| Issue |
A&A
Volume 429, Number 2, January II 2005
|
|
|---|---|---|
| Page(s) | 747 - 753 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361:20040270 | |
| Published online | 17 December 2004 | |
Sensitivity of a “dispersed-speckles” piston sensor for multi-aperture interferometers and hypertelescopes
1
Collège de France & Laboratoire d'Interférométrie Stellaire et Exo-planétaire LISE-Observatoire de Haute-Provence - CNRS, 04870 Saint-Michel l'Observatoire, France e-mail: borkowski@obs-hp.fr
2
Alcatel Space Industries, 100 bd du Midi, BP 99, 06156 Cannes la Bocca Cedex, France
3
Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USA
Received:
13
February
2004
Accepted:
2
September
2004
In multi-aperture interferometers and hypertelescopes, the piston errors can be determined from multi-spectral images of the speckle pattern using a 3-dimensional Fourier transform. We study the limiting magnitude of the method in the case of non-redundant apertures using analytical derivations and numerical simulations. We show specifically for the case of sub-r0 apertures that a few photons per aperture within the full spectral bandwidth will suffice to measure piston errors. The method's sensitivity is thus comparable to that of the Shack-Hartmann and other methods used with monolithic apertures.
Key words: turbulence / techniques: interferometric / atmospheric effects
© ESO, 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.