24-229 Differential Absorption Lidar for Water
Il y a 2 mois
Doctorat, 36 mois
- Temps plein
- Aucune expérience exigée
- Maitrise, IEP, IUP, Bac+4
- Meteorological Atmosphere
**Mission**:
The ONERA Laser Sources and Metrology (SLM) research unit is involved in the development of original Differential Absorption Lidar (DiAL) systems for greenhouse gases concentration measurement in the atmosphere, with the use of high power and broadly tunable parametric sources. The most recent work has demonstrated the first proof of concept for using the DiAL method in a spectral range around 2 µm to determine the relative abundance of semi-heavy water vapour isotopologue HDO, opening up new perspectives for understanding and modelling the transport and mixing of moist air masses in the various layers of the atmosphere [1,2]. Following on from this work, we propose to explore various complementary lines of research in order to advance the technique and meet the challenge of continuous observation of water vapour isotopes in the lower atmosphere:
- Improving the quality of the measurements through calibration and inter-comparison experiments. This could involve comparing the DiAL lidar with a reference instrument (ancillary lidar, radiosonde or in-situ sensor).
- Extend the field of measurement to CO2, and assess the contribution of previous improvements in the context of measuring CO2 concentration from space. Indeed, the spectral range around 2 µm is also favorable for measuring carbon dioxide using the DiAL method as part of a scenario for measuring concentration from space, but with requirements in terms of sensitivity that are still putting to the test the DiAL method state of art.
- Further development of wavelength measurement and control methods over a wide spectral range using heterodyning with a self-referencing frequency comb is also envisioned in a follow-up of the development in collaboration between ONERA and SpaceTech.
Depending on the opportunities, this work could be carried out in collaboration with external partners in France (LATMOS, LSCE), or international (SpaceTech GmbH) [3].
[2] J. Hamperl, et al. "Range-resolved detection of boundary layer stable water vapor isotopologues using a ground-based 1.98 µm differential absorption LIDAR," Opt. Express 30, 47199-47215 (2022).
[3] J. Hamperl, et al. "High Energy Parametric Laser Source and Frequency-Comb-Based Wavelength Reference for CO2 and Water Vapor DIAL in the 2 µm Region: Design and Pre-Development Experimentations," Atmosphere 12, 402 (2021).
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**Profil**:
Optics Instrumentation, lasers, Optronics, Spectroscopy, Atmospheric Science
**Laboratoire**:
ONERA
**MESSAGE from Phd Team**:
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