Abstract: Reflected signals in the electromagnetic ultrasonic detection of oil-gas pipeline were treated using a novel time-domain method.A new algorithm is presented.The mathematic simulation exemplified that this algorithm has better anti-jamming property.The output signal can be converged normally when the designed frequency departs the input signal frequency by 20%.The tested result of electromagnetic signal detection shows the validity of this method to eliminate noise of electromagnetic ultrasonic signal and improve measurement precision of electromagnetic detector used for detecting pipeline.

Key words: oil-gas pipeline, in-line detection, electromagnetic ultrasonic technique, noise elimination signal processing

摘要： 为从油气管道电磁超声检测的反射信号中提取出有用信息采用了新的时域分析技术进行电磁超声反射信号的处理。对该算法进行了数学推导,数学仿真试验证明,该算法具有高的抗干扰性。当设置的初始频率偏离输入信号频率20%时,输出信号仍可以正常收敛。实际信号处理表明,该方法可以明显地降低电磁超声回波信号的噪声,有助于提高电磁超声管道检测器的测量精度。

关键词: 油气管道, 在线检测, 电磁超声法, 噪音消除, 信号处理