研究目的
To evaluate the performances of the first unit of the Absolute Quantum Gravimeter (AQG) in terms of sensitivity, stability, and repeatability of the measurements.
研究成果
The first unit of the AQG has demonstrated high sensitivity, stability, and repeatability in various environments, validating its operation as a mobile and turnkey device capable of continuous measurement with a statistical uncertainty on the measurement of g at a level of 1 μGal.
研究不足
The accuracy of the AQG, in terms of the error budget, is in the order of several μGal, and the metrological evaluation of the systematic effects is currently being performed. Thus, it is too early to commit to a particular value for accuracy.
1：Experimental Design and Method Selection:
The AQG measures the acceleration of a free-falling test mass in vacuum using laser-cooled atoms and a vertical reference laser beam. The methodology includes the use of a specific opto-mechanical configuration, fiber optics components, and an auxiliary classical accelerometer for vibration noise rejection.
2：Sample Selection and Data Sources:
The first unit of the AQG (AQG#A01) was evaluated in various environments, including a city center and the H+ Observatory operated by Geoscience Montpellier.
3：List of Experimental Equipment and Materials:
The AQG consists of a control unit (laser system, electronics, power supplies) and a sensor head (dropping chamber, auxiliary sensors like tiltmeters, pressure gauge, classical accelerometer, GPS receiver).
4：Experimental Procedures and Operational Workflow:
The AQG operates at a cycling rate of two drops per second, with data corrected for geographical effects, local tides, atmospheric pressure, tilt variations, and polar motion.
5：Data Analysis Methods:
The sensitivity, stability, and repeatability of the AQG were assessed through continuous time series recordings and comparisons with a super-conducting gravimeter and a free-falling corner cube gravimeter (FG5 #228).
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