EDP Sciences
Free access
Issue A&A
Volume 369, Number 2, April II 2001
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010219



A&A 369, L9-L12 (2001)
DOI: 10.1051/0004-6361:20010219

Pyramid Wavefront Sensor behavior in partial correction Adaptive Optic systems

S. Esposito and A. Riccardi

Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, 50125 Firenze, Italy

(Received 20 November 2000 / Accepted 7 February 2001)

Abstract
In this letter we evaluate the limiting magnitude for a Pyramid Sensor operating in a closed loop astronomical Adaptive Optics system. A first heuristic analysis has shown that, when a point-like reference source is used a pyramid sensor exhibits a significant gain in terms of limiting magnitude over the widely used Shack-Hartmann sensor. This when diffraction limited conditions are reached. However, in current astronomical Adaptive Optics, diffraction limited regime at the sensing wavelength is difficult to achieve. Our simulations quantify the pyramid sensor limiting magnitude considering an Adaptive Optics system working in a partial correction regime. The simulations show that the considered gain is retained even in partial correction. An average gain of two magnitude is found in the considered case. This feature of a pyramid sensor can be very important in reducing the fundamental limit of today's Astronomical Adaptive Optics systems using natural reference sources, i.e. the limited sky-coverage.


Key words: atmospheric effects -- instrumentation: adaptive optics

Offprint request: S. Esposito, esposito@arcetri.astro.it




© ESO 2001

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)