Abstract
为进一步提高真空量值的复现性和准确性, 最新研究采用量子技术实现对真空量值的测量与表征. 该方法利用Fabry-Perot谐振腔实现腔内气体折射率的精密测量, 并反演出气体密度, 进而获得对应的真空量值, 其中气体折射率的测量是影响真空量值准确性的关键. 本文基于第一性原理, 利用从头计算理论计算了在已知压力和温度条件下的氦气折射率, 给出腔内气体压力与折射率关系的表达式, 并利用基于Fabry-Perot激光谐振腔的真空测量装置, 通过双腔谐振激光拍频精确测量了充气前后谐振激光频率的变化, 测出了氦气折射率, 并分析了测量不确定度. 将理论计算值与实验测量值进行了对比分析, 得出了制约准确度提高的主要因素, 并提出了修正方法.
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