自振效应对平台式绝对重力仪影响的研究

绝对重力仪是用来精密测量重力加速度的仪器，在计量学、地球物理、地质勘探、辅助导航等诸多领域中有着广泛应用。目前分体式绝对重力仪的测量精度已达到微伽（μGal）量级，而平台式绝对重力仪受自身振动影响较大，精度通常只能达到毫伽（mGal）量级。基于NIM-3C型绝对重力仪搭建一套振动测量系统，分别对分体式及平台式NIM-3C的振动数据进行采集。通过对振动传递函数的分析找到降低自振的关键环节，取得阶段性研究成果。通过改进，有望将平台式绝对重力仪的测量精度提高到百微伽量级。

Study on the Influence of Free Vibration Effect on Platform Absolute Gravimeter

Absolute gravimeter is an instrument used to accurately measure the gravitational acceleration,and it has a wide range of applications in many fields such as metrology,geophysics,geological exploration,and navigation.At present,the measurement accuracy of the split-type classical absolute gravimeter has reached the μGal level.On the other hand,the platform-type absolute gravimeter is greatly affected by its free vibration,resulting in an accuracy of several milligal.A set of vibration measurement system was built based on the NIM-3C absolute gravimeter,and the vibration data of the split and platform NIM-3C were collected,respectively.Through the analysis of the vibration transfer function,the key link to reduce the natural vibration was found,and a phased study was obtained.It is expected that the measurement accuracy of the platform-type absolute gravimeter will be improved to be several hundreds of microgal with better vibration control method applied in the gravimeter.