Super-conductive gradiometer coil system for a device for the multichannel testing of weak, changing magnetic fields

摘要

The superconducting gradiometer coil system is intended for a device for multichannel measurement of weak, changing magnetic fields in a field strength range below 10 - 1 ° T. In each channel, this device contains, in addition to at least one detection coil and at least one compensation coil, a superconducting quantum interference element (SQUID) as well as corresponding superconducting connecting elements between these components and also electronic devices for evaluating, processing and displaying those obtained on the quantum interference elements Information. This gradiometer coil system is intended to allow a relatively simple one-off adjustment with the smallest possible active area. For this purpose, the invention provides that at least the gradiometer coils (14, 15) and their mutual connecting elements (19) are applied as planar thin-film structures on a common rigid support body (11), the compensation coils being combined to form a reference coil arrangement (15) which the individual detection coils (14) are arranged. In particular, the compensation coils of the reference coil arrangement (15) can be formed at least in part from individual enclosing loops lying in one plane.