绝对重力仪落体光心与质心空间距离测量

doi:10.3969/j.issn.1000-1158.2023.01.02

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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0.3~0.5Hz时的测量精度为0.1nm,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。

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	吕康
	余烨
	黄安贻
	田钰
	冯金扬
	王若琳
	叶子薇

关键词 ：计量学, 绝对重力仪, 落体, 扭摆法, 光程

Abstract：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 0.3~0.5Hz is 0.1nm. The improved calculation method can make the measurement system′s class A uncertainty better than 10μm and maximum measurement error in adjustment is 1μm.

Key words： metrology absolute gravimeters falling body torsional pendulum method;optical path

收稿日期: 2021-11-01 发布日期: 2023-01-13

PACS:

TB932

基金资助:国家重点研发计划(2018YFF0212401)

通讯作者: 黄安贻(1965-),湖北钟祥人,武汉理工大学机电工程学院教授,主要从事智能仪器与虚拟仪器方面研究。Email:67973791@qq.com E-mail: WHUTLK2021@163.COM

作者简介: 吕康(1997-),湖北孝感人,武汉理工大学研究生,主要研究方向为重力测量及精密仪器。Email:WHUTLK2021@163.com

引用本文:

吕康,余烨,黄安贻,田钰,冯金扬,王若琳,叶子薇. 绝对重力仪落体光心与质心空间距离测量[J]. 计量学报, 2023, 44(1): 6-11.
Lü Kang,YU Ye,HUANG An-yi,Tian Yu,FENG Jin-yang,WANG Ruo-lin,YE Zi-wei. Measurement of Spatial Distance between Falling Body′s Optical Center and Mass center for Absolute Gravimeters. Acta Metrologica Sinica, 2023, 44(1): 6-11.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2023.01.02 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2023/V44/I1/6

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