绝对重力仪落体光心质心距调校方法研究

doi:10.3969/j.issn.1000-1158.2024.02.13

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摘要为了最小化激光干涉式绝对重力仪中落体旋转引入的重力加速度测量误差,提出了一种基于落体悬吊的光心质心间距调校方法,结合落体的外部结构,搭建了一套简易高效的落体调校装置。该装置采用光电自准直仪测量落体悬吊状态下的俯仰角,可实现对落体质心位置的高准确度调节,进而完成对落体光心质心距的调校。对装置的测量不确定度进行了评估,得到落体光心质心距测量的合成标准不确定度为18.85μm。最后在NIM-3A型绝对重力仪上进行实验验证。结果表明,悬吊法调校落体的光心质心距优于20μm。若落体旋转角速度控制在0.02rad/s以内,则落体引入的重力加速度的误差优于1μGal。

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	范锋
	杨佩玺
	王启宇
	冯金扬
	要佳敏
	胡若
	吴书清

关键词 ：重力加速度, 绝对重力仪, 光心质心距, 落体, 悬吊法

Abstract：To minimize measurement error of gravity acceleration induced falling body rotation in absolute gravimeter based on laser interferometry, a method for adjusting the distance between center of mass(COM) and the optical center(OC) based on falling body suspension was proposed. Combined with the external structure of falling body, a simple and efficient falling body adjusting device was built. The device adopted photoelectric autocollimator to measure the pitch angle of the falling body in suspension state, which can adjust the position of COM of falling body, and then completed the adjustment of the distance between COM and OC. The uncertainty of the systematic measurement was also evaluated, and the synthetic standard uncertainty of the distance measurement was 18.85μm. Finally, the falling bodies adjusted by suspension method was put into the NIM-3A absolute gravimeter for experimental. The results show that the distance between COM and OC is better than 20μm, which is in line with the estimated uncertainty results. If the angular velocity of the falling body is controlled within 0.02rad/s, the measurement uncertainty of the gravitational acceleration introduced by the falling body rotation is better than 1μGal.

Key words： gravity acceleration absolute gravimeter distance between center of mass and optical center falling body;suspension method

收稿日期: 2022-08-22 发布日期: 2024-02-21

PACS:

TB932

基金资助:中国计量科学研究院基本科研业务费重点领域项目(AKYZD2002-3)

通讯作者: 王启宇(1989-), 男, 山东枣庄人,中国计量科学研究院副研究员, 博士, 主要从事重力计量及重力精密测量方面的研究。Email: wangqiyu@nim.ac.cn E-mail: wangqiyu@nim.ac.cn

作者简介: 范锋(1978-), 男, 河北广宗人,河北工程大学副教授, 硕士生导师,主要从事机器视觉、光学工程方面的研究。Email: fanfeng@hebeu.edu.cn

引用本文:

范锋,杨佩玺,王启宇,冯金扬,要佳敏,胡若,吴书清. 绝对重力仪落体光心质心距调校方法研究[J]. 计量学报, 2024, 45(2): 231-237.
FAN Feng,YANG Peixi,WANG Qiyu,FENG Jinyang,YAO Jiamin,HU Ruo,WU Shuqing. Research on Adjustment Method of Distance Between Center of Mass and Optical Center of Falling Body in Absolute Gravimeter. Acta Metrologica Sinica, 2024, 45(2): 231-237.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2024.02.13 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2024/V45/I2/231

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