Experimental study on the magnetic field shielding property of CFRP

The shielding effectiveness (SE) of carbon fiber reinforced polymer (CFRP) composite is investigated by a set of pulsed field generator considering the low-frequency magnetic near field produced by lightning. The incident filed is produced with a loop antenna driven by 12kA pulsed current and the field inside a 1m×1m×1m CFRP cavity is measured. Frequency domain transfer function of the shielding layer is analyzed based on time-domain measured waveforms. The result show CFRP has very small SE below 1MHz. The effect of such low frequency magnetic field within CFRP structure should be paid more attention in lightning protection.