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用于检测小直径棒材表面缺陷的脉冲涡流传感器的设计与研究

Design and Study of Pulsed Eddy Current Sensor for Detecting Surface Defects in Small-Diameter Bars.

作者信息

Han Lei, Jiang Yi, Yuan Ming

机构信息

School of Electrical Engineering, Nanjing Vocational University of Industry Technology, Nanjing 210023, China.

College of Automation & College of Artificial Intelligence, Nanjing University of Posts and Telecommunications, Nanjing 210023, China.

出版信息

Sensors (Basel). 2024 Dec 18;24(24):8063. doi: 10.3390/s24248063.

DOI:10.3390/s24248063
PMID:39771797
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11679082/
Abstract

The design and study of pulsed eddy current sensors for detecting surface defects in small-diameter rods are highly significant. Accurate detection and identification of surface defects in small-diameter rods may be attained by the ongoing optimization of sensor design and enhancement of detection technologies. This article presents the construction of a non-coaxial differential eddy current sensor (Tx-Rx sensor) and examines the detection of surface defects in a small diameter bar. A COMSOL 3D model is developed to examine the variations in eddy current distribution and defect signal characteristics between the plate and rod components. The position of the excitation coil on the bar and the eddy current disruption around the defect are examined. Additionally, a Tx-Rx sensor has been developed and enhanced concerning coil dimensions, coil separation, and elevation height. An experimental system is established to detect bar structures with surface defects of varying depths, and a model correlating differential signal attenuation with defect depth is proposed, achieving a quantitative relative error of less than 5%, thereby offering a reference for the quantitative detection of bar surface defects.

摘要

用于检测小直径棒材表面缺陷的脉冲涡流传感器的设计与研究具有重要意义。通过不断优化传感器设计和提升检测技术，可以实现对小直径棒材表面缺陷的准确检测与识别。本文介绍了一种非同轴差分涡流传感器（Tx-Rx传感器）的结构，并研究了小直径棒材表面缺陷的检测。开发了一个COMSOL三维模型，以研究平板和棒材部件之间涡流分布和缺陷信号特征的变化。研究了棒材上激励线圈的位置以及缺陷周围的涡流扰动。此外，还对Tx-Rx传感器在线圈尺寸、线圈间距和提升高度方面进行了改进。建立了一个实验系统来检测具有不同深度表面缺陷的棒材结构，并提出了一个将差分信号衰减与缺陷深度相关联的模型，实现了小于5%的定量相对误差，从而为棒材表面缺陷的定量检测提供了参考。

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