Abstract
The authors have studied a system, consisting of a superconducting cylinder and a magnetic-flux sensor, for detecting a magnetic dipole selectively in a limited area. The cylinder has an open slit on the side so that the magnetic fields from the magnetic dipole can be measured selectively by its diamagnetic characteristics. Experiments were carried out with a Bi-based high-Tc superconductor and a small magnet as a magnetic dipole. It may be possible for the magnetic flux from the dipole to be detected selectively by means of the system.
