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Journal of Biomedical Optics • Open Access

Shack-Hartmann wavefront sensor with large dynamic range
Author(s): Mingliang Xia; Chao Li; Lifa Hu; ZhaoLiang Cao; QuanQuan Mu; Xuan Li

Paper Abstract

A new spot centroid detection algorithm for a Shack-Hartmann wavefront sensor (SHWFS) is experimentally investigated. The algorithm is a kind of dynamic tracking algorithm that tracks and calculates the corresponding spot centroid of the current spot map based on the spot centroid of the previous spot map, according to the strong correlation of the wavefront slope and the centroid of the corresponding spot between temporally adjacent SHWFS measurements. That is, for adjacent measurements, the spot centroid movement will usually fall within some range. Using the algorithm, the dynamic range of an SHWFS can be expanded by a factor of three in the measurement of tilt aberration compared with the conventional algorithm, more than 1.3 times in the measurement of defocus aberration, and more than 2 times in the measurement of the mixture of spherical aberration plus coma aberration. The algorithm is applied in our SHWFS to measure the distorted wavefront of the human eye. The experimental results of the adaptive optics (AO) system for retina imaging are presented to prove its feasibility for highly aberrated eyes.

Paper Details

Date Published: 1 March 2010
PDF: 10 pages
J. Biomed. Opt. 15(2) 026009 doi: 10.1117/1.3369810
Published in: Journal of Biomedical Optics Volume 15, Issue 2
Show Author Affiliations
Mingliang Xia, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Chao Li, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Lifa Hu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
ZhaoLiang Cao, Changchun Institute of Optics, Fine Mechanics and Physics (China)
QuanQuan Mu, Changchun Institute of Optics, Fine Mechanics and Physics (China)
Xuan Li, Changchun Institute of Optics, Fine Mechanics and Physics (China)


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