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An electromagnetic pulse due to a nearby lightning stroke generates a high intensity magnetic field. Thin metal layers as applied in composite structures cannot shield such a magnetic field. Electronic equipment inside such structures will suffer from high-induced voltages and damage and interference will occur. If a lightning stroke hits the composite structure directly the material will be damaged due to the heat generated in the composite material. A direct lightning stroke is even more complex. The current path for the fast transient and the long tail, with the largest portion of the energy, is different, and different protection measures have to be developed. |
