针对传统涡流检测仪器硬件复杂、成本较高的缺点, 采用虚拟仪器技术, 研制了一套基于LabVIEW的涡流无损检测系统。系统由涡流检测硬件电路、上位计算机、数据采集卡以及相关软件组成。重点介绍了硬件电路中的激励源、自动平衡电路和相敏检波模块的设计。系统完成后, 对圆管管壁通孔和钢条裂纹进行了检测试验。检测结果表明系统具备良好的检测性能。

Directing against the disadvantage of the complicated hardware and high cost of traditional eddy current testing instrument, a LabVIEW based eddy current testing system was developed. The system was composed of hardware circuit, computer, data acquisition card and relative software. The design of the carrier frequency generator, auto-balance circuit and the phase-sensitive detector was introduced in detail. Testing experiments were done using the system, and the results showed that the system had good testing capability.