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Mesure par radiomètres ICOTOM et validation des flux radiométriques dans un plasma de CO2 pur simulant des conditions d'entrée de type EXOMARS

Abstract : When an object is entering the atmosphere of Mars at hypersonic speeds, a detached shock layer is forming in front of the said object accompanied by a high-enthalpy non-equilibrium plasma with high radiative intensity. Several studies have already been conducted about the necessary protective layer for the object to withstand such physico-chemical conditions, however the chemical phenomena concerning CO2 recombination around the back of the object are not too well known ; the radiative quantities coming from this recombination are often given with large error margins because of this. It is particularly the case in the infrared, that is why the French Space Agency developed two radiometers designed for mesuring radiative heat fluxes emitted by CO and CO2 during a martian flight. It seems relevant to calibrate these sensors for quantitative measurements of radiative heat fluxes in flight conditions and to study the recombination of a pure CO2 plasma in laboratory conditions. The radiometers have been calibrated in front of a blackbody source ; concerning the state of the laboratory plasma created by an inductive plasma torch, a study of the laser-induced spontaneous Raman scattering on CO and of two-photon absorption laser-induced fluorescence on O have been conducted, enabling evaluation of both temperatures and densities of the probed species, and so give an estimate on the plasma recombination state.
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Submitted on : Monday, March 16, 2020 - 2:45:13 PM
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  • HAL Id : tel-02509115, version 1

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Mickael Jacquot. Mesure par radiomètres ICOTOM et validation des flux radiométriques dans un plasma de CO2 pur simulant des conditions d'entrée de type EXOMARS. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Normandie Université, 2019. Français. ⟨NNT : 2019NORMR121⟩. ⟨tel-02509115⟩

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