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Proceedings Paper

Atmospheric dispersion compensation for ELTs
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Paper Abstract

This paper summarises the problems related to atmospheric dispersion (AD), both active (angular dispersion due to change in the telescope zenith angles) and adaptive (the atmospheric turbulence depends on wavelength since the refractive index and r0 are also wavelength dependent). We compare the AO effects and its compensation by deformable mirrors (achromatic by definition and incapable of compensating the atmospheric dispersion) using GLAO and LTAO with those of the atmospheric dispersion. We present preliminary optical designs for ADCs in Euro50 and E-ELT to compensate the zenith dependence dispersion of the atmosphere.

Paper Details

Date Published: 22 April 2008
PDF: 8 pages
Proc. SPIE 6986, Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg, 69860H (22 April 2008); doi: 10.1117/12.801274
Show Author Affiliations
E. Atad-Ettedgui, UKATC, Royal Observatory Edinburgh (United Kingdom)
A. S. Goncharov, National Univ. of Ireland, Galway (Ireland)


Published in SPIE Proceedings Vol. 6986:
Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg

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