基于冷原子重力仪的轨道移动绝对重力测量  

Movable measurement of absolute gravity on the rail based on cold atom gravimeter

作　　者：张旭 颜树华[1,2] 李期学 章欢开 王亚宁 杨俊[1,2] 朱凌晓 刘纪勋 ZHANG Xu;YAN Shuhua;LI Qixue;ZHANG huankai;WANG Yaning;YANG Jun;ZHU Lingxiao;LIU Jixun(College of Artificial Intelligence,National University of Defense Technology,Changsha 410073,China;Interdisciplinary Center for Quantum Information,National University of Defense Technology,Changsha 410073,China)

机构地区：[1]国防科技大学智能科学学院,湖南长沙410073 [2]国防科技大学量子信息学科交叉中心,湖南长沙410073

出　　处：《计测技术》2023年第4期128-134,共7页Metrology & Measurement Technology

基　　金：国家自然科学基金资助项目(12004428);湖南省自然科学基金优秀青年项目(2021JJ20047)。

摘　　要：绝对重力测量在铁路路基探测等领域发挥着重要作用,但大多数室外移动重力仪结构复杂或精度一般,可使用的范围有限。研制了一套轨道移动绝对重力测量系统,实现了高集成的系统结构设计、自动化的测试流程,开展了实验室及轨道环境下的绝对重力测量,测量结果可靠。首先,在实验室环境下重力测量灵敏度达到了440μGal⋅Hz^(-1/2),测量300 s的误差小于30μGal。其次,在炎热、嘈杂的室外轨道移动条件下,绝对重力测量不确定度优于15μGal,与相对重力仪(LG-1)的测量偏差优于40μGal。最后,轨道环境下的重力测量灵敏度达到707.9μGal⋅Hz^(-1/2)。所提出的轨道移动绝对重力测量系统可以在室外条件下进行快速重力测量,为铁路路基探测提供了新的仪器与解决方案。Absolute gravity measurement plays an important role in the field of railway subgrade detection,but most mobile gravimeters have complex structures or mediocre accuracy,and their application range is limited.In this paper,we integrate a system of movable absolute gravity measurement on the rail,which realizes highly integrated system structure design and automatic test process,and undertake experiments of absolute gravity measurement in the laboratory and on the rail.Firstly,in the laboratory,the longerm gravity measurement sensitivity is 440μGal⋅Hz^(-1/2) and the measurement accuracy is 30μGal in the integration time of 300 s.Secondly,on the outdoor rail,the uncertainty of movable gravity measurement is less than 15μGal,and the measurement deviation with the relative gravimeter(LG-1)is less than 40μGal.Lastly,the gravity measurement sensitivity on the rail is about 707.9μGal⋅Hz^(-1/2).Therefore,our system can realize fast gravity measurement under outdoor conditions and provide new instrument and solution for detection of railway subgrade.

关 键 词：冷原子重力仪 铁路探测 可移动 绝对重力测量 

分 类 号：TB939[一般工业技术—计量学] TH762[机械工程—测试计量技术及仪器]