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Etude théorique et expérimentale des techniques de retournement temporel : application à la caractérisation de composants et dispositifs dans une chambre réverbérante

Abstract : In the framework of our research work, we present an innovative system which allows to control the spatio-temporal distribution of a coherent field in an strongly reflecting environment. This system called " Time reversal electromagnetic chamber" (TREC), makes possible the generation of high intensity pulsed wavefront, in a reverberating chamber, and whose direction of propagation and polarisation are modifieable in real time without any mechanical mouvement of neither the sources generating the field, here radio antennas, nor the equipment under test.For this, the TREC is based on knowledge of the field on an arbitrary surface of measurement, located between the sources and the object under test, in the direction of propagation of the wavefront desired. This phase of characterization may be performed with the help of a measurement of the transfer functions between the port of the antennas and a field probe moved on the arbitrary surface of measurement.The principle of the TREC is based on the association of the technique of time reversal and of the principle of equivalence. Time reversal allows to ensure a temporal window in which the conditions of propagation of the field in the reverberation chamber are identical to those in free space and which allows to obtain a propagation of a wavefront converging towards a punctual source which would initially have created a diverging wavefront. The equivalence principle allows to go from a punctual source to a an extended source of radiation, thus allowing to create an arbitrary spatial distribution of the field and thereby to control its direction of propagation.This new system was validated with the help, at first, of a set of numerical exploratory simulations in order to determine the influential parameters on its performance and then studied from measurements carried out in the reverberation chamber of the ``Département de recherche en électromagnétisme'', at Supélec, thus demonstrating experimentally the feasibility and the interest of the development of this testing facility for the generation of pulsed coherent wavefronts, complementary to the current use mode-stirred reverberation chambers.
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https://tel.archives-ouvertes.fr/tel-00625945
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Submitted on : Thursday, February 2, 2012 - 10:59:20 AM
Last modification on : Sunday, June 26, 2022 - 11:55:26 AM
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Houmam Moussa. Etude théorique et expérimentale des techniques de retournement temporel : application à la caractérisation de composants et dispositifs dans une chambre réverbérante. Electromagnétisme. Université Paris Sud - Paris XI, 2011. Français. ⟨NNT : 2011PA112106⟩. ⟨tel-00625945v2⟩

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