Electricity: measuring and testing – Magnetic – Magnetometers
Patent
1989-12-21
1991-04-16
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Magnetometers
505846, G01R 3302, G01R 33035
Patent
active
050086227
ABSTRACT:
An improved pick-up coil system for use with Superconducting Quantum Interference Device gradiometers and magnetometers involving the use of superconducting plates near conventional pick-up coil arrangements to provide imaging of nearby dipole sources and to deflect environmental magnetic noise away from the pick-up coils. This allows the practice of gradiometry and magnetometry in magnetically unshielded environments. One embodiment uses a hemispherically shaped superconducting plate with interior pick-up coils, allowing brain wave measurements to be made on human patients. another embodiment using flat superconducting plates could be used in non-destructive evaluation of materials.
REFERENCES:
patent: 3435337 (1969-03-01), Inouye et al.
patent: 3924176 (1975-12-01), Fletcher et al.
patent: 4700135 (1987-10-01), Hoenig
I. W. C. Overton, Jr., D. B. van Hulsteyn, and E. R. Flynn, "Use of Superconducting Imaging Surfaces to Enhance Detection of Weak Magnetic Sources by SQUID Systems", Los Alamos National Laboratory document LA-11473-MS, (issued Jan. 1989).
W. C. Overton, Jr., D. B. van Hulsteyn, and E. R. Flynn, "Use of Superconducting Plates and Shells to Deflect Magnetic Noise Fields", Application to MEG, Proc. of the Annual Conf. of the IEEE Engineering in Medicine and Biology Soc., vol. II, p. 1293 (1989).
Flynn Edward R.
Overton, Jr. William C.
van Hulsteyn David B.
Gaetjens Paul D.
Moser William R.
Snow Walter E.
United States Department of Energy
Wyrick Milton D.
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