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基于哈尔巴赫阵列的高温电磁超声波环导导波传感器的研究

Yuanxin Li1,2, Jinjie Zhou1,2, Jiabo Wen1,2

  • 1School of Mechanical Engineering, North University of China, Taiyuan 030051, China.

Micromachines
|April 26, 2025
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概括

这项研究引入了一种新型的高温电磁声学传感器 (EMAT),使用哈尔巴赫阵列来检查高达600°C的管道. 它实现了10分钟的稳定运行,克服了关键基础设施监控现有的EMATs的局限性.

关键词:
在CLamb中,波浪是CLamb波浪.在EMATAT中,我们可以使用EMAT.哈尔巴赫阵列是一组.发现缺陷检测检测缺陷检测高温管道管道高温管道管道起飞机起飞机起飞机起飞

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科学领域:

  • 材料科学 材料科学 材料科学
  • 非破坏性测试 不破坏性测试
  • 机械工程 机械工程

背景情况:

  • 石油化工和电力行业的高温管道面临极端条件 (450-600°C),有可能出现应力腐蚀和爬行等缺陷.
  • 传统的检查方法需要昂贵的关机,而现有的电磁声传感器 (EMAT) 具有有限的高温耐受性 (≤500°C) 和短期稳定性 (<5分钟).

研究的目的:

  • 开发一种高频环向导波 (CLamb波) EMAT,能够在600°C管道上长期稳定检测.
  • 克服当前EMAT技术的温度耐受性和稳定性限制,以有效地进行现场监测.

主要方法:

  • 设计了一个CLamb波EMAT,使用哈尔巴赫永久磁铁阵列来优化磁流密度.
  • 实现磁电路优化和多层绝缘,以提高高温性能和稳定性.
  • 进行模拟以评估磁流密度和大升起时的位移幅度.
  • 在600°C进行实验验证,以评估传感器温度,缺陷检测能力和信号稳定性.

主要成果:

  • 哈尔巴赫阵列EMAT在9毫米升起时显示磁流密度增加1.4倍,位移幅度增加2倍.
  • 传感器在600°C的外部温度下保持了稳定的内部温度低于167°C.
  • 成功检测到小于3毫米半孔的缺陷,低信号衰减率为0.32%/分钟.
  • 观察到高温 (<5分钟) 的Q235管道的信号幅度比室温高1.5倍,尽管长期稳定性受到材料降解的影响.

结论:

  • 开发的哈尔巴赫阵列EMAT克服了高温应用的长期检测瓶.
  • 这项技术提供了一种新的,高效的在线检查高温管道的方案,提高了安全性并降低了成本.
  • 可能需要进一步的研究来解决材料降解效应,以在极端环境中实现更长期的稳定性.