Continuous high-precision gravity measurement over 5 months of a
Portable Atom Gravimeter in field application
We report a portable and robust home-built atom gravimeter (USTC-AG11)
continuously working in a seismic station over 5 months. Based on the
principle of matter-wave interference, the atom gravimeter is very
sensitive to the local gravity and can reach the precision of micro-Gal
(1×10-8m=s2) level. With the technique of vibrational compensation, the
sensitivity of the atom gravimeter reaches 38 µGal=pHz, which is almost
immune to the ground vibration noise. The design of the atom gravimeter
in the electronics and laser optics, especially the laser frequency and
phase auto-relock technology, guarantees the long term continuous
running. The long-term precision of the atom gravimeters is better than
2 µGal, which is comparable to the best classical gravimeter FG-5(X).
Our work provides a novel application for the high precision atomic
gravimeter based on modern quantum sensing technology in the field of
geophysics and geodesy survey.