Two major types of gravimeters

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Presentation transcript:

Two major types of gravimeters Measuring Gravity Two major types of gravimeters Absolute Gravimeters Relative Gravimeters

Absolute gravimeters use the falling body method Interferometer – compares the phase of the laser beam from the falling reflector in a vacuum with a reference beam

Absolute Gravimeters Precision ~ 0.001 mgal

Worden Gravimeter Zero length spring system – very long resonance period to minimize vibration Temperature compensated

Lacoste-Romberg Gravimeter

Airborne Gravity Measurement

Gravity Profile F. Koch, Forest Park Gravity Experiment, EEG 2009

Free Air Gravity Anomalies of the Earth EIGEN-CG01C Free Air Gravity Anomalies

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