计量学报2024，Vol.45Issue(2)：231-237,7.DOI:10.3969/j.issn.1000-1158.2024.02.13
绝对重力仪落体光心质心距调校方法研究
Research on Adjustment Method of Distance Between Center of Mass and Optical Center of Falling Body in Absolute Gravimeter
摘要
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 18.85 μm.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 20 μm,which is in line with the estimated uncertainty results.If the angular velocity of the falling body is controlled within 0.02 rad/s,the measurement uncertainty of the gravitational acceleration introduced by the falling body rotation is better than 1 μGal.关键词
重力加速度/绝对重力仪/光心质心距/落体/悬吊法Key words
gravity acceleration/absolute gravimeter/distance between center of mass and optical center/falling body/suspension method分类
通用工业技术引用本文复制引用
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):231-237,7.基金项目
中国计量科学研究院基本科研业务费重点领域项目(AKYZD2002-3) （AKYZD2002-3）
