Type
ThesisAuthors
Wang, Congli
Advisors
Heidrich, Wolfgang
Committee members
Ghanem, Bernard
Wonka, Peter

Date
2016-12Embargo End Date
2017-12-07Permanent link to this record
http://hdl.handle.net/10754/621951
Metadata
Show full item recordAccess Restrictions
At the time of archiving, the student author of this thesis opted to temporarily restrict access to it. The full text of this thesis became available to the public after the expiration of the embargo on 2017-12-07.Abstract
Wavefront sensing is an old yet fundamental problem in adaptive optics. Traditional wavefront sensors are limited to time-consuming measurements, complicated and expensive setup, or low theoretically achievable resolution. In this thesis, we introduce an optically encoded and computationally decodable novel approach to the wavefront sensing problem: the Coded Shack-Hartmann. Our proposed Coded Shack-Hartmann wavefront sensor is inexpensive, easy to fabricate and calibrate, highly sensitive, accurate, and with high resolution. Most importantly, using simple optical flow tracking combined with phase smoothness prior, with the help of modern optimization technique, the computational part is split, efficient, and parallelized, hence real time performance has been achieved on Graphics Processing Unit (GPU), with high accuracy as well. This is validated by experimental results. We also show how optical flow intensity consistency term can be derived, using rigor scalar diffraction theory with proper approximation. This is the true physical law behind our model. Based on this insight, Coded Shack-Hartmann can be interpreted as an illumination post-modulated wavefront sensor. This offers a new theoretical approach for wavefront sensor design.Citation
Wang, C. (2016). Coded Shack-Hartmann Wavefront Sensor. KAUST Research Repository. https://doi.org/10.25781/KAUST-L6NY5ae974a485f413a2113503eed53cd6c53
10.25781/KAUST-L6NY5