The dipolemethod, which utilizes high-voltage direct current, is a simple, low-cost, and highly workable method to fully detect the liner without destruction.
About theoretic calculation for lightning electromagnetic field, two analytical methods are raised, which are dipolemethod in time domain and time-varying field method in frequency domain.
在雷电电磁场的理论计算方面，提出了两种方法，即时域中的偶极子方法和频域中的时变场方法。
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A two stage complex image method is proposed to rapidly and precisely calculate the refractive field of an overhead dipole (generalized sommerfeld integral, GSI) in the earth.