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The iOSG™ Observatory Superconducting Gravity Meter is the latest, lowest-noise observatory-quality SG. It builds on the industry-leading OSG that has formed the core of the Global Geodynamics Project (GGP) network of observatory ravimeters.1,2. Supercurrents flowing in the coils produce a magnetic field which levitates the sphere. The levitating sphere and magnetic field replace the function of the mass and mechanical spring found in other relative gravity meters.
Superconducting persistent currents (i) produce the most stable relative gravity meter in existence. Superconducting persistent currents (i) produce the most stable relative gravity meter in existence. Super stable: Drift less than 0.5 µGal/month Scale factor constant to better than 1 part in 104 for years! Super precise: 1 nanoGal (10-3 µGal) in frequency domain 0.05 µGal in the time domain for 1 minute averaging. Super low noise: 0.3 µGal/(Hz)½.