Experimental determination of precision, resolution, accuracy and trueness of time-of-flight neutron diffraction strain measurements

I. C. Noyan; J. R. Bunn; M. K. Tippett; E. A. Payzant; B. Clausen; D. W. Brown

doi:10.1107/S1600576720002150

Experimental determination of precision, resolution, accuracy and trueness of time-of-flight neutron diffraction strain measurements

I. C. Noyan, J. R. Bunn, M. K. Tippett, E. A. Payzant, B. Clausen, D. W. Brown

Materials Engineering

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

A simple statistical analysis which yields the precision, resolution, accuracy and trueness of diffraction-based lattice strain measurements is discussed. The procedure consists of measuring the thermal expansion induced in each component of an ideal non-reacting two-component crystalline powder sample in situ. One component, with a high coefficient of thermal expansion (CTE), serves as an internal thermometer. The quantities of interest are obtained by determining the smallest statistically significant thermal lattice strain which can be detected through diffraction analysis in the second, low-CTE, component in response to controlled temperature changes. This procedure also provides a robust check of the alignment of the diffraction system and is able to reveal the presence of systematic errors. The application of this technique to a time-of-flight engineering diffractometer/strain scanner is presented.

Original language	English
Pages (from-to)	494-511
Number of pages	18
Journal	Journal of Applied Crystallography
Volume	53
DOIs	https://doi.org/10.1107/S1600576720002150
State	Published - Apr 1 2020

Funding

ICN acknowledges and thanks the Los Alamos and Oak Ridge National Laboratories for partially funding the two sabbaticals, during 2011–2012 at LANL and 2018–2019 at ORNL, respectively, when this work was performed. Additional sabbatical funding was provided by Columbia University. This work benefited from the use of the Lujan Neutron Scattering Center at LANSCE, which was funded by the Department of Energy (DOE), Office of Basic Energy Sciences. At the time Los Alamos National Laboratory was operated by Los Alamos National Security LLC under DOE contract DE-AC52-06NA25396. The analysis part of this research, at ORNL’s High Flux Isotope Reactor and the Spallation Neutron Source, was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy.

Funders	Funder number
ORNL’s High Flux Isotope Reactor
Office of Basic Energy Sciences
Scientific User Facilities Division
US Department of Energy
U.S. Department of Energy
Oak Ridge National Laboratory
Columbia University
Los Alamos National Laboratory	DE-AC52-06NA25396

Keywords

accuracy
precision
resolution
time of flight
trueness

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10.1107/S1600576720002150

Cite this

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abstract = "A simple statistical analysis which yields the precision, resolution, accuracy and trueness of diffraction-based lattice strain measurements is discussed. The procedure consists of measuring the thermal expansion induced in each component of an ideal non-reacting two-component crystalline powder sample in situ. One component, with a high coefficient of thermal expansion (CTE), serves as an internal thermometer. The quantities of interest are obtained by determining the smallest statistically significant thermal lattice strain which can be detected through diffraction analysis in the second, low-CTE, component in response to controlled temperature changes. This procedure also provides a robust check of the alignment of the diffraction system and is able to reveal the presence of systematic errors. The application of this technique to a time-of-flight engineering diffractometer/strain scanner is presented.",

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AU - Bunn, J. R.

AU - Tippett, M. K.

AU - Payzant, E. A.

AU - Clausen, B.

AU - Brown, D. W.

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AB - A simple statistical analysis which yields the precision, resolution, accuracy and trueness of diffraction-based lattice strain measurements is discussed. The procedure consists of measuring the thermal expansion induced in each component of an ideal non-reacting two-component crystalline powder sample in situ. One component, with a high coefficient of thermal expansion (CTE), serves as an internal thermometer. The quantities of interest are obtained by determining the smallest statistically significant thermal lattice strain which can be detected through diffraction analysis in the second, low-CTE, component in response to controlled temperature changes. This procedure also provides a robust check of the alignment of the diffraction system and is able to reveal the presence of systematic errors. The application of this technique to a time-of-flight engineering diffractometer/strain scanner is presented.

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Experimental determination of precision, resolution, accuracy and trueness of time-of-flight neutron diffraction strain measurements

Abstract

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Keywords

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