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The ARIANE 5 launcher shall withstand an on-ground direct lightning stroke of 5 kA or an indirect stroke of 200 kA arising on its launch pad protection system. The definition of indirect effects protections has been performed on the basis of a simplified modelisation of electromagnetic coupling. The lightning qualification has been achieved by both theoretical analysis, based on a very accurate modelisation, and various tests performed at unit and subassembly levels. This process has shown that global compatibility is ensured.

The aim of the present work is to find a pertinent parameter characterizing gaskets, such as used in joints in metallic enclosures, over the [100kHz - 100MHz] frequency band. The proposed test device provides a frequency measure of the coupling, between two wires placed on both sides of the assembly. We can then define an equivalent generator on the reception line. Then, starting from Latham’s analysis [1], we have obtained a pertinent parameter considered as a transfer impedance. This transfer impedance behaves, at low frequencies, like a surface impedance and thus can be taken into account in numerical codes, as, for example, codes based on the EFIE. We have modeled our experimental device and we have used the above technique to characterize an elastomer gasket in an overlap-type joint.