高频电磁涡流检测系统及实验研究

针对碳纤维复合材料电磁涡流检测的特点，自主设计研制了一套高频电磁涡流检测系统，其最高检测频率可以达到10 MHz以上。该系统下位机以高速ARM微控制器STM32F407VGT6芯片为控制核心，上位机以虚拟仪器软件LabVIEW设计用户界面。系统集成了信号发生模块、功率放大模块、可调增益放大模块、锁相放大模块、USB模块以及数据采集模块，集成度高、体积小、使用简单方便。利用制作的高频电磁涡流检测系统对碳纤维复合材料的常见损伤形式进行了检测，包括冲击以及分层等，证明了系统的可行性以及实用性。

High frequency electromagnetic eddy current testing system and experimental research

Based on the electrical characteristics of carbon fiber composite, such as low conductivity and anisotropy, a high frequency eddy current testing system with a maximum frequency as high as 10MHz is designed and developed in this study. The slave computer of this system is based on a high speed ARM microprocessor named STM32F407, and the host computer use virtual instrument software LabVIEW to design UI. The system is composed of a signal generator module, a power amplifier module, an adjusting gain amplifier module, a lock-in amplifier module, a USB transmission module and a data acquisition module. The system has the advantages of high integration and small size. We use the high frequency eddy current testing system to detect common damage of CFRP, including impact damage and delamination damage. The results prove the feasibility and practicability of the system.