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

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

258

Lastpage

260

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-T_c scanning SQUID microscope.

Keywords

SQUIDs; current density; fast Fourier transforms; image resolution; inverse problems; microscopy; 2D images; 2D source currents; current density images; high-T_c 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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.813699

Filename

1211590