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Proceedings Paper • Open Access

SCALE: validations and prospects for a novel type of sounding lidar using short frequency combs
Author(s): Philippe J. Hébert; François Lemaître

Paper Abstract

As compared to near InfraRed passive instruments, lidars reduce the biases on the measurement of concentrations in the presence of diffusion by aerosols, but until recent days they were limited to one active wavelength at a time.

CNES and ONERA conceived a novel type of lidar based on short frequency combs that provides the spectrum of a complete absorption line of the target molecule. The technique of Dual Comb Spectroscopy is adapted to short (up to 13 teeth) combs, as a compromise between spectral richness and Signal to Noise Ratio. The advantages of DCS remain: reduction of the impact of scene evolutions and spectral mis-calibration. The latter will make the high power laser emitters easier. Above all, the acquisition of a complete absorption line opens the path to the retrieval of two or more independent elements in the vertical profile of molecule concentration.

We describe the technique of comb generation, the layout of the emitter section and the detection principles. Then we introduce the Short Comb Atmospheric Lidar Experiment (SCALE) project led by CNES in the frame of a new advance “phase 0” study. We expose the preliminary performances of this space lidar that could fit on a microsatellite platform in the case of CO2 sounding at 1.57 or 2 μm.

Results of CNES-ONERA four-year R&T activities are also presented that validate in the laboratory and in open space the short comb lidar.

Finally first results of retrieval simulations are exposed.

Paper Details

Date Published: 12 July 2019
PDF: 18 pages
Proc. SPIE 11180, International Conference on Space Optics — ICSO 2018, 111801T (12 July 2019);
Show Author Affiliations
Philippe J. Hébert, Ctr. National d'Études Spatiales (France)
François Lemaître, ONERA (France)


Published in SPIE Proceedings Vol. 11180:
International Conference on Space Optics — ICSO 2018
Zoran Sodnik; Nikos Karafolas; Bruno Cugny, Editor(s)

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