Time-of-flight neutron imaging for spatially resolved strain investigations based on Bragg edge transmission at a reactor source

被引:28
|
作者
Strobl, M. [1 ]
Woracek, R. [1 ,2 ]
Kardjilov, N. [1 ]
Hilger, A. [1 ]
Wimpory, R. [1 ]
Tremsin, A. [3 ]
Wilpert, T. [1 ]
Schulz, C. [1 ]
Manke, I. [1 ]
Penumadu, D. [2 ]
机构
[1] Helmholtz Zentrum Berlin, D-14109 Berlin, Germany
[2] Univ Tennessee, Knoxville, TN 37996 USA
[3] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
来源
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2012年 / 680卷
关键词
Energy resolved neutron imaging; TOF neutron imaging; Bragg diffraction; Stress and strain; TOMOGRAPHY INSTRUMENT; ELASTIC-ANISOTROPY; STAINLESS-STEEL; STRESS STATES; DIFFRACTION; RESOLUTION; RADIOGRAPHY; EVOLUTION; DETECTOR;
D O I
10.1016/j.nima.2012.04.026
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Energy dependent neutron transmission imaging has recently gained attention for the potential to spatially resolve texture, crystallographic phase and lattice strain. Especially promising is the time-of-flight (TOF) approach that takes maximum advantage of the new generation of pulsed spallation neutron sources, such as SNS, JSNS and ESS. In this paper, the authors demonstrate the feasibility to efficiently apply the TOF approach at a continuous source in order to spatially resolve and quantify the (lattice) strain distribution in a flat steel sample under tensile loading. Although transmission-based TOF imaging for strain mapping at a pulsed source is well published, this work is the first attempt to demonstrate such measurement using choppers at a continuous neutron source. A critical component for spatially resolved TOF imaging is the availability of a high spatial resolution imaging detector, capable of the required time resolution. For the herein presented work, a conventional 2D position-sensitive He-3 detector with a spatial resolution of 2 x 3 mm(2) has been used for proof-of-principle measurements. The results are compared to conventional lattice strain measurements obtained at an engineering neutron diffractometer, where the same mechanical loading system was utilized. The efficiency of the time-of-flight transmission method is discussed with respect to other methods, at continuous as well as at pulsed sources. (C) 2012 Elsevier B.V. All rights reserved.
引用
收藏
页码:27 / 34
页数:8
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