Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/6331
Title: Digital Shack-Hartmann wavefront sensing
Authors: Rinov Herawan.
Keywords: DRNTU::Engineering::Mechanical engineering::Control engineering
Issue Date: 2005
Abstract: Wavefront sensor is designed to measure both intensity distribution and phase distortion of optical fields in real time and high accuracy. It can be widely used not only in measuring, diagnostic, but also in adaptive opticaI systems to compensate for phase distortions. The most well known and widely used Shack-Hartmann wavefront sensor consists of a lenslet array and a CCD camera. The wavefrontsurface under test is divided into a number of beamlets by a two-dimensional sub-apertures of the lenslet array, and each sub-aperture provides a separate focus on the detector of a CCD camera .Then the image spot arraycaptured by CCD can be used to estimate the wavefront local slopes. The centroids of sub-images generated by each lenslet are tested and the sensor output is a set of {x,y}spot positions. Since the SHWS has some advantages for wavefront measuring of a laser beam with a large aperture, and the noise properties of this sensor are well determinedand it is simple to operate sucha sensor, SHWS became the most popularwavefront sensor for adaptive optics. Generally, the wavefrontestimation procedure may be categorized as e
URI: http://hdl.handle.net/10356/6331
Rights: Nanyang Technological University
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MAE Theses

Files in This Item:
File Description SizeFormat 
MAE-THESES_792.pdf
  Restricted Access
20.47 MBAdobe PDFView/Open

Page view(s)

232
Updated on Nov 25, 2020

Download(s)

5
Updated on Nov 25, 2020

Google ScholarTM

Check

Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.