Due to the structure characteristic of traditional pulsed eddy current ( PEC) sensor, there is self-excitation disturbance in practical detection which causes low sensitivity. A rectangular sensor is proposed to improve the detectability. On the basis of analysis of detecting principle of this sensor, detecting model of rectangular PEC sensor is set up using ANSYS software. The distribution of eddy current and the disturbance of 3D magnitic field caused by crack is analyzed by simulation. The result shows that the rectangular sensor can induce uniform eddy current on the aluminium plate, and a crack' s size can be quantified dectected by analyzing the 3 signals.%传统的脉冲涡流传感器由于其结构特点,在实际检测中存在自身激励干扰,使得其对缺陷的检测灵敏度不高.为了提高传感器对缺陷的检测能力,采用矩形传感器对铝板上缺陷进行检测.在分析矩形脉冲涡流传感器检测原理的基础上,采用ANSYS仿真软件建立了矩形脉冲涡流传感器检测模型,对矩形激励下方铝板表面涡流分布进行了仿真计算,研究了缺陷对空间三维磁场的扰动规律.仿真结果表明:矩形传感器能够在铝板表面激励出均匀的感应涡流；当有缺陷存在时,提取三维响应信号的幅值为特征量,分析传感器在扫描路径上不同位置检测幅值的变化特征发现,通过3个信号幅值变化的位置和幅值变化的程度可以实现对缺陷长度,宽度和深度进行定量检测.
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