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Intrinsic limitations of Shack-Hartmann wavefront sensing on an extended laser guide source
- Source :
- Journal of the Optical Society of America. A Optics, Image Science, and Vision, Journal of the Optical Society of America. A Optics, Image Science, and Vision, 2010, 27, pp.171. ⟨10.1364/JOSAA.27.00A171⟩
- Publication Year :
- 2010
-
Abstract
- In this paper we investigate the behavior of various centroiding methods (weighted center of gravity, matched filtering, and correlation) classically used in Shack–Hartmann wavefront sensing when dealing with an elongated asymmetric spot. We study the impact of model errors on these centroiding methods at high signal-to-noise ratios, and, using a one-dimensional formalism, we show that the associated estimates all suffer from a bias uncorrelated with the actual spot displacement if its shape is not known precisely. Additionally, we show that the correlation method provides an estimate with a unitary gain whatever the parameters used, while the other two methods introduce a non-unitary gain in the estimation process. Finally, we show that the sampling of the spot structures after filtering by some convolution kernels is crucial to get an unbiased estimate of the spot displacement.
- Subjects :
- Wavefront
Physics
business.industry
Laser
Atomic and Molecular Physics, and Optics
Uncorrelated
Electronic, Optical and Magnetic Materials
law.invention
Formalism (philosophy of mathematics)
Center of gravity
Optics
law
Correlation method
Computer Vision and Pattern Recognition
Spatial frequency
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Adaptive optics
business
Subjects
Details
- ISSN :
- 15208532 and 10847529
- Volume :
- 27
- Issue :
- 11
- Database :
- OpenAIRE
- Journal :
- Journal of the Optical Society of America. A, Optics, image science, and vision
- Accession number :
- edsair.doi.dedup.....7eb367bac7b2d7b1074b7c7b29f70d87