Physics – Optics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5490..151j&link_type=abstract
Advancements in Adaptive Optics. Edited by Domenico B. Calia, Brent L. Ellerbroek, and Roberto Ragazzoni. Proceedings of the SPI
Physics
Optics
6
Scientific paper
When doing high angular resolution imaging with adaptive optics (AO), it is of crucial importance to have an accurate knowledge of the point spread function associated with each observation. Applications are numerous: image contrast enhancement by deconvolution, improved photometry and astrometry, as well as real time AO performance evaluation. In this paper, we present our work on automatic PSF reconstruction based on control loop data, acquired simultaneously with the observation. This problem has already been solved for curvature AO systems. To adapt this method to another type of WFS, a specific analytical noise propagation model must be established. For the Shack-Hartmann WFS, we are able to derive a very accurate estimate of the noise on each slope measurement, based on the covariances of the WFS CCD pixel values in the corresponding sub-aperture. These covariances can be either derived off-line from telemetry data, or calculated by the AO computer during the acquisition. We present improved methods to determine 1) r0 from the DM drive commands, which includes an estimation of the outer scale L0 2) the contribution of the high spatial frequency component of the turbulent phase, which is not corrected by the AO system and is scaled by r0. This new method has been implemented in an IDL-based software called OPERA (Performance of Adaptive Optics). We have tested OPERA on Altair, the recently commissioned Gemini-North AO system, and present our preliminary results. We also summarize the AO data required to run OPERA on any other AO system.
Jolissaint Laurent
Marino Jose
Veran Jean Pierre
No associations
LandOfFree
OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and OPERA, an automatic PSF reconstruction software for Shack-Hartmann AO systems: application to Altair will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1809251