Aladin Telescope stability verification using a Hartmann wavefront sensor

M. Schillinger; F. Delbru; C. Meisse; D. Hours

doi:10.1117/12.778990

26 April 2008 Aladin Telescope stability verification using a Hartmann wavefront sensor

M. Schillinger, F. Delbru, C. Meisse, D. Hours

Proceedings Volume 7003, Optical Sensors 2008; 70031H (2008) https://doi.org/10.1117/12.778990
Event: SPIE Photonics Europe, 2008, Strasbourg, France

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.

Citation Download Citation

M. Schillinger, F. Delbru, C. Meisse, and D. Hours "Aladin Telescope stability verification using a Hartmann wavefront sensor", Proc. SPIE 7003, Optical Sensors 2008, 70031H (26 April 2008); https://doi.org/10.1117/12.778990

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