In order for direction of the energisation magnetic field and direction of the bias electric current which flows to the Josephson junction section

摘要

PROBLEM TO BE SOLVED: To provide a planar thin-film SQUID differential magnetic flux sensor having a special structure which makes any magnetic flux trap difficult to occur at a Josephson junction, and to provide a non-destructive inspection apparatus using it.;SOLUTION: In the planar thin-film SQUID differential magnetic flux sensor which has a primary or more differential magnetic flux detecting coil for measuring a magnetic field differentiation, a SQUID ring is directly coupled with the magnetic flux detecting coil such that bias current flows in the Josephson junction in the SQUID ring along a direction parallel to a direction of an exciting magnetic field.;COPYRIGHT: (C)2007,JPO&INPIT