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Proceedings Paper

CASOAR: an infrared active wavefront sensor for atmospheric turbulence analysis
Author(s): Jean-Pierre Cariou; Agnes Dolfi-Bouteyre
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Paper Abstract

Knowledge of deformation of every point of a wave front over time allows statistical turbulence parameters to be analyzed, and the definition of real time adaptive optics to be designed. An optical instrumentation was built to meet this need. Integrated in a compact enclosure for experiments on outdoor sites, the CASOAR allows the deformations of a wave front to be measured rapidly (100 Hz) and with accuracy (1 deg). The CASOAR is an active system: it includes its own light source (CW CO2 laser), making it self-contained, self-aligned and insensitive to spurious light rays. After being reflected off a mirror located beyond the atmospheric layer to be analyzed (range of several kilometers), the beam is received and detected by coherent mixing. Electronic phase is converted in optical phase and recorded or displayed in real time on a monitor. Experimental results are shown, pointing out the capabilities of this device.

Paper Details

Date Published: 17 December 1992
PDF: 7 pages
Proc. SPIE 1714, Lidar for Remote Sensing, (17 December 1992); doi: 10.1117/12.138522
Show Author Affiliations
Jean-Pierre Cariou, ONERA (France)
Agnes Dolfi-Bouteyre, ONERA (France)

Published in SPIE Proceedings Vol. 1714:
Lidar for Remote Sensing
Richard J. Becherer; Christian Werner, Editor(s)

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