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针对仪器几何结构和像素灵敏度效应校准小角中子散射（SANS）数据：扩展范围的获取

Calibrating SANS data for instrument geometry and pixel sensitivity effects: access to an extended range.

作者信息

Karge Lukas, Gilles Ralph, Busch Sebastian

机构信息

Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Lichtenbergstrasse 1, 85747 Garching bei München, Germany.

German Engineering Materials Science Centre (GEMS) at Heinz Maier-Leibnitz Zentrum (MLZ), Helmholtz-Zentrum Geesthacht, Lichtenbergstrasse 1, 85747 Garching bei München, Germany.

出版信息

J Appl Crystallogr. 2017 Sep 14;50(Pt 5):1382-1394. doi: 10.1107/S1600576717011463. eCollection 2017 Oct 1.

DOI:10.1107/S1600576717011463
PMID:29021734
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5627681/
Abstract

An improved data-reduction procedure is proposed and demonstrated for small-angle neutron scattering (SANS) measurements. Its main feature is the correction of geometry- and wavelength-dependent intensity variations on the detector in a separate step from the different pixel sensitivities: the geometric and wavelength effects can be corrected analytically, while pixel sensitivities have to be calibrated to a reference measurement. The geometric effects are treated for position-sensitive He proportional counter tubes, where they are anisotropic owing to the cylindrical geometry of the gas tubes. For the calibration of pixel sensitivities, a procedure is developed that is valid for isotropic and anisotropic signals. The proposed procedure can save a significant amount of beamtime which has hitherto been used for calibration measurements.

摘要

本文提出并展示了一种用于小角中子散射（SANS）测量的改进数据约简程序。其主要特点是在与不同像素灵敏度分开的步骤中校正探测器上与几何形状和波长相关的强度变化：几何和波长效应可以通过解析方法校正，而像素灵敏度必须通过参考测量进行校准。对于位置灵敏的氦正比计数管，处理了几何效应，由于气体管的圆柱形几何形状，这些效应是各向异性的。对于像素灵敏度的校准，开发了一种对各向同性和各向异性信号均有效的程序。所提出的程序可以节省大量迄今为止用于校准测量的束流时间。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bc1a/5627681/8e7730b806c7/j-50-01382-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/bc1a/5627681/f0a31cb875ed/j-50-01382-fig11.jpg
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