固定角度平面镜标定方法与不确定度分析

Calibration method and uncertainty analysis of fixed angle mirror

在北京同步辐射装置新建4B7B束线没有安装反射率计,且用户空间有限的情况下,利用X光基准点还原的方法建立了一种Dante谱仪固定角度平面镜反射率标定方法。利用三光束瞄准方法完成了束线软X光基准重建,通过准直方法实现了平面镜与X光之间的高定角精度,并采取了相应的角度姿态监测,最终在实验中得到的平面镜标定角不确定度为1.0 mrad。基于固定角度平面镜多次安装和朝各个方向转动后的标定结果,获得了高精度的反射率曲线。

A Dante spectrometer mirror calibration method is developed by recovery of X-ray benchmarks without installing reflectivity meter chamber and limit space in 4BTB beamline of BSRF. X-ray benchmark line is achieved by three heamlines aiming. High angle precision is realized by collimation, and chamber state surveillant system was adopted. Mirror calibration uncertainty of angle is 1.0 mrad for the experiment. High precise reflectivity curves have been acquired by repeat installation and in four direc- tions of fixed angle mirror.