远场涡流传感器与信号调理电路优化设计及其应用

Investigation of Optimized Design for Remote Field Eddy Current Sensor and Signal Conditioning Circuit

传感器设计是远场涡流检测系统的核心与关键。结合仿真与实验研究远场涡流传感器与信号调理电路的优化设计方法:采用电磁屏蔽、磁路,以缩短探头长度、增强检测信号;采用组合滤波与正交锁相放大电路,以增强微小缺陷的检测能力;采用同态滤波以及误差修正等数字信号处理技术,以提高检测结果可靠性。实验结果表明,上述方法对于提高系统性能行之有效。

The sensor design plays an important role on the remote field eddy current system. According with the simulation and experiment, some methods used to optimize the sensor and signal conditioning of remote field eddy current are investigated as follows： using shield and magnetic circuit to shorten the length of sensor and enhance the signal; adopting orthogonal lock - in - amplifier so as to inten- sify the capability for fine defect detection; using digital signal processing technology insure the detecting rehability. Experiment results show that it＇s effective to enhance the system performance via using above mentioned methods.