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Proceedings Paper • Open Access

WALES: water vapour lidar experiment in space
Author(s): F. Guerin; Th. Pain; J.-L. Palmade; E. Pailharey; D. Giraud; F. Jubineau

Paper Abstract

The WAter vapour Lidar Experiment in Space (WALES) mission aims at providing water vapour profiles with high accuracy and vertical resolution through the troposphere and the lower stratosphere on a global scale using an instrument based on Differential Absorption Lidar (DIAL) observation technique, and mounted on an Earth orbiting satellite.

This active DIAL technique will also provide data on the cloud coverage by means of the signal reflection on the cloud layers.

In DIAL operation, backscatter lidar signals at two wavelengths - at least - are detected. One wavelength (λ ON) is highly absorbed by the species of interest, while the other (λ OFF) is backscattered with minimal absorption. This difference in absorption at the two transmitted wavelengths leads to the determination of the concentration of the species of interest.

The DIAL is therefore a dual-wavelength lidar in which the signals detected at the two wavelengths are processed to extract the absolute density of water vapour.

The Phase A study performed by ALCATEL Space and their partners under contract of the European Space Agency has led to a credible and innovative concept of instrument, based on a mission performance modelling. The challenge is to foster the scientific return while minimising the development risks and costs of instrument development, in particular the laser transmitter.

The paper describes the payload design and the implementation on a low Earth orbiting (LEO) satellite.

Paper Details

Date Published: 21 November 2017
PDF: 9 pages
Proc. SPIE 10568, International Conference on Space Optics — ICSO 2004, 1056804 (21 November 2017); doi: 10.1117/12.2308009
Show Author Affiliations
F. Guerin, Alcatel Space (France)
Th. Pain, Alcatel Space (France)
J.-L. Palmade, Alcatel Space (France)
E. Pailharey, Alcatel Space (France)
D. Giraud, Alcatel Space (France)
F. Jubineau, Alcatel Space (France)

Published in SPIE Proceedings Vol. 10568:
International Conference on Space Optics — ICSO 2004
Josiane Costeraste; Errico Armandillo, Editor(s)

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