Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism

Details Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.7015e.133w&link_type=abstract

Adaptive Optics Systems. Edited by Hubin, Norbert; Max, Claire E.; Wizinowich, Peter L. Proceedings of the SPIE, Volume 7015

Physics

Optics

Scientific paper

We investigate the effect of atmospheric phase and scintillation anisoplanatism on the measurement of the local gradient of the wavefront using a Hartmann-Shack type wavefront sensor. This is accomplished by simulation of the imaging process, starting with 100 synthetic, anisoplanatic phase and scintillation screens that were computed for several viewing angles and that correspond to Fried parameters of 7 and 12 cm. The screens are calculated using the approximated turbulence profile at the site selected for the ATST, Haleakala on Maui, Hawaii, USA. Phase aberrations are propagated through the wavefront sensor, considering each viewing angle in each subaperture (of adjustable size) separately. The point spread functions (PSF) are calculated for the viewing directions as well as specified (and adjustable) pixel scale in the sensor camera. Subsequently, these PSFs are convolved with a typical wavefront sensor lock structure of solar AO systems, an image of solar granulation. The cross-correlation peak of the thus created anisoplanatic subimages is finally used to find the local gradients of the wavefront. We find that phase anisoplanatism contributes significantly to the measurement error of a Hartmann-Shack type wavefront sensor, whereas we cannot detect a notable increase thereof from scintillation anisoplanatism in the subaperture when using a cross-correlating algorithm to find the gradient of the incident wavefront.

Affiliated with

Also associated with

No associations

Rating

Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism 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 Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wavefront measurement error in a Hartmann-Shack-type wavefront sensor due to field anisoplanatism will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-792254