KSS31海洋重力仪的长期零点漂移特征

Long Term Zero Drift Characteristics of KSS31 Marine Gravimeter

通过对两套德国生产的KSS31海洋重力仪十多年来的零点漂移变化观测数据的整理,分析了长期以来零点漂移特征及其影响因素。本文认为缓慢的正向漂移是海洋重力仪零点漂移之总体趋势,其中会出现一些正负的波动,而大的零点漂移波动往往对应着设备状态出现的大变化。建议在海洋重力仪的搬运、重新安装之后需加强监测;重力仪的恒温系统需长期保持工作状态;最后认为长期对海洋重力仪的零点漂移保持跟踪,对于海洋重力仪的维护、使用以及测量资料的精度保证十分必要。

The zero drift of marine gravimeter is an important technical indicator during the process of gravity measurement.It can not only reflect the equipment＇s working condition, but also is the critical basis of the control of marine gravity data quality.By organizing the observed data of zero drift observe changes from the two German KSS31 marine gravimeters for over ten years, this article analyses the zero drift＇ s long term characteristics and its influencing factors. The overall trend of the marine gravimeter＇ s zero drift is the slow forward drift, with some positive and negative fluctuation. However, the large fluctuation of the zero drift is closely related to the greater change of the equipment＇ s working condition.Enhancing detection is indispensable after transporting and reinstalling the marine gravirneter. Besides, the gravimeter＇ s thermostat system should remain active for along time.Lastly, the long term zero drift tracking of marine gravimeter is of great necessity in maintaining and using the marine gravimeter as well as ensuring the accuracy of measurement data.