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

2. 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

3. Absolute Gravimeters
Precision
~ mgal

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

5. Lacoste-Romberg Gravimeter

6. Airborne Gravity Measurement

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

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