【作者】 吴琼； 滕云田； 黄大伦； 张兵； 郭有光；

【Author】 Wu Qiong;Teng Yun-tian;Huang Da-lun;Zhang Bin;Guo You-guan;Institute of Geophysics,China Earthquake Administration;

【机构】 中国地震局地球物理研究所；

【摘要】 光速有限性误差是激光干涉绝对重力仪不能被直接测量的系统误差,不同的测量光路对应不同的误差值,而在进行绝对重力仪仪器比对时又必须进行修正。本文详细分析了激光干涉原理绝对重力仪器的测量光路,从时间延迟、多普勒效应两个角度切入,提出光速有限性误差的修正算法并进行模拟计算。结果表明上抛法激光干涉绝对重力仪不需要光速有限性修正,下落法绝对重力仪需要根据自身测量光路的光程,进行修正值计算。最后基于本文提出的算法,对自主研发的Age-105型激光干涉绝对重力仪进行光速有限性误差计算并修正2017年9月30日¹0月10日在丽江地震台长期测试结果,与同台同期工作FG5型绝对重力仪测量结果对比,二者测量结果的偏差缩小到3.1×10^-8m/s²,从而确定了本文所提出的光速有限性误差计算公式的准确性。更多还原

【Abstract】 The speed-of-light perturbation is one of the systematic errors in interference absolute gravimeter,which is different from measuring optical routs,can not be investigated independently and must be corrected in the measurement results finally submitted during the international absolute gravity comparison.In this paper,the measurement optical path of laser interferometry absolute gravimeter is analyzed in detail.From the retarded times and Doppler Effect,the correction algorithm for the speed-of-light perturbation is proposed and simulated.The results show that the absolute gravimeters measured with direct free fall method need to compute this kind of correction according to its measurement optical path and not need in absolute gravimeter measured with ballistic methods.Finally,based on the algorithm proposed in this paper,the speed-of-light perturbation of the independently developed Age-105 laser interferometric absolute gravimeter is calculated and used to correct the long-term test results at Lijiang Seismic Station from September 30 to October 10,2017.Compared with the FG5 absolute gravimeter measured during the same period,the deviation between the measured results is reduced to 3.1×10^-8m/s²,so the accuracy of the formula for the speed of light proposed in this paper is confirmed.更多还原