Impediments to Efficient Through-Surface Strain Scanning
Impediments to Efficient Through-Surface Strain Scanning
复制标题
高效全表面应变扫描的障碍
DOI：
10.1080/10238169608200197
复制
发表时间：
1996
影响因子：
1.1
通讯作者：
T. Holden
中科院分区：
文献类型：
--
作者：
P. J. Webster;G. Mills;X. Wang;W. P. Kang;T. Holden
利用多探测器中子应变扫描仪有效地测量穿透表面的残余应变受到仪器效应的限制，这种效应是在“计量体积”仅部分浸入样品中时产生的。的三个主要原因，波长变化的入射光束，横向位移的“有效中心”的计量体积相对于检测器，和非对称剪切的衍射峰轮廓进行了讨论和量化。本文描述了对影响L-3光谱仪在加拿大乔克河AECL NRU反应堆应变扫描模式下工作的仪器畸变进行系统定量研究的结果。与理论模型，准确地预测所观察到的像差的比较。讨论了减少和纠正这些影响的技术。
Abstract The efficient measurement of through-surface residual strains using multidetector neutron strain scanners is constrained by instrumental effects which arise when the ‘gauge volume’ is only partly immersed in the sample. The three principal causes, wavelength variation across the incident beam, lateral displacement of the ‘effective centre’ of the gauge volume relative to the detector, and asymmetric clipping of the diffracted peak profile are discussed and quantified. Results are described of a systematic quantitative investigation of the instrumental aberrations that affect the L-3 spectrometer operating in its strain scanning mode at the NRU reactor at AECL, Chalk River, Canada. Comparisons are made with theoretical models which accurately predict the observed aberrations. Techniques for reducing and correcting for the effects are discussed.