Diode laser spectroscopy instrument M-DLS for in situ study of atmosphere near the Martian surface: design, assembly, alignment and calibration

I I Vinogradov,G Durry,J Cousin,M Ghysels-Dubois,T O Kozlova,I V Golovnin,S V Malashevich,S G Zenevich,A A Venkstern,O Z Roste,V V Barke,I Sh Gazizov,A V Nosov,V V Meshcherinov,A V Rodin,M V Spiridonov,Yu V Lebedev,V A Kazakov

doi:10.1109/iclo48556.2020.9285784

Abstract

An application of tunable diode laser absorption spectroscopy (TDLAS) in combination with integrated cavity output spectroscopy (ICOS) was proposed for Martian atmosphere study, and has been implemented as a Martian multichannel diode laser spectrometer, or M-DLS instrument. Before its scheduled delivery to the ExoMars-2020 Landing Platform, the M-DLS instrument has been carefully calibrated, representing optimal coupling of monochromatic DFB-lasers with the ICOS analytical volume, and radical enhancement of efficient optical path inside the ICOS, and resulting sub-percent accuracy for planned short-time and seasonal in situ measurement of D/H, 18O/17O/16O, 13C/12C ratios and H 2 O, CO 2 content variations of gas probes, to be sampled from the extremely low-pressure atmosphere near the Martian surface during the ExoMars-2020 mission.

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