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Conference papers

Direct detection range resolved carbon dioxide differential absorption lidar measurements in the 2 μm range

Abstract : Prevision of climate change is presently one of the main research goals. In order to improve the accuracy of current climate models, it is necessary to better characterize the main greenhouse gases concentration and fluxes (CO2, CH4, and water vapor) at a global scale. For this purpose one promising solution is the space-borne integrated path differential absorption lidar (IP-DIAL) technique, which is currently investigated by space agencies in the preparation of future missions such as MERLIN (CNES-DLR) for methane, or ASCENDS (NASA) for carbon dioxide. One of the challenges for these missions is to have high energy laser sources which can emit specific wavelength to address the species of interest. At ONERA, a high energy transmitter based on a broadly tunable parametric source has been developed in the 2 μm spectral region to address the main greenhouse gases absorption lines that are well-suited for space application. This source has been recently implemented on the R30 CO2 absorption line at 2051 nm for ground-based range resolved measurements in the atmosphere. In our set-up the source emits 10 mJ pulses at a 30 Hz repetition rate. The backscattered light from aerosols is collected with a Newton telescope and a direct detection scheme based on an InGaAs photodiode. CO2/sub> concentration has been estimated with a precision better than 25 ppm for a 200-meter spatial resolution in the 100-500 m range and a 10 minutes acquisition time.
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Submitted on : Thursday, February 1, 2018 - 2:47:50 PM
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Erwan Cadiou, Jean-Baptiste Dherbecourt, Guillaume Gorju, Jean-Michel Melkonian, Antoine Godard, et al.. Direct detection range resolved carbon dioxide differential absorption lidar measurements in the 2 μm range. Proceedings SPIE 10215, Advanced Environmental, Chemical, and Biological Sensing Technologies XIV, 102150L, 2017, Anaheim, California, United States. 7 p., ⟨10.1117/12.2262497⟩. ⟨insu-01698593⟩



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