LIDAR DIAL multi espèces à base de sources paramétriques optiques pour la détection des gaz à effet de serre depuis l'espace.

Abstract : Sustained and accurate greenhouse gases measurements at a global scale are required to improve the knowledge on their sources and sinks and thus increase the accuracy of climate change projections. In order to consolidate the global observation networks, spaceborne lidar systems for future earth observation missions are regarded as innovative and complementary components to the present operational measurement methods. In this context, this research work has consisted in developing a differential absorption DIAL lidar based on an optical parametric source able to emit in the 1,9–2,3 µm spectral range. The purpose was to demonstrate its ability to be implemented in long range measurements of the main greenhouse gases (CO2, H2O, CH4). Then, the laser transmitter has been integrated in a lidar architecture which was previously designed using a numerical model. Improvements and optimization of the lidar system focused on two aspects: the monitoring of the spectral purity of the emitter and the control of the detection and acquisition. Concentration measurements on the three gases have been carried out from the laboratory based on atmospheric backscattered signals from clouds and aerosol. These measurements provided a basis for the investigation of the error and bias sources. On the basis of these measurements, instrument scaling for future airborne demonstrations is discussed. Projected performances of a spaceborne instrument are also presented.
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Erwan Cadiou. LIDAR DIAL multi espèces à base de sources paramétriques optiques pour la détection des gaz à effet de serre depuis l'espace.. Optique / photonique. Université Paris-Saclay, 2017. Français. ⟨NNT : 2017SACLX102⟩. ⟨tel-01739914⟩

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