GRAVITY GRADIOMETER

摘要

A gravity gradiometer is described which comprises a pair of sensor bars (41, 43) arranged in housings (45, 47). Transducers (71) are arranged adjacent the bars (41, 43) for measuring movement of the bars in response to the gravity gradient tensor. At least one of the transducers has a sensing coil (510) and a capacitor plate (518a) having a concentric arrangement with the sensing coil (510) for providing one plate of a capacitor used in a balancing circuit for measuring the balance of the sensor mass.