A gravity gradiometer is an instrument to measure gravity gradients caused by local density variations. Gravity gradiometers can be used for surveys of soil moisture and exploration of underground resources. We are developing a portable gravity gradiometer, which is suitable for field measurements. In our gravity gradiometer, a pair of test masses set at different heights (separated by about 70 cm) in a vacuum tank is tossed up at the same time. The vertical gravity gradients are obtained by measuring differential acceleration between the test masses that are in free fall, using a Michelson interferometer.
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