自由落体式绝对重力仪(A10型)测量关键技术与拉力调试方法

The Measurement Key Technology and Pull Adjustment Method of A10 Free-fall Absolute Gravimeter

绝对重力仪是目前用于获得重力加速度,并服务于国家重力基准网建设的主要技术力量。综合考虑野外流动绝对重力测量环境和条件要求,A10型绝对重力仪正成为FG5型绝对重力仪由室内扩展室外观测的重要帮手;为保证仪器正常运行且观测数据可靠,开展A10型绝对重力仪调试与维护关键技术研究十分必要。本文基于A10型绝对重力仪与CG5型相对重力仪在三峡库区七个测点的联测段差对比、数据处理过程中固体潮与高度改正、计量参数激光频率变化、新旧测时卡替换中参数设置变化等重要环节,探讨了A10型绝对重力仪野外观测效率、数据处理与仪器校准等关键问题,并且根据使用与测试经验,给出了由于使用年限增加而经常出现落体拉力的调试流程,以上技术总结能够对该仪器长期维护与准确测量等方面提供重要的保障。

The absolute gravimeter is the main technical support currently used to obtain gravity and serve the construction of national gravity reference network.Considering the environment and condition requirements of field mobile absolute gravity observation,A10 absolute gravimeter is becoming an important helper for FG5 absolute gravimeter to expand from indoor to outdoor observation.In order to ensure the proper operation of the gravimeter and the reliability of observation data,it is necessary to carry out the research on the key technology of A10 absolute gravimeter debugging and maintenance.This comparitive study fucuses on the segment difference between A10 absolute gravimeter and CG5 relative gravimeter at seven measuring points in the Three Gorges Reservoir Area,after applying the correction of solid tide and height in the process of data processing,varying laser frequency of gravimeter parameters and parameter setting in the replacement of old and new time measuring cards,and discussing such key points as the field observation efficiency,data processing and gravimeter calibration of A10 absolute gravimeter.Based on the application experience and test,this paper concludes the debugging process of falling motion in contrast to the service life,which provides an important guarantee for the long-term maintenance and accurate measurement of the gravimeter.