电磁钢轨探伤仪器开发与现场测试

Development of electromagnetic rail inspection instrument and its field testing

多频电磁激励电磁钢轨探伤仪器应用电磁感应原理可探测钢轨浅表层缺陷及裂缝,仪器系统包括电磁探伤传感器、电磁激励解调信号处理单元、仪器机械承载结构、通信模块和仪器监控计算机。仪器以FPGA为信号处理核心,实现了电磁激励信号的产生与放大、检测信号的调理与解调,并提取钢轨损伤信息通过以太网传输到监控计算机。监控计算机实现钢轨损伤信息的显示、存储和仪器设置。经现场测试,该仪器能够实时探测到钢轨浅表损伤,具有较好的现场应用前景。

A multi-frequency electromagnetic rail inspection instrument is developed. The instrument can detect the near surface defect and crack of rail. The instrument consists of electromagnetic detection sensor, electromagnetic excitation and demodulation ele- ment, instrument loading mechanical structure, communication module and human machine interface computer. Designed with Field Programmable Gate Array （FPGA） as main processor, the instrument realizes the functions including excitation signal generating, de- tection signal conditioning and demodulation. The rail inspection result information can be extracted and transferred to the interface computer. The interface computer is used to display and store the rail defect information, and set the options of the instrument. Field testing shows that the instrument can detect the near surface defect of sample rail. Therefore it has prospect of field application.