Method and device for compensating horizontal acceleration motion error of movable atomic interferometer gravimeter

By obtaining the relative position change and characterization information of the cold atomic cluster in the Raman light pulse sequence and adjusting the Raman light parameters in real time, the problem of decreased measurement accuracy of the movable atom interferometer gravimeter during horizontal acceleration motion was solved, and accurate gravity measurement was achieved.

CN115542411BActive Publication Date: 2025-09-05NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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Patent Information

Application Number
CN202211213435.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-09-29
Publication Date
2025-09-05
Estimated Expiration
2042-09-29

AI Technical Summary

Technical Problem

During the horizontal acceleration motion of the carrier of the movable atomic interferometer gravimeter, the measurement accuracy is affected by the relative position change and wavefront phase shift, which is difficult to compensate effectively with existing technologies, resulting in a decrease in measurement accuracy.

Method used

By obtaining the relative position change information of the cold atomic cluster in the horizontal cross-section of the Raman light pulse sequence, combined with the characterization information such as the intensity distribution, wavefront distribution and initial density distribution of the Raman light, the intensity or pulse width of the Raman light pulse is adjusted in real time to compensate for the effective Rabi frequency and wavefront phase shift, correct the gravitational phase shift, and improve the measurement accuracy.

Benefits of technology

Real-time compensation of errors caused by horizontal acceleration motion is achieved, the decrease in fringe contrast is suppressed, and the measurement accuracy of the atomic interferometer gravimeter is improved.

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Abstract

The present invention provides a method and device for compensating for horizontal acceleration errors in a mobile atomic interferometer gravimeter. Within a single measurement cycle, the method obtains the gravitational phase shift based on the interference loop formed by the interaction between a Raman light pulse sequence and a cold atomic cluster. The method also obtains information on the relative position change of the cold atomic cluster within the horizontal cross-section of the Raman light pulse sequence. Based on this relative position information and pre-acquired characterization information, the method obtains the effective Rabi frequency under the action of horizontal acceleration. The effective Rabi frequency is then compensated to reduce the impact of horizontal acceleration on the atomic interferometer gravity measurement process. Based on the relative position change information and the characterization information, the method obtains the wavefront phase shift introduced by the horizontal acceleration. Based on the wavefront phase shift and the gravitational phase shift, the method obtains a corrected gravitational phase shift. The method then obtains the single-cycle gravitational acceleration based on the corrected gravitational phase shift. This method improves the measurement accuracy of the atomic interferometer gravimeter.
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