Preliminary study on LEMP three dimensional magnetic field measurement system

In order to receive the magnetic field component from the lightning channel current, this paper establishes twodimensional and threedimensional lightning electromagnetic pulse(LEMP) magnetic field measurement systems, which mainly consist of magnetic field signal measurement devices and transmission systems. The devices are composed of orthogonal square loop antennas with twolayered structure, outsideinside conductors and same area, the parameters of the antennas are determined by simulation. The signals transmit through optical fiber transmission system and shielding cable transmission system using two different signal processing circuits adopting optical isolation technology and nonphotoelectric conversional method. Experiment results prove that the systems performance well, and provide means for the lightning striking point determination and lightning current reconstruction.