Search Results

A three years analysis has been carried out inside the scope of the 4th framework programme driven by the European Commission. The objectives of this analysis were consisting of the development of three complementary tools required for the electromagnetic susceptibility analysis of a ground facility. - a new methodology approach based on critical coupling functions evaluation - a test equipment allowing a quantitative determination of these coupling functions - a numerical tool, based on the electromagnetic topology concept (ONERA CRIPTE code), which, by comparison with tests results, gives the evaluation of the full threat susceptibility of critical operational functions and conducts to the definition of pertinent electromagnetic protection to be applied on the ground facility. The definition and the characteristics of the three tools are presented. Experiments conducted on specific ground facilities are described.

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.