基于平面线圈阵列传感器的铝板材料裂纹电涡流检测

设计并研制了一种采用平面PCB板工艺制作的线圈阵列式电涡流传感器,包括采用计算公式确定了平面圆形螺旋线圈的相关参数;采用ANSOFT有限元软件进行仿真,分析了试件裂纹缺陷处涡流场的分布状态;以非铁磁性材料铝板作为被测试件,对其上的预制裂纹进行检测,证明了这种平面线圈阵列传感器工作的有效性. 结果表明,这种平面线圈阵列式电涡流传感器能够有效检测铝板上的微小裂纹,且信号幅值等输出信号参数和裂纹的几何参数之间具有较好的相关性. 

Study on Aluminum Specimen Eddy Current Crack Detection with Planar Coil Array Sensor

In this paper, a coil array eddy current sensor was developed using planar printed circuit board (PCB) plate, and the parameters of planar circular spiral coil were determined with a calculation formula. The distribution state of vortex field on the specimen crack was simulated and analyzed with a finite element software ANSOFT. A non ferromagnetic material aluminum plate was taken as the test pieces to carry out the crack detection and prove the validity of planar coil array sensor. The results show that the planar coil array eddy current sensor can detect tiny cracks on the aluminum plate, and with a good correlation between amplitude of output signals and geometric parameters of cracks.