A systematic comparison of on-axis and off-axis transmission Kikuchi diffraction

F. Niessen*, A. Burrows, A. Bastos da Silva Fanta

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Abstract The capabilities of the novel on-axis transmission Kikuchi diffraction (TKD) technique were explored in a systematic comparison with conventional off-axis TKD. The effect of experimental parameters on the appearance of on-axis and off-axis Kikuchi patterns was measured and discussed. In contrast to off-axis TKD, on-axis TKD is more sensitive to changes in beam current and beam energy and less sensitive to changes in working distance and detector distance. Moreover, on-axis TKD has a distinct advantage over off-axis TKD due to enhanced pattern intensity, which allows reduction of the beam current or an increase in the acquisition rate. The physical and effective spatial resolution were measured with detector-typical parameters. Even though the spatial resolution of both configurations did not differ significantly under test conditions, on-axis TKD enables measurement over large areas with the determined resolution, whereas off-axis TKD is more sensitive to beam drift. Band detection by the Hough-transform led to indexing of, on average, one additional Kikuchi band when measuring with on-axis TKD compared to off-axis TKD and operated more stable on on-axis patterns.
Original languageEnglish
JournalULTRAMICROSCOPY
Volume186
Pages (from-to)158-170
ISSN0304-3991
DOIs
Publication statusPublished - 2018

Keywords

  • Transmission Kikuchi diffraction
  • On-axis detector
  • Orientation mapping
  • Spatial resolution
  • Microstructure characterization

Cite this

@article{8f49284f2efb4c6d9c67933fb65e0516,
title = "A systematic comparison of on-axis and off-axis transmission Kikuchi diffraction",
abstract = "Abstract The capabilities of the novel on-axis transmission Kikuchi diffraction (TKD) technique were explored in a systematic comparison with conventional off-axis TKD. The effect of experimental parameters on the appearance of on-axis and off-axis Kikuchi patterns was measured and discussed. In contrast to off-axis TKD, on-axis TKD is more sensitive to changes in beam current and beam energy and less sensitive to changes in working distance and detector distance. Moreover, on-axis TKD has a distinct advantage over off-axis TKD due to enhanced pattern intensity, which allows reduction of the beam current or an increase in the acquisition rate. The physical and effective spatial resolution were measured with detector-typical parameters. Even though the spatial resolution of both configurations did not differ significantly under test conditions, on-axis TKD enables measurement over large areas with the determined resolution, whereas off-axis TKD is more sensitive to beam drift. Band detection by the Hough-transform led to indexing of, on average, one additional Kikuchi band when measuring with on-axis TKD compared to off-axis TKD and operated more stable on on-axis patterns.",
keywords = "Transmission Kikuchi diffraction, On-axis detector, Orientation mapping, Spatial resolution, Microstructure characterization",
author = "F. Niessen and A. Burrows and Fanta, {A. Bastos da Silva}",
year = "2018",
doi = "10.1016/j.ultramic.2017.12.017",
language = "English",
volume = "186",
pages = "158--170",
journal = "Ultramicroscopy",
issn = "0304-3991",
publisher = "Elsevier",

}

A systematic comparison of on-axis and off-axis transmission Kikuchi diffraction. / Niessen, F.; Burrows, A.; Fanta, A. Bastos da Silva.

In: ULTRAMICROSCOPY, Vol. 186, 2018, p. 158-170.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - A systematic comparison of on-axis and off-axis transmission Kikuchi diffraction

AU - Niessen, F.

AU - Burrows, A.

AU - Fanta, A. Bastos da Silva

PY - 2018

Y1 - 2018

N2 - Abstract The capabilities of the novel on-axis transmission Kikuchi diffraction (TKD) technique were explored in a systematic comparison with conventional off-axis TKD. The effect of experimental parameters on the appearance of on-axis and off-axis Kikuchi patterns was measured and discussed. In contrast to off-axis TKD, on-axis TKD is more sensitive to changes in beam current and beam energy and less sensitive to changes in working distance and detector distance. Moreover, on-axis TKD has a distinct advantage over off-axis TKD due to enhanced pattern intensity, which allows reduction of the beam current or an increase in the acquisition rate. The physical and effective spatial resolution were measured with detector-typical parameters. Even though the spatial resolution of both configurations did not differ significantly under test conditions, on-axis TKD enables measurement over large areas with the determined resolution, whereas off-axis TKD is more sensitive to beam drift. Band detection by the Hough-transform led to indexing of, on average, one additional Kikuchi band when measuring with on-axis TKD compared to off-axis TKD and operated more stable on on-axis patterns.

AB - Abstract The capabilities of the novel on-axis transmission Kikuchi diffraction (TKD) technique were explored in a systematic comparison with conventional off-axis TKD. The effect of experimental parameters on the appearance of on-axis and off-axis Kikuchi patterns was measured and discussed. In contrast to off-axis TKD, on-axis TKD is more sensitive to changes in beam current and beam energy and less sensitive to changes in working distance and detector distance. Moreover, on-axis TKD has a distinct advantage over off-axis TKD due to enhanced pattern intensity, which allows reduction of the beam current or an increase in the acquisition rate. The physical and effective spatial resolution were measured with detector-typical parameters. Even though the spatial resolution of both configurations did not differ significantly under test conditions, on-axis TKD enables measurement over large areas with the determined resolution, whereas off-axis TKD is more sensitive to beam drift. Band detection by the Hough-transform led to indexing of, on average, one additional Kikuchi band when measuring with on-axis TKD compared to off-axis TKD and operated more stable on on-axis patterns.

KW - Transmission Kikuchi diffraction

KW - On-axis detector

KW - Orientation mapping

KW - Spatial resolution

KW - Microstructure characterization

U2 - 10.1016/j.ultramic.2017.12.017

DO - 10.1016/j.ultramic.2017.12.017

M3 - Journal article

VL - 186

SP - 158

EP - 170

JO - Ultramicroscopy

JF - Ultramicroscopy

SN - 0304-3991

ER -