Some methods for overcoming these disadvantages are investigated as follows : first, using shield and magnetic circuit to shorten the sensor length and enhance the signal magnitude; second, improving the data acquisition system to intensify the capability of fine defect detection; at last, adopting digital signal processing technology such as homomorphic filter, wavelet transform and error correction to ensure detecting reliability 本文结合有限元仿真和实验方法,研究了改进远场涡流技术性能的几种方法,即:采用电磁屏蔽、磁路进行传感器优化设计以缩短探头长度、增大信号强度;改进信号调理电路以提高细微缺陷检出能力;利用同态滤波、小波变换以及误差修正等数字信号处理技术确保检测结果的可靠性。