为了减少用光学干涉法测量绝对重力过程中落体旋转对测量结果的影响,设计了基于扭摆法调校落体光心与质心间距的方法。采用标准模态分析落体的本征频率,推导光心与质心沿铅锤线方向偏移的测量方程。并分析了角锥棱镜折射率与气体阻尼分别对测量结果的影响。结果表明:入射角在0~0.1°之间,品质因子Q=1000时,调校落体使光心与质心重合,旋转导致的重力加速度干扰最佳可控制在1.4μGal。
Abstract
To reduce the influence of falling body rotation on the measurement result for absolute gravity measurement based on optical interferometry,a novel method used to collocate the falling bodys center of mass(Ocm) with its optical center by torsion pendulum was proposed. Analyzing the eigenfrequency of falling body by standard mode,the measurement equation of the center of optical and the center of mass deviation along the plumb line was deduced. In addition,analyzing the influence of the corner-cube retroreflectors refractive index and the gas damping for the measured results,respectively. Numerical analysis shows that when the incidence angle is between 0 and 0.1 degree, and the quality factor Q=1000, the disturbance of gravity acceleration caused by rotation can be optimal controlled at the level of 1.4μGal.
关键词
计量学 /
绝对重力仪 /
落体旋转 /
扭摆法 /
光程
Key words
metrology /
absolute gravimeters /
rotation of falling body /
torsional pendulum method /
optical path
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基金
国家重点研发计划重点专项(2018YFF0212400); 中国计量科学研究院基本科研业务费专项(AKY1608)
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