针对传统场指纹法(FSM)系统的直流激励电流的幅值较大的问题,提出了将锁相放大技术应用到FSM中以减小激励电流的方法.通过试验对比了传统FSM激励电流和采用锁相放大技术的激励电流的幅值.结果表明,在满足测量精度的前提下,锁相放大技术可以大幅度减小FSM的激流电流,系统能对管道内部腐蚀情况进行高效、可靠的在线监测.
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