Physics – Optics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2201..381r&link_type=abstract
Proc. SPIE Vol. 2201, p. 381-392, Adaptive Optics in Astronomy, Mark A. Ealey; Fritz Merkle; Eds.
Physics
Optics
Scientific paper
In order to increase the corrected field of view in multi-conjugate adaptive optics we suggest a method for measuring and separating the contribution of atmospheric turbulent layers. The sodium layer serves as a huge screen, on which we project a wide fringe pattern from a single laser on the ground. A modified Hartmann-Shack sensor is employed to detect deformations in the pattern: sections of the fringe pattern are imaged by a lenslet array onto a large-format camera. Low layer turbulence causes overall shift of the fringe pattern in each lenslet, while high altitude turbulence results in internal deformations in the pattern, which are detected by that section of the camera which is behind each lenslet. Parallel Fourier analyses for the different lenslets allows separation of the atmospheric layers: the periodicity of the fringes lends itself to digital demodulation, which yields the deformations in the fringe. We present a statistical error analysis and simulations, showing good performance over a field of view of 80', compared to the performance expected of a conventional single sodium beacon, single adaptive mirror system.
Baharav Yael
Ribak Erez N.
Shamir Joseph
No associations
LandOfFree
Compensated imaging over arcminutes with fringes in the sodium layer 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 Compensated imaging over arcminutes with fringes in the sodium layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compensated imaging over arcminutes with fringes in the sodium layer will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1681639