| 基于磁场梯度测量的脉冲涡流检测关键技术研究 |
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| 引用本文： | 齐勇,刘相彪,李勇,陈振茂,李炜昕. 基于磁场梯度测量的脉冲涡流检测关键技术研究[J]. 中国机械工程, 2014, 25(8): 1108 |
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| 作者姓名： | 齐勇 刘相彪 李勇 陈振茂 李炜昕 |
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| 作者单位： | 西安交通大学机械结构强度与振动国家重点实验室,西安,710049 |
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| 基金项目： | 国家自然科学基金资助项目(51007069/E070104) |
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| 摘 要： | 提出一种新型脉冲涡流检测技术,将广泛应用于医学核磁共振成像、超导量子干涉仪的磁场梯度测量技术引入到脉冲涡流检测技术中,以提高脉冲涡流检测金属构件表面缺陷灵敏度。通过仿真和试验,着重分析了脉冲涡流检测表面裂纹的扫描结果。研究发现,磁场梯度信号较磁场差分信号具有更高的检测灵敏度,验证了所提出技术的有效性。
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| 关 键 词： | 电磁无损检测 脉冲涡流检测 磁场梯度测量技术 表面裂纹 |
Pulsed Eddy Current Testing Based on Gradient Magnetic Field Measurement |
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| Qi Yong,Liu Xiangbiao,Li Yong,Chen Zhenmao,Li Weixin. Pulsed Eddy Current Testing Based on Gradient Magnetic Field Measurement[J]. China Mechanical Engineering, 2014, 25(8): 1108 |
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| Authors: | Qi Yong Liu Xiangbiao Li Yong Chen Zhenmao Li Weixin |
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| Affiliation: | State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi'an Jiaotong University,Xi'an,710049 |
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| Abstract: | This paper proposed a new PECT technique by introducing GMFM which was intensively used in magnetic resonance imaging(MRI) and superconducting quantum interference devices(SQUID) to PECT in an effort to enhance the PECT sensitivity to surface cracks. The scanning results regarding PECT evaluation of surface cracks were intensively analyzed via simulations and experiments. It is found that the GMFM signals have higher sensitivity than that of the conventional PECT differential signals in evaluation of surface cracks, which verifies the validity of the proposed method. |
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| Keywords: | electromagnetic nondestructive testing and evaluation pulsed eddy current testing(PECT) gradient magnetic field measurement(GMFM) surface crack |
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