SQUID instruments and shielding for low-level magnetic measurements

Journal Article · Mon Jan 31 23:00:00 EST 1977 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.323659· OSTI ID:7324499

Zimmerman, J E

We have used a thick-walled aluminum enclosure to provide low-frequency shielding for biomagnetic studies with SQUID magnetic gradiometers. The shield provides an attenuation proportional to frequency above 1/3 Hz. A 24-hole fractional-turn SQUID gradiometer has been used in the enclosure to carry out studies of magnetoencephalography on humans. An ''asymmetric'' configuration for a second-derivative gradiometer has been developed which provides a significant increase in sensitivity and resolution over more conventional symmetric arrays. (AIP)

• Research Organization: Cryogenics Division, Institute for Basic Standards, National Bureau of Standards, Boulder, Colorado 80302
• OSTI ID: 7324499
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 48:2; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALUMINIUM
BIOLOGICAL SHIELDING
DIAGNOSTIC TECHNIQUES
ELECTRONIC EQUIPMENT
ELEMENTS
FLUXMETERS
MAGNETIC SHIELDING
MAGNETOMETERS
MEASURING INSTRUMENTS
METALS
MICROWAVE EQUIPMENT
RESOLUTION
SENSITIVITY
SHIELDING
SQUID DEVICES
SUPERCONDUCTING DEVICES