Physics – Optics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasp..106..182t&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 106, no. 696, p. 182-188
Physics
Optics
4
Adaptive Optics, Error Correcting Devices, Optical Correction Procedure, Synthetic Apertures, Wave Front Reconstruction, Kolmogorov Theory, Phase Error
Scientific paper
We have evaluated the wavefront reconstruction error for Shack-Hartmann wavefront sensors based on a series of simulations for various numbers of subapertures at various levels of measurement error in determining the Hartmann spot centroids. The optimum number of subapertures is derived for a given magnitude reference star in the cases of photon-noise-limited and detector-noise-limited sensors. When the centroid measuring error is absent, the maximum number of Zernike terms that can be corrected by means of modal adaptive compensation is about 1/5 of the number of subapertures. The residual phase error in wavefront reconstruction is shown to be sensitive to the measuring error of the spot centroids. It is essential to reduce the centroid measuring error in wavefront sensors for high-level adaptive optics systems with a large number of degrees of freedom.
Iye Masanori
Takato Naruhisa
Yamaguchi Ichirou
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