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Proceedings Paper

Aladin Telescope stability verification using a Hartmann wavefront sensor
Author(s): M. Schillinger; F. Delbru; C. Meisse; D. Hours
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Paper Abstract

The ALADIN Instrument is a Doppler Wind Lidar aboard the ESA Core Explorer Aeolus Mission. The main purpose of this payload is the measurement of tropospheric wind profiles on a global scale. The concept is based on a solid-state Nd:YAG laser associated with a direct detection frequency receiver. An optical structural and thermal model (OSTM) of the instrument has been developed to validate at an early stage of the programme the stability of the instrument. In particular, the WFE and defocus stability of the 1.5 m diameter Silicon Carbide Telescope is a critical issue regarding instrument performances. In order to test the WFE and defocus stability under thermal vacuum, a dedicated sensor has been developed. This Sensor is based on the Shack Hartman principle. The aim of the sensor is to measure the telescope primary mirror deformations in a confocal configuration by adapting a set of small mirrors on the mirror surface. The challenge was to keep these mirrors stable to better than 0.1μm decenter/0.1μrd rotation to allow unbiased monitoring of the WFE and defocus under thermal vacuum. Experimental results show the high measurement sensitivity achieved by the Hartman optical sensor.

Paper Details

Date Published: 26 April 2008
PDF: 10 pages
Proc. SPIE 7003, Optical Sensors 2008, 70031H (26 April 2008); doi: 10.1117/12.778990
Show Author Affiliations
M. Schillinger, EADS Astrium Satellites (France)
F. Delbru, EADS Astrium Satellites (France)
C. Meisse, EADS Astrium Satellites (France)
D. Hours, EADS Astrium Satellites (France)


Published in SPIE Proceedings Vol. 7003:
Optical Sensors 2008
Francis Berghmans; Anna Grazia Mignani; Antonello Cutolo; Patrick P. Meyrueis; Thomas P. Pearsall, Editor(s)

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