Reduction of ambient magnetic field noise for high-tc squid applications

IEEE Transactions on Applied Superconductivity

Volumn 7, Issue 2 PART 3, 1997, Pages 2890-2893

  Tralshawala, Nilesh ^a   Claycomb, James R ^a   Miller Jr , John H ^a  

^a UNIVERSITY OF HOUSTON   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

HIGH TEMPERATURE SUPERCONDUCTORS; MAGNETIC SHIELDING; NONDESTRUCTIVE EXAMINATION; SIGNAL TO NOISE RATIO; SQUIDS;

MAGNETOCARDIOGRAPHY;

ACOUSTIC VARIABLES CONTROL;

EID: 0031162184     PISSN: 10518223     EISSN: None     Source Type: Journal    
DOI: 10.1109/77.621897     Document Type: Article

References (11)

1. A. H. Miklich et al "Low-frequency excess noise in YBCO de superconducting devices in static magnetic fields" Appl. Phys. Lett. vol. 64 pp. 3494-3496 1994.
2. J. E. Zimmerman "SQUID instruments and shielding for lowlevel magnetic measurements" Jnl. of Appl. Phys. vol. 48 pp. 702-710 1977.
3. Dr. R. Fagaly unpublished 1986 MCG data private communication.
4. D. Ponnusamy N. Tralshawala J. R. Claycomb K. RaviChander and K. Salama "Processing and characterization of high-Tc shields and flux transformers" elsewhere in these proceedings.
5. Y. Tavrin Y. Zhang W. Wolf and A. I. Braginski "A secondorder SQUID gradiometer operating at 77 K" Supercond. Set. TechnoL vol. 7 pp. 265-268 1994.
6. Quickfleld 3.4 Tera Analysis Inc. Granada Hills CA.
7. N. Tralshawala J. H. Miller Jr. and D. R. Jackson "High-Tc superconducting image surface magnetometers" IEEE Trans on Applied Superconductivity vol. 5 pp. 2354-2357 1995.
8. N. Tralshawala J. R. Claycomb Q. Yiiig J. H. Miller Jr. K. Nesteruk andD. R. Jackson "High-Tc SQUID gradiometers for magnetocardiography in an unshielded environment" Proceedings of the Biomag'96 conference in press.
9. Commercial high-Tc iMAG SQUIDs made by Conductus Inc. Sunny vale CA. At this moment the best noise figure for the state-of-the-art high-Tc SQUIDs is about 28 fT/VWz at 1 Hz; e.g. refer to E. Dantskeret al Appl. Phys. Lett. vol. 67 pp. 725-727 1995.
10. R. H. Koch J. R. Rozen J. Z. Sun and W. J. Gallagher "Three SQUID gradiometer" Appl Phys. Lett. vol. 63 pp. 403-405 1993.
11. N. Tralshawala unpublished.