Fine balancing second derivative gradiometer

摘要

A fine balancing three-coil type gradiometer, comprising a support member for the coils which consists of two elements, the first of which bears the central coil and one of the end coils, while the second supports the other coil and is arranged to controllably cause the micrometric axial displacement of the element itself with respect to the other one, in order to vary the distance between the planes of the coils and to achieve the desired balancing.