材料与构件深部应力场及缺陷无损探测中子谱仪径向准直器的设计

为设计材料与构件深部应力场及缺陷无损探测中子谱仪的径向准直器，实现大型工程构件的远距离准确取样，本文分析了径向准直器的实空间和相空间取样原理，介绍了目前径向准直器取样体积的解析与模拟计算方法，并利用0.2 mm尼龙线测试了德国E3残余应力谱仪径向准直器的取样尺寸，基于实验结果确定了采用JRR3解析方法作为径向准直器取样尺寸的计算依据。根据解析计算结果，研究了设计参数对径向准直器取样尺寸和传输效率的影响规律，并按照谱仪的空间几何结构，最终设计了谱仪1、2、3、4、5 mm径向准直器取样系统。

Design of Radial Collimator of Neutron Diffractometer for Residual Stress and Defect in Material and Component

The gauge principle of the radial collimator in real space and phase space was analyzed to design the radial collimator of the neutron diffractometer for residual stress and defect in material and component in order to set the gauge volume in large engineering component at far distance. The analytical formulas and simulations were introduced to calculate the gauge volume of the radial collimator. The nylon wire with diameter of 0.2 mm was used to test the gauge volume of the radial collimator at E3 instrument, Germany. According to the experimental result, the JRR3 analytical formula was chosen to design the gauge volume of the radial collimator. The effect of the parameters on gauge volume and transmission efficiency was studied systematically. Finally, the radial collimators with gauge volume were designed in combination of the spatial geometrical layout with the parameters of 1, 2, 3, 4 and 5 mm.