关键词: 绝对重力仪, 参考棱镜, 减振技术, 振动测量

Abstract: Accurately measuring the vibration signal of the absolute gravimeter reference prism and using it to compensate for the absolute gravity measurement is one solution to improve the measurement accuracy of the absolute gravimeter. In this regard, this article introduces the principle of reference prism vibration measurement, designs a reference prism vibration acceleration measurement device, and derives the transfer function of the reference prism vibration measurement device. The result shows that the measurement device can be equivalent to an accelerometer. Through mature accelerometer measurement methods, equivalent accelerometer transfer function parameters can be obtained, thereby obtaining the transfer function of the output voltage of the measurement device to the vibration acceleration of the reference prism. The vibration acceleration of the reference prism can be solved to compensate for absolute gravity measurement. On the basis that the data measured in the laboratory are consistent with the theoretical data, through the vibration experiment of the vertical vibrating pendulum at the National Earth Observatory in Beijing, it is found that the experimental curve coincides with the amplitude-frequency characteristic curve described by the theoretical model formula, verifying the reliability of the reference prism vibration measurement in actual use.

Key words: Absolute gravimeters, Reference corner cube, Vibration reduction technique, Vibration measurement