Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope

Details Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3356.1190l&link_type=abstract

Proc. SPIE Vol. 3356, p. 1190-1201, Space Telescopes and Instruments V, Pierre Y. Bely; James B. Breckinridge; Eds.

Physics

Optics

1

Scientific paper

We are developing a technique to measure segment misalignment of large telescopes based on wavefront estimation using phase-diverse images. We report the current results of an experiment to measure piston errors on the Keck II primary segmented mirror, through atmospheric turbulence, using phase-diverse phase retrieval. The segment piston errors are separated from the random turbulence by averaging phase estimates from many frames. Phase estimates from real data collected with segments intentionally moved in piston reproduce the observed speckle patterns well. However, average phase maps do not reveal the segment piston errors. Simulations show that the observed data were collected in a regime of turbulence where the current algorithm often fails, but would be expected to work very well when the adaptive optics system is operating. There is reason to believe that we can eventually make the algorithm work with these or similar data if apparent mismatches between the data and our current imaging model are removed.

Affiliated with

Also associated with

No associations

Rating

Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope 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 Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Phase diversity experiment to measure piston misalignment on the segmented primary mirror of the Keck II Telescope will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1540477