输油管道漏磁检测信号自适应滤波的研究

在采用漏磁法对输油管道进行无损检测过程中,信号会受到各种噪声的干扰。介绍了输油管道漏磁检测方法及归一化最小均方自适应滤波方法。通过实验装置采集了含有噪声的漏磁信号。由于各传感器提离值不能保证一致,对信号进行了补偿调整。将一路的传感器输出信号作为主输入信号,与之相邻的传感器输出信号作为参考信号,采用归一化自适应滤波对主输入信号进行处理。结果表明,采用归一化最小均方自适应滤波方法可使缺陷漏磁信号的信噪比得到显著的提高。

Research of adaptive filter processing in magnetic flux leakage signal obtained from oil pipeline

There are varying noises in output signal obtained from magnetic flux leakage(MFL) nondestructive testing of oil pipeline.MFL nondestructive testing of oil pipeline and normalized least mean squared adaptive filter methods were presented.The MFL signal was acquired from the data collection device.MFL signal was compensated for different sensor lift-off.The reference input and the primary input to the adaptive system are the output signals obtained from two MFL sensors in proximity.The primary input signal was processed using normalized least mean squared adaptive filter.The results show that the signal noise ratio of MFL signal was improved significantly.