Squid magnetivity having a totally enclosing electromagnetic shield with a predeterminded sheet resistance for low noise
AssigneeU.S. Philips Corporation
InventorsKai-Michael Ludeke, Olaf Dossel, Jurgen Kohler
Life of this patent
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Abstract
A shielding sleeve (19) for SQUID-magnetometers which serves to shield from electromagnetic interference fields, consists of an electrically conductive shielding material so as to obtain adequate RF shielding in conjunction with a low noise contribution, completely envelops a non-shielding cryostat (10), has a predetermined sheet resistance and consists of at least one layer of the shielding material in order to avoid an increase of the magnetometer overall noise.
Claims10
A SQUID-magnetometer comprising a shielding sleeve which serves to shield the magnetometer from electromagnetic interference fields the shielding sleeve comprising a shielding layer consisting of one layer or several sub-layers of electrically conductive shielding material which fully encloses a non-shielding cryostat and which shielding layer has a predetermined sheet resistance value in the range of approximately 50 to 70 m.OMEGA./.quadrature. such that an increase of overall magnetometer noise is substantially avoided.
Dependencies are inferred from the claim text.