Astigmatism Effect on Fourier Transform
- Practical Electron Microscopy and Database -
- An Online Book -

http://www.globalsino.com/EM/  



 
This book (Practical Electron Microscopy and Database) is a reference for TEM and SEM students, operators, engineers, technicians, managers, and researchers.
 

=================================================================================

Astigmatism is a non-azimuthally-symmetric lens aberration. It can be described by adding an azimuth dependent term to the phase shift function. This term is given by, [page4236]

         Astigmatism effect on phase shift function -------------------- [1707]

The anisotropy of the astigmatism has the effect of averaging-out the higher frequency extrema in the radially averaged Fourier spectrum and thus depresses the high-frequency radial Fourier spectrum.

 

 

=================================================================================

The book author (Yougui Liao) welcomes your comments, suggestions, and corrections, please click here for submission. You can click How to Cite This Book to cite this book. If you let Yougui Liao know once you have cited this book, the brief information of your publication will appear on the “Times Cited” page.



 
 
 
Copyright (C) 2006 GlobalSino, All Rights Reserved