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Contribution au développement d'un moyen d'essais CEM utilisant une chambre réverbérante à brassage de modes : conception et intégration d'une enceinte thermo-régulée pour essais multiphysiques

Abstract : This thesis deals with the analysis by experimentation of the effect of the load on the statistical properties of the electromagnetic field measured inside the working volume of the Mode-Stirred Reverberation Chamber (MSRC), also the development of a new application of the MSRC to perform radiated immunity testing in combination of the heat stress and the electromagnetic aggression. At first, we focus on assessing the key calibration parameters in the case of an empty chamber or in the presence of one or more RF absorbing objects. Particular attention was reserved to the number of antenna positions chosen for the data measurements. Indeed, the current standards dealing with reverberation chamber measurements provide very little explanation as to the number of required antenna positions, and a minimum of information on the influence of the load on the electromagnetic behavior of the chamber. The statistical distribution functions of field and power measurements inside the working volume are evaluated using statistical goodness-of-fit tests. We show empirically that the independence of samples taken over a stirrer revolution will deteriorates if one or more RF absorbing objects are introduced inside the chamber, it could result in an illusory better fitting between the experimental data distributions and the theoretical distributions. This confusion is the source of misinterpretation in the improvement of the statistical properties of the MSRC field below its lowest usable frequency (LUF). We also provide clarifications on the minimum number of antenna positions to perform measurements in a MSRC. In a second time, we implement an experimental protocol allowing a better understanding of the load level variation based on physical parameters and spatial position of absorbing objects introduced inside a MSRC. This investigation provides answers on how equipment under test loads a chamber, and highlights the relationship between the load level and the absorption cross section of the object instead of its volume. In fact, recent scientific studies having recommended not exceeding the ratio of 8% of the total volume of the chamber for the equipment under test seem to be incomplete. Indeed, the only parameter of the volume is insufficient to determine the level of load. Finally, we present an application of EMC measurements using the MSRC in an EMC context and multiphysical measurements. The development of an EMC-Thermal stress test bench to be integrated to the MSRC without changing its electromagnetic behavior, based in part on the results of this thesis, allows adapting it to meet the testing requirements of multiphysical characterization of automotive mechatronic equipments. We show the measurements results of radiated immunity of automotive equipment subject to heat stress and investigating the influence of temperature on the radiated immunity of such equipment.
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Submitted on : Thursday, October 8, 2020 - 2:50:06 PM
Last modification on : Thursday, March 10, 2022 - 10:46:02 AM


  • HAL Id : tel-02961488, version 1


H. Boulzazen. Contribution au développement d'un moyen d'essais CEM utilisant une chambre réverbérante à brassage de modes : conception et intégration d'une enceinte thermo-régulée pour essais multiphysiques. Micro et nanotechnologies/Microélectronique. Université de Rouen Normandie, 2011. Français. ⟨tel-02961488⟩



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