Title :
Ultimate limits to magnetic imaging
Author :
Wellstood, F.C. ; Matthews, J. ; Chatraphorn, S.
Author_Institution :
Center for Supercond. Res., Univ. of Maryland, College Park, MD, USA
fDate :
6/1/2003 12:00:00 AM
Abstract :
An inverse transformation based on the Fast Fourier Transform (FFT) can be used to convert two-dimensional (2-D) images of magnetic field into corresponding images of the 2-D source currents that generated the field. We discuss the ultimate limits to the spatial resolution that can be obtained in such current density images when information about the sample is incorporated into the inversion process. We discuss the key parameters and compare our theory to experimental data obtained from a high-Tc scanning SQUID microscope.
Keywords :
SQUIDs; current density; fast Fourier transforms; image resolution; inverse problems; microscopy; 2D images; 2D source currents; current density images; high-Tc scanning SQUID microscope; inverse transformation; inversion process; magnetic field images; magnetic field microscope; spatial resolution limits; two-dimensional images; Current density; Fourier transforms; Image converters; Magnetic fields; Magnetic separation; SQUIDs; Spatial resolution; Superconducting magnets; Two dimensional displays; Wires;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2003.813699
