3:30 PM - 5:00 PM
[SGD01-P04] Comparison of absolute gravity measurements between Absolute Quantum Gravimeter (AQG) and FG5
Keywords:AQG, FG5, Gravity, Antarctica
The Geospatial Information Authority of Japan (GSI) introduced an Absolute Quantum Gravimeter (AQG) made by iXblue in France in 2020.
AQG is a gravimeter based on atomic interferometry, which measures the gravitational acceleration by dropping an object freely as well as an absolute gravimeter FG5 made by Micro g LaCoste in USA. The main feature of AQG is that AQG drop Rubidium atoms cooled down below 2 uK. Therefore, unlike FG5, AQG has almost no mechanical structure, excels in long-term continuous measurement, and does not require periodic maintenance by the manufacturer. In addition, the adjustment for measurement is done almost automatically by the software, so that even unexperienced engineers can operate AQG.
We are verifying the stability and repeatability of AQG in order to establish its operational method. And we have repeatedly conducted test measurements, including concurrent measurements with FG5, mainly at Ishioka Geodetic Observing Station (Ishioka). The concurrent measurements suggest that there is a systematic difference of a few uGal between the two instruments. Therefore, in December 2022, we conducted concurrent measurements of AQG and FG5 at Mount Fuji Research Institute, where the gravity value is about 400 mGal less than that of Ishioka, in order to verify the change in the systematics difference between the two instruments with gravity change. The systematics difference between AQG and FG5 was consistent with that of Ishioka.
In addition, the 63rd Japanese Antarctic Research Expedition (JARE63) conducted comparative measurements of AQG and FG5 at Showa Station, Antarctica, where the gravity value is 2,500 mGal greater than that of Ishioka.
In this presentation, we will report the results of the concurrent measurements of AQG and FG5 at Ishioka and Mount Fuji Research Institute, along with the results of absolute gravity measurements by AQG and FG5 at Showa Station during JARE63.
Acknowledgements
We thank Dr. Honda for his supporting the measurements at Mount Fuji Research Institute, Yamanashi Prefectural Government.
AQG is a gravimeter based on atomic interferometry, which measures the gravitational acceleration by dropping an object freely as well as an absolute gravimeter FG5 made by Micro g LaCoste in USA. The main feature of AQG is that AQG drop Rubidium atoms cooled down below 2 uK. Therefore, unlike FG5, AQG has almost no mechanical structure, excels in long-term continuous measurement, and does not require periodic maintenance by the manufacturer. In addition, the adjustment for measurement is done almost automatically by the software, so that even unexperienced engineers can operate AQG.
We are verifying the stability and repeatability of AQG in order to establish its operational method. And we have repeatedly conducted test measurements, including concurrent measurements with FG5, mainly at Ishioka Geodetic Observing Station (Ishioka). The concurrent measurements suggest that there is a systematic difference of a few uGal between the two instruments. Therefore, in December 2022, we conducted concurrent measurements of AQG and FG5 at Mount Fuji Research Institute, where the gravity value is about 400 mGal less than that of Ishioka, in order to verify the change in the systematics difference between the two instruments with gravity change. The systematics difference between AQG and FG5 was consistent with that of Ishioka.
In addition, the 63rd Japanese Antarctic Research Expedition (JARE63) conducted comparative measurements of AQG and FG5 at Showa Station, Antarctica, where the gravity value is 2,500 mGal greater than that of Ishioka.
In this presentation, we will report the results of the concurrent measurements of AQG and FG5 at Ishioka and Mount Fuji Research Institute, along with the results of absolute gravity measurements by AQG and FG5 at Showa Station during JARE63.
Acknowledgements
We thank Dr. Honda for his supporting the measurements at Mount Fuji Research Institute, Yamanashi Prefectural Government.