中文摘要：

由于电涡流缺陷检测多采用单方向激励方式，而实际检测中缺陷的方向是未知的，从而造成检测灵敏度不确定。针对此情况设计以巨磁电阻（GMR）传感器为检测元件的矩形线圈激励的检测探头，以矩形缺陷为研究对象，从定性和定量两个角度仿真对比了在同一激励方向下，不同方向缺陷引起的磁感应强度变化，发现缺陷方向平行于激励线圈轴线时能更好地体现缺陷，在此基础上，对不同方向缺陷进行扫描实验，将测量数据扫描曲线进行对比发现，当缺陷方向平行于激励线圈轴线时曲线峰值较大且峰值位置明显，能更清晰地反映缺陷信息。

英文摘要：

Due to the single direction incentive mode is mostly used in eddy current defect detection and defects direction in real detection is unknown, resulting in detection sensitivity is uncertain. Aiming at this case, adetecting probe with rectangular coil exciting based on GMR is designed, and rectangular defects are selected as research target. Through the qualitative quantitative simulation and comparison variation of magnetic induction intensity under the same incentive direction and defects in different directions, the defect direction parallel to axis of exciting coil can reflect defect better. On this basis, scanning experiment is carried out in different directions, scanning curves of test data are compared,it suggests that the defects parallel to the axis of the exciting coil has higher peak value and more significant peak position ,which is more applicable to reflect defect information.