic Flux Leakage Testing
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New Discoveries on Electromagnetic Action and Signal Presentation in Magnetic Flux Leakage Testing

机译：磁通量泄漏检测中电磁动作和信号呈现的新发现

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Based on the authors' previous work of magnetic flux leakage (MFL) quantitative description and the research plan especially for the magnetic component of eddy current effect factor further explorations for electromagnetic actions, magnetic and signal presentations in the defect in electromagnetic nondestructive testing (ENDT, such as direct current field measurement (DCFM), MFL and eddy current testing (ECT)) are continued here. Primarily, new discoveries indicate that the magnetic component of is actually composed of the secondary magnetic field component of Delta Bmfwhich manifests as raised signal waves and volume current perturbation component of Delta B Delta I which features as double peaked signals due to the departure or bypassing of the "volume current" in the defect. What's more, the concrete expressions of magnetic components are deduced and given through Ampere's (or the Ampere-Maxwell) law. Afterwards, the theory is well demonstrated and verified by means of finite element analysis for current density and magnetic flux density or MFL signals in typical quasi-static testing by DC magnetization for different specimens with defects. Additionally, suggestions for installation site of sensor elements in ENDT are also given. Finally, a unified evaluation standard for magnetic flux density is formed, which provides the basic theory or analysis principles for the ENDT techniques as well as research directions for precision defect detection and related applications.
机译：基于作者的磁通量泄漏（MFL）定量描述和研究计划，特别是对于涡流效应因子的磁性分量进一步探索电磁作用，磁性和信号呈现在电磁无损检测中的缺陷（Endt，如在此继续进行直流场测量（DCFM），MFL和涡流测试（ECT））。主要是，新发现表明，实际上由Delta BMFFFF的次磁场分量的磁性分量作为ΔBΔi的升高信号波和体积电流扰动组成，其特征是由于离开或绕过的双峰值信号。缺陷中的“音量电流”。更重要的是，通过安培（或安培 - 麦克斯韦尔韦尔）法推断和给予磁性部件的混凝土表达。之后，通过针对电流密度和磁通密度或MFL信号的有限元分析，通过DC磁化为不同标本的不同标本的典型准静态测试中的电流密度和磁通密度或MFL信号进行了很好的说明和验证。此外，还给出了ENDT中的传感器元件安装现场的建议。最后，形成了磁通密度的统一评估标准，这为ENDT技术提供了基本理论或分析原理以及精密缺陷检测和相关应用的研究方向。

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