Publication:
Characterization of optical aberrations: practical implementation of a Shack-Hartmann sensor with Matlab

Date

2019

Authors

Belío Apaolaza, Íñigo

Publisher

Acceso abierto / Sarbide irekia
Trabajo Fin de Grado / Gradu Amaierako Lana

Project identifier

Abstract

In cataract surgery, the clouded natural lens is replaced by an artificial lens called intra ocular lens (IOL). These lenses need to be correctly characterized for a successful surgery outcome, in order to avoid or compensate optical aberrations in the human vision system. In this thesis, an implementation of Shack-Hartmann wavefront reconstruction and characterization system is developed in MATLAB, with the objective to improve the performance of the standard software of a commercial sensor. Multiple approaches were implemented, focusing on optimizing correlation-based centroiding. Simulations were carried out to test the performance of different technique for noise cancelling and range extension, with a simple simulation environment developed in this thesis. Results show success on optimizing correlation-based centroiding, representing the closest technique to optimum in the majority of scenarios, and highlight the big impact that domain of reconstruction has in the system results. In conclusion, the system developed is flexible, implements a nice variety of options for adapting to different situations and provides the tools for testing and conducting research on the performance of Shack-Hartmann sensors. In addition, it is highly susceptible to modifications and improvements, and offers a solid alternative to the commercial sensor.

Description

Keywords

Shack-Hartmann, Wavefront sensing, IOL, Centroiding methods, Correlation centroiding

Department

Faculty/School

Escuela Técnica Superior de Ingenieros Industriales y de Telecomunicación / Telekomunikazio eta Industria Ingeniarien Goi Mailako Eskola Teknikoa / Technikum Wien (Austria)

Degree

Graduado o Graduada en Ingeniería en Tecnologías de Telecomunicación por la Universidad Pública de Navarra, Telekomunikazio Teknologien Ingeniaritzako Graduatua Nafarroako Unibertsitate Publikoan

Doctorate program

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