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Abstract

Dynamic gravity measurements can improve the survey efficiency of the gravity field, and can play an important role in implementing the basic geological surveys, resource exploration, and geophysical research. Based on cold atom gravimeter, inertial stabilization platform and the movable vehicle device, a system for dynamically measuring absolute gravity is built, and the dynamic measurement experiments are carried out. Firstly, the noise power spectra of the vertical vibration are measured at different moving velocities, and the influence of such a vibration on the measurement of absolute gravity is analyzed theoretically. Besides, the influence on the contrasts and offsets of the atomic interference fringes are evaluated from different moving velocities, then the effect of vibration compensation in the dynamic measurement environment is analyzed. When the maximum moving speed is 5.50 cm/s and the maximum vibration amplitude is 0.1 m/s ², the atomic interference fringes can still be rebuilt based on the technology of vibration compensation. On this basis, the atomic interference fringes are obtained at different values of Tand different moving velocities, then the absolute gravity value in the dynamic measurement environment is evaluated. After the correction of the systematic system and subtraction by the initial value of absolute gravity, the final measured result is (–1.22 ± 2.42) mGal. Finally, the experiment on the static absolute gravity is conducted, and the two values are found to be not much different from each other through comparing the static measurement data with the dynamic measurement data. The experiment of dynamic absolute gravity measurement in this paper may provide the helpful reference data for the dynamic absolute gravity measurement with moving vehicles.

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Authors and contacts

Corresponding author:Wu Bin,wubin@zjut.edu.cn; Lin Qiang,qlin@zjut.edu.cn

Funds:Project supported by the National Key Research and Development Program of China (Grant No. 2017YFC0601602), the National Natural Science Foundation of China (Grant Nos. 51905482, 61727821, 61875175, 11704334), and the China Aero Geophysical Survey and Remote Sensing Center for Natural Resources Program, China (Grant No. DD20189831).

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DownLoad: Full-Size Img PowerPoint

Moving velocity/(cm·s^–1)	0.55	1.35	2.25	3.75
$ \Delta g $/mGal	0.0006	0.0024	0.0250	0.0400

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时间/h	重力均值/mGal
1.0	–2.26
1.5	–2.27
2.0	–2.31
2.5	–2.22
3.0	–2.35
3.5	–2.33

DownLoad: CSV

项目	修正量/μGal	不确定度/μGal
科里奥利力	–3.0	0.2
双光子光移效应	–43.2	4.0
重力梯度	–9.0	0.1
激光波长	–5.5	1.1
参考频率	0.0	2.0
射频相移	0.0	2.0
自引力效应	–2.7	0.1
其他修正量	0.0	4.0
合成结果	–63.4	13.5

DownLoad: CSV

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Vol. 71, Issue 2 - 2022-01-20

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