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Non-Multiplexed vs. Multiplexed Eddy Current Array Probes for Heat Exchanger Inspection

机译：用于热交换器检查的非多路复用与多路复用涡流阵列探头

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Eddy current testing (ECT) is a commonly used technique to inspect non-ferromagnetic heat exchanger and condenser tubing. The typical bobbin probe configuration has proven to be efficient at detecting volumetric flaws such as pitting, fretting, erosion and general corrosion. However, this probe design faces a major limitation with respect to cracking defects especially along the circumferential axis of the tube.Motorized rotating pancake coil (MRPC) probes have been developed to overcome the limitation of circumferential cracking and to provide a high resolution mapping of the tube, sensitive to all types of flaws in any orientation. However, this inspection technique remains very slow and not appropriate for inspecting the entire length of the tube. Eddy current array (ECA) tubing probes were introduced in the late 1990s with some success for the inspection of steam generators. However, these probes are very specialized, equipment and software-specific, and cost prohibitive outside the scope of SG applications.Interest has recently increased with regards to circumferential cracking and ECA probes. Manufacturers are responding by proposing various "arrays" which can be categorized as non-multiplexed or multiplexed array probes. Non-multiplexed probes are generally limited to a combination of bobbins and coils equal to the number of physical inputs of the ECT tester (usually 4 or 8). This category also includes air conditioning (AC) probes. Multiplexed probes leverage the physical inputs of an ECT instrument via timeslots and can physically accommodate up to 256 channels.This paper provides the laboratory and field results obtained with bobbin probes, non-multiplexed array probes, and multiplexed array probes. The performance of the various techniques is compared and other inspection requirements such as C-Scan imaging are described in detailed.
机译：涡流测试（ECT）是检查非铁磁热交换器和冷凝器管道的常用技术。事实证明，典型的线轴探针配置可有效检测体积缺陷，如点蚀，微动，腐蚀和全面腐蚀。然而，这种探头设计在裂纹缺陷方面尤其是在管子的圆周方向上面临着主要的局限性。已经开发了电动旋转煎饼线圈（MRPC）探头，以克服圆周裂纹的局限性并提供高分辨率的测绘结果。管，对任何方向的所有类型的缺陷都敏感。但是，这种检查技术仍然很慢，不适用于检查管子的整个长度。涡流阵列（ECA）管道探头于1990年代后期推出，并在检查蒸汽发生器方面取得了一些成功。但是，这些探针非常特殊，设备和软件特定，并且在SG应用范围之外的成本过高。最近，关于圆周裂纹和ECA探针的兴趣有所增加。制造商通过提出各种“阵列”来做出回应，这些“阵列”可以归类为非多路复用或多路复用阵列探针。非多路复用探头通常限于线轴和线圈的组合，其数量等于ECT测试仪的物理输入数量（通常为4或8）。此类别还包括空调（AC）探头。多路复用探头通过时隙利用ECT仪器的物理输入，可物理容纳多达256个通道。本文提供了使用线轴探头，非多路复用阵列探头和多路复用阵列探头获得的实验室和现场结果。比较了各种技术的性能，并详细介绍了其他检查要求，例如C扫描成像。

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