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对于探测地下金属管道、电缆等导体，电磁法比其它电测方法更为有效和方便。使用无参考线虚分量仪（DDW-1）并采用正交线圈装置观测磁场虚分量的方法，特别适合在城市（甚至在市区）探测金属导体。这是因为这种系统只有一台窄带接收机，激发时又不接地，并观测结果与收发距关系不大。一般说在电磁场中金属管道和电缆引起的感应电流可以近似为线电流，因而资料解释简单。本文展示了北京城区和郊区的某些实际成果。
For the detection of underground metal pipes, cables and other conductors, the electromagnetic method is more effective and convenient than other electrical measurement methods. The method of using the DDW-1 without reference line and observing the imaginary component of the magnetic field using an orthogonal coil device is particularly suitable for detecting metal conductors in the city (even in urban areas). This is because this system has only a narrow-band receiver, when excited, is not grounded, and the observation results have little to do with the transceiver. In general, induced currents caused by metal pipes and cables in an electromagnetic field can be approximated as line currents, so data interpretation is simple. This article shows some of the actual results in Beijing’s urban and suburban areas.