Title :
Reduction of ambient magnetic field noise for high-T/sub c/ SQUID applications
Author :
Tralshawala, N. ; Claycomb, J.R. ; Miller, J.H., Jr.
Author_Institution :
Center for Superconductivity, Houston Univ., TX, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
We discuss results of our investigations on ambient noise reduction using localized high-T/sub c/ (HTS) passive magnetic shields. We have quantified our results in terms of shielding factors for ambient noise, and signal-to-noise improvement ratio (SNIR) for source fields. Issues such as the critical fields of our HTS shields and their flux noise are also discussed. The relative merits of this and other noise reduction techniques are discussed vis-a-vis magnetocardiography (MCG) and nondestructive testing (NDT) of materials in an unshielded environment.
Keywords :
SQUIDs; high-temperature superconductors; interference suppression; magnetic shielding; magnetocardiography; nondestructive testing; superconducting device noise; HTS SQUID applications; ambient magnetic field noise reduction; critical fields; flux noise; localized HTS passive magnetic shields; magnetocardiography; nondestructive testing; shielding factors; signal-to-noise improvement ratio; source fields; unshielded environment; High temperature superconductors; Magnetic fields; Magnetic flux; Magnetic materials; Magnetic noise; Magnetic shielding; Noise reduction; Nondestructive testing; Signal to noise ratio; Working environment noise;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
