Sensitive Superconducting Gravity Gradiometer Constructed with Levitated Test Masses

Over the years, a compact, superconducting gravity gradiometer has been discussed, with the potential for important applications in planetary science, the measurement of gravity waves, and even early warning against earthquakes. Its test-mass dynamics, levitation, and successful operation still need to be verified, though. This study describes the design and construction of the instrument, and reports detailed results and the issues encountered along the way. The data suggest that this promising technology could deliver otherwise unobtainable gravity maps, which can be translated to planetary structural data.