Status of Kikuchi Pattern Indexing for Electron Back Scatter Diffraction

Boekhold, Pieter van (2024) Status of Kikuchi Pattern Indexing for Electron Back Scatter Diffraction. Bachelor's Thesis, Applied Physics.

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Abstract

In this Bachelor's thesis, the indexing methods developed for Electron Back Scatter Diffraction are investigated and compared. The methods of indexing by Hough transformations, Dictionary Indexing and Spherical Harmonic indexing are described and later compared based on literature study. The traditional Hough Indexing (HI) method is found to be limited in noise robustness and failing in precision applications like resolving pseudo-symmetry, identifying phases with substantially different patterns and more. Dictionary Indexing (DI) was developed to resolve these problems with the use of dynamical diffraction simulations to simulate with high accuracy, the Kikuchi sphere of a crystal. From here, comparison to experimental patterns is possible. Spherical Harmonic Indexing (SHI) aims to overcome the major drawback of DI, namely computational difficulty. The use of spherical harmonics to approximate the experimental pattern and simulated Kikuchi sphere greatly improves the speed of DI and is able to reach similar speeds to HI while keeping superior indexing quality. These findings were tested on an experimental PZT dataset and mostly confirmed.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Ocelik, V. and Blake, G.R.
Degree programme:	Applied Physics
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	12 Jul 2024 09:16
Last Modified:	12 Jul 2024 09:16
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/33303

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