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Sample positioning in neutron diffraction experiments using a multi-material fiducial marker

Marais, D.; Venter, A.; Markgraaff, J. and James, J. (2017). Sample positioning in neutron diffraction experiments using a multi-material fiducial marker. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 841 pp. 12–16.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.nima.2016.10.020
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Abstract

An alternative sample positioning method is reported for use in conjunction with sample positioning and experiment planning software systems deployed on some neutron diffraction strain scanners. In this approach, the spherical fiducial markers and location trackers used with optical metrology hardware are replaced with a specifically designed multi-material fiducial marker that requires one diffraction measurement. In a blind setting, the marker position can be determined within an accuracy of ±164 µm with respect to the instrument gauge volume. The scheme is based on a pre-determined relationship that links the diffracted peak intensity to the absolute positioning of the fiducial marker with respect to the instrument gauge volume. Two methods for establishing the linking relationship are presented, respectively based on fitting multi-dimensional quadratic functions and a cross-correlation artificial neural network.

Item Type: Journal Item
Copyright Holders: Elsevier
ISSN: 0168-9002
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 47646
Depositing User: Jon James
Date Deposited: 21 Oct 2016 09:00
Last Modified: 21 Oct 2016 10:22
URI: http://oro.open.ac.uk/id/eprint/47646
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