超小型绝对重力仪主机系统设计

Design of Host System for Miniature Absolute Gravimeter

为了解决NIM-3A和NIM-3C绝对重力仪传动方式在车载、共基座上使用时会产生自振及磁性材料对重力数据准确度和稳定性影响的问题,设计了一套超小型绝对重力仪主机系统,通过传动托盘的伺服跟踪运动改为托盘先行下落的落体测量过程无其他内部机械运动的测量方式等新设计,消除自振及磁性材料的影响。在主机系统重质量减小至30 kg的情况下,测量速度较NIM-3A绝对重力仪的3次/min提高到6次/min,预估测量不确定度由NIM-3C重力仪的30μGal提高到10μGal。

To solve the problem that the operation mode of the drive tray of NIM-3A and NIM-3C absolute gravimeters arise self-vibration and the influence of magnetic materials on the accuracy and stability of gravity measurement when they are used on vehicle or common base,a miniature absolute gravimeter host system is designed.The influence of self-vibration and magnetic materials was avoided by changing the previous servo tracking motion of the driving tray to a novel tray driving mode that measures the falling body with no other internal mechanical motion due to the first falling of the tray.In the situation of reducing the weight of the host system to 30 kg,the measurement speed can be increased from 3 times/min for NIM-3A to 6 times/min,and the estimated measurement uncertainty decreased from 30μGal in the previous NIM-3C gravimeter to 10μGal.