Deep penetrating eddy currents and probes
Deep penetrating eddy currents and probes
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DOI：
10.3139/120.100810
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发表时间：
2007-01-01
期刊：
影响因子：
--
通讯作者：
Uchanin, Valentin
中科院分区：
文献类型：
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作者：
Mook, Gerhard;Hesse, Olaf;Uchanin, Valentin
涡流集肤效应限制了亚表面缺陷的检测和厚度测量的范围。基于平面波传播到导电半空间中来估计穿透深度的传统概念不能描述通过最先进的传感器和仪器可实现的真实的检测深度。本文提出了一个更富有成效的概念，估计噪声限制的检查深度。在这里，传统的参数，如频率，探头的尺寸，电导率和磁导率的分析结合在涡流技术的所有噪声和干扰源。本文介绍了一种新型的低频涡流探头，它具有感应式和磁阻式两种类型。这些联合收割机结合了较深的穿透力和相对较小的尺寸以及良好的空间分辨率。
The eddy current skin-effect limits the detection of subsurface defects and the range of thickness measurement. Traditional concepts to estimate the penetration depth basing on plane wave propagation into a conducting halfspace cannot describe the real depth of inspection achievable by state-of-the-art sensors and instruments. The paper presents a more fruitful concept for estimating the noise limited inspection depth. Here, the traditional parameters like frequency, probe dimensions, conductivity and permeability are analysed in combination with all sources of noise and disturbances in eddy current technique. New low frequency eddy current probes of inductive and magneto-resistive type are presented and characterised. These probes combine deep penetration with comparatively small size and good spatial resolution.