| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect magnetic signals stably, despite a current direction of the signal source. <P>SOLUTION: It is an aspect of the present invention to provide a magnetic detection coil 1b made of a single wire of one of superconducting and metallic materials. Four second-order differential coils 21 to 24 are arranged so that a geometric figure obtained by connecting the respective centers of the four differential coils 21 to 24 can form a parallelogram. By providing intersections 25 to 27 between the four second-order differential coils 21 to 24, the values of magnetic flux respectively penetrating the differential coils 21 to 24 are differentiated in three different directions. <P>COPYRIGHT: (C)2009,JPO&INPIT |
