摘要
为了准确测量重力仪落体光心与质心距离,减少落体光心与质心不重合引起的旋转对重力加速度测量的影响,设计了落体光心与质心空间距离测量装置。提出了1种光心与质心间距的计算方法,并仿真验证了计算方法的可行性。使用设计的测量装置对落体进行测试,结果表明:激光干涉仪在信号频率为0.3~0.5 Hz时的测量精度为0.1 nm,提出的计算方法可以使测量系统的A类不确定度优于10μm,最大调校测量误差为1μm。
In order to accurately measure the distance between the center of mass and the optical center of the falling body of the gravimeter,and to reduce the influence of the rotation caused by the non-coincidence of the center of light and the center of mass on the measurement of the acceleration of gravity,a set of spatial distance measurement device for the falling body′s mass center and optical center was built.The calculation method of the distance between the optical center and the center of mass was proposed,and the feasibility of the scheme was verified through simulation.Test the falling body with the measuring device and numerical analysis shows that the measurement accuracy of the laser interferometer at the signal frequency of 0.3~0.5 Hz is 0.1 nm.The improved calculation method can make the measurement system′s class A uncertainty better than 10μm and maximum measurement error in adjustment is 1μm.
作者
吕康
余烨
黄安贻
田钰
冯金扬
王若琳
叶子薇
LÜ Kang;YU Ye;HUANG An-yi;Tian Yu;FENG Jin-yang;WANG Ruo-lin;YE Zi-wei(Wuhan University of Technology,Wuhan,Hubei 430070,China;Hubei Instiute of Measurement and Testing,Wuhan,Hubei 430223,China;National Institute of Metrology,Beijing 100029,China)
出处
《计量学报》
CSCD
北大核心
2023年第1期6-11,共6页
Acta Metrologica Sinica
基金
国家重点研发计划(2018YFF0212401)。
关键词
计量学
绝对重力仪
落体
扭摆法
光程
metrology
absolute gravimeters
falling body
torsional pendulum method
optical path
