对Burris型相对重力仪长时间断电后再次供电，分析Burris型重力仪升温过程，并使用2台Burris型重力仪（B95和B101） 2014年7月至2016年12月的实测数据，分析仪器性能。结果表明：① Burris型相对重力仪长时间断电并再次供电后，加热125 min达到恒温点，在升温过程中，读数先大幅减小后小幅增大，绝对变化率逐渐减小，通电110 h后零漂小于3×10-8 m/（s2·h），达地震重力观测仪器进网要求；② Burris型重力仪静态零漂存在由负变正的过程，不同仪器所需时间不同；③随着仪器使用年限加长，Burris型重力仪稳定性变差。忽略重力仪突跳读数，可获取测量精度在10×10-8 m/s2左右的流动重力数据；④ Burris型重力仪混合零漂和静态零漂变化基本一致，呈逐渐增大趋势，但存在差别。
We studied the property of Burris gravimeter, based on the observed data of Burris B95 and B101 during April 2014 and December 2016. After one month cooled, the test of heating process for B95 shows that the gravimeter reaches constant temperature after 125 minutes and zero drift rate of the gravimeter is larger than 5×10-8 m·s-2/h after 65 hours from power up. In the heating process, the reading of the gravimeter greatly drops and then increases in a small range, but the absolute rate of change gradually decreases. Static measurement data of B95 and B101 indicate that the zero drift rate increased to about 23×10-8 m·s-2/day from about -90×10-8 m·s-2/day which was gotten by the data when the meters were deployed. And we found that the zero drift rate of B95 exist obviously change process from negative drift rate to positive one after the meter has been used to measure mobile gravity for eight months, while the zero drift rate of B101 quickly changed into positive from negative after the meter was deployed. The measurement data in gravity baseline field in Xi'an shows that the stability of Burris gravity meter may deteriorate as the time in service extends. For Burris B95, the data in March 2016 and July 2015 had several jumps, while the data in July 2014 and January 2015 did not jump at the same sites. However, the data of Burris B101 was not having any jumps. Based on the data from B101 and from B95 without jumps, the standard deviation of the data in baseline field is about 10×10-8 m·s-2, which indicates that Burris gravimeter can be used in the mobile gravity survey with the precision of 10×10-8 m·s-2. The compositive drift rates of B95 and B101 were gotten by the measure data at the same sites and different times. The result of calculation shows that the variation tendency of compositive drift rate increases with operation time, which is in accordance with static zero drift, but the current compositive drift rate is different from the current static drift rate.
2018,39(2): 178-185 收稿日期：2017-05-10
DOI：10.3969/j.issn.1003-3246.2018.02.026
基金项目：国家自然科学基金（项目编号：41374026，41274083）
作者简介：赵云峰(1983-),男,工程师,主要从事地震重力监测及地球动力学研究工作
参考文献：
付广裕, 祝意青, 高尚华, 等. 川西地区实测自由空气重力异常与 EGM2008 模型结果的差异[J]. 地球物理学报, 2013, 5(6 11):39.
何志堂, 陈惠军, 任秀波, 等. Burris70、Burris73 相对重力仪性能试验[J]. 测绘技术装备, 2012, 14 (3):60-61.
何志堂, 唐志明, 贺小明, 等. Burris 型与 LCR-G 型重力仪静态观测比较分析[J]. 测绘技术装备, 2012, 14(1):55-58.
李青. LCR-G 型重力仪长期动态漂移特性的初步研究[J]. 华北地震科学, 2000, 18(4):26-35.
梁伟锋, 刘芳, 徐云马, 等. 青藏高原东缘重力观测及对芦山 M 7.0 地震的反映[J]. 地震工程学报, 2013, 35 (2):251-257.
沈晶, 刘端法, 陈递波. Lacoste-Romberg G 型重力仪的漂移探讨[J]. 地震地磁观测与研究, 1992, 13(2):67-73.
王谦身, 安玉林, 张赤军, 等. 重力学[M]. 北京:地震出版社, 2003.
王西文. 用重力、地震资料联合反演直接预测油气藏的方法[J]. 石油地球物理勘探, 1997, 32 (2):221-228.
余剑和. 对拉科斯特重力仪稳定状态的分析[J]. 内陆地震, 1999,(1):88-92.
张锐, 何志堂, 郭树松, 等. Burris 重力仪性能测试[J]. 大地测量与地球动力学, 2011, 31 (6):155-158.
中国地震局. 地震观测仪器进网技术要求:重力仪 (DB/T 23-2007)[S]. 北京:中国标准出版社, 2007.
周江存, 徐建桥, 孙和平. 中国大陆精密重力潮汐改正模型[C]//中国测绘学会第九次全国会员代表大会暨学会成立 50 周年纪念大会, 北京, 2009.
Zhu Yiqing, Zhan F. Benjamin, Zhou Jiangcun, Liang Weifeng, et al. Gravity measurements and their variations before the 2008 Wenchuan earthquake[J]. Bull Seismol Soc Am, 2010, 100(5B):2 815-2 824.
