Vibration Measurement Technique of Reference Prism in Free-Falling Absolute Gravimeter
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 de-vice 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 vi-bration 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 vibra-tion 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.
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