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首页> 外文期刊>NDT & E international >Evaluating the conductivity distribution in isotropic polycrystalline graphite using spectroscopic eddy current technique for monitoring weight loss in advanced gas cooled reactors
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Evaluating the conductivity distribution in isotropic polycrystalline graphite using spectroscopic eddy current technique for monitoring weight loss in advanced gas cooled reactors

机译：使用光谱涡流技术评估各向同性多晶石墨中的电导率分布，以监测先进气冷反应堆中的重量损失

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摘要

Recently studies have shown correlation between the conductivity of graphite and its weight loss (density). This paper presents an eddy current technique for evaluating the conductivity profiles within 100 mm thick layered graphite sections. Flat graphite plates with three different grades of density for which the corresponding conductivities were measured, have been used to construct these sections. An initial test was performed to examine the capability of the eddy current technique to penetrate to a 100 mm depth in graphite. Then spectroscopic inductance measurements were acquired from different test profiles and compared with finite element method (FEM) simulated data. Conductivity profiles were reconstructed from the experimental data via the solution of an inverse eddy current problem. For an inverse solution, direct Tikhonov regularization and iterative Gauss Newton reconstruction schemes have been employed. Results show that the inverse methods are able to produce reasonable estimates of the conductivity profiles.
机译：最近的研究表明，石墨的电导率与其重量损失（密度）之间存在相关性。本文提出了一种涡流技术，用于评估100毫米厚的层状石墨截面内的电导率曲线。具有三种不同密度等级的平板石墨板已被用于测量这些部分，以测量相应的电导率。进行了初始测试，以检查涡流技术渗透到石墨中100毫米深度的能力。然后从不同的测试配置文件中获取光谱电感测量值，并将其与有限元方法（FEM）模拟数据进行比较。通过反涡流问题的解决方案，从实验数据中重构出电导率曲线。对于逆解，已采用直接Tikhonov正则化和迭代高斯牛顿重构方案。结果表明，逆方法能够对电导率曲线进行合理估计。

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