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

Volume

7

Issue

2

fYear

1997

fDate

6/1/1997 12:00:00 AM

Firstpage

2890

Lastpage

2893

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;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.621897

Filename

621897