A POSSIBLE DEVICE FOR SELECTIVE DETECTION OF MAGNETIC-FIELD SOURCES USING SUPERCONDUCTING AND FERROMAGNETIC CYLINDERS

The authors have studied a system, consisting of superconducting and f erromagnetic cylinders, and a magnetic field sensor for selectively de tecting a magnetic dipole parallel to the extension of the axis of the cylinders. The superconducting cylinder has an open slit in its side so that the magnetic field from the dipole can be measured selectively according to its diamagnetic characteristics. The magnetic fields det ected by the sensor are estimated with the aid of magnetic field analy sis, It may be possible to use the system for positioning of one or tw o parallel dipoles. The system will be useful for nondestructive testi ng of metallic materials. (C) 1997 American Institute of Physics.