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首页> 外文会议>International conference on electrical, control computer engineering >Effect of Excitation Frequency on Magnetic Response Induced by Front-and Back-Side Slits Measured by a Differential AMR Sensor Probe
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Effect of Excitation Frequency on Magnetic Response Induced by Front-and Back-Side Slits Measured by a Differential AMR Sensor Probe

机译：激励频率对差分AMR传感器测得的前，后狭缝引起的磁响应的影响

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Defects in steel structures are one of the major problems that may affect the functionality of the structure. Thus, the detection of the defects is fairly crucial to prevent any unwanted accident from occurring. Nondestructive Testing (NDT) is a group of methods that is widely used to detect those defects, especially cracks. This paper will be focusing on the detection of cracks (artificial slits) by using the Magnetic Flux Leakage (MFL) technique in the magnetic method of NDT. A non-saturated differential MFL probe consists of two AMR sensors has been fabricated for the detection of front as well as backside slits. A measurement system which incorporates the developed probe attached on an XY-stage, a set/reset circuit, an amplifier circuit, a DAQ card, and PC is constructed where an XY-stage controller and a digital lock-in amplifier are developed with the implementation of Lab VIEW. Then, the developed MFL probe's performance is evaluated by running several line scan measurements on a 2-mm galvanized steel plate sample engraved with artificial slits with depths that varies from 1.0 to 1.6 mm with variable excitation frequencies. The results show promising output where the slits could be successfully detected and its position could be further estimated. Furthermore, the correlation between the slit depth and difference (delta value) between the signal peaks and troughs could also be founded. Consequently, the optimum excitation frequency can be determined by plotting a graph of the slope of trend line of the delta values versus the frequency.
机译：钢结构中的缺陷是可能影响结构功能的主要问题之一。因此，检测缺陷对于防止任何意外事故的发生至关重要。无损检测（NDT）是广泛用于检测那些缺陷（尤其是裂纹）的一组方法。本文将重点研究在NDT的磁性方法中使用磁通量泄漏（MFL）技术检测裂缝（人工缝隙）的方法。一种非饱和差分MFL探头，由两个AMR传感器组成，用于检测前后狭缝。构建了一个测量系统，该系统结合了已开发的，安装在XY平台上的探头，置位/复位电路，放大器电路，DAQ卡和PC，其中开发了XY平台控制器和数字锁定放大器，并且Lab VIEW的实施。然后，通过对刻有2毫米镀锌钢板样品的数条线扫描测量结果进行评估，以评估其开发的MFL探针的厚度，这些缝隙的深度在1.0到1.6 mm之间变化，并且激发频率可变。结果表明，有希望的输出可以成功检测到狭缝，并且可以进一步估计其位置。此外，还可以建立狭缝深度与信号峰值和谷值之间的差异（增量值）之间的相关性。因此，可以通过绘制增量值趋势线的斜率与频率的关系曲线图来确定最佳激励频率。

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