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Elaboration d’un capteur hyperfréquence pour la mesure in situ de la densité des sédiments marins

Rassoul Mansour 1
1 Lab-STICC_UBO_MOM_DIM
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance, UBO - Université de Brest
Abstract : The characterization of marine sediments density is an essential source for identifying the nature of underwater soils. Many methods have been used to measure sediments density : radioactive, optical, acoustic and microwave. Following a thorough comparison between the different methods, the microwave methods were selected. The latter are based on the variation of the dielectric properties (complex permittivity) of the studied medium. Knowing that the purpose of our work is to integrate our microwave sensor on the Penfeld penetrometer fork that penetrates 30 m into the ground up to water depth of 6000 m, the patch antenna was chosen. Experimental measurements were made on laboratory-prepared samples based on kaolinite (representative of real sediments).After identifying the dielectric properties of these mixtures using a coaxial probe, several electromagnetic simulations on the Ansys HFSS software were performed to design the antennas optimized in our mixtures. The antennas were made experimentally : reflection and transmission measurements (resonance frequency and levels obtained with S parameters) were used to derive the sediment density and electrical conductivity.
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Rassoul Mansour. Elaboration d’un capteur hyperfréquence pour la mesure in situ de la densité des sédiments marins. Electronique. Université de Bretagne occidentale - Brest; Université Saint-Joseph (Beyrouth), 2020. Français. ⟨NNT : 2020BRES0046⟩. ⟨tel-03284347⟩

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