基于涡流检测的压电元件裂纹自动检测系统

Automatic Crack Detection System for Piezoelectric Elements based on Eddy Current Detection

针对水声换能器弯曲振子的压电元件裂纹的区分难题,技术研究人员采用涡流检测技术来区分压电元件裂纹缺陷,设计了一套自动化的压电元件裂纹涡流检测系统。该系统利用涡流检测、定位分拣、电气、中控等装置实现压电元件裂纹的自动检测、筛选、标记等,使用该系统对压电元件裂纹缺陷进行检测验证试验研究。试验研究表明,该系统在软件增益调至38 dB、涡流探头外壁距离压电元件表面1 mm时可有效识别出压电元件出现的贯穿裂纹、边缘裂纹、中间裂纹等常见裂纹缺陷。该检测设备和工艺可广泛用于其他工艺领域换能器压电元件的裂纹检测。

In order to solve the problem of distinguishing the cracks of piezoelectric elements in the bending oscillator of underwater acoustic transducer,the researchers used eddy current detection technology to distinguish the cracks of piezoelectric elements,and designed a set of automatic eddy current detection system for cracks of piezoelectric elements.The system used eddy current detection,location sorting,electrical,central control and other devices to realize the automatic detection,screening and marking of cracks in piezoelectric elements,and used the system to test and verify the cracks of piezoelectric elements.Experimental results showed that when the software gain was adjusted to 38 dB and the outer wall of eddy current probe was 1 mm away from the piezoelectric element surface,the system could effectively identify the common cracks such as through-wall crack,edge crack and middle crack.The testing equipment and process could be widely used in other fields of transducer piezoelectric cracks detection.