Reduction of ambient magnetic field noise for high-T/sub c/ SQUID applications

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 critica...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.2890-2893
Main Authors: Tralshawala, N., Claycomb, J.R., Miller, J.H.
Format: Article
Language:English
Subjects:
High temperature superconductors
Magnetic fields
Magnetic flux
Magnetic materials
Magnetic noise
Magnetic shielding
Noise reduction
Nondestructive testing
Signal to noise ratio
Working environment noise
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Summary: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.
ISSN:1051-8223
1558-2515
DOI:10.1109/77.621897