Keywords : gravimeters

Gravimeters

Gravimetry is the measurement of variations in the field of gravity. The principal behind marine gravimeter operation is not very different from that of those used on land. Measurements are taken continuously as the ship sails, so gyroscope-stabilized platforms were developed to reduce the effect of spurious acceleration due to the boat's roll and pitch.

Measurements are taken using relative gravimeters. These instruments do not measure the absolute value for the field of gravity, but the difference in gravity between two points (Dg). If the absolute value for the field of gravity is known for a point (called the baseline) then the value for another point can be calculated.

The BODENSEEWERK KSS30 spring gravimeter and a LOCKHEED MARTIN BGM 5 with accelerometers are used.

How does it work ?