Thermal magnetic noise generated by an eddy current shielded room

Journal Article · Tue Apr 01 04:00:00 EST 1986 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1138885· OSTI ID:6113993

Stroink, G; MacAulay, C

Using a SQUID-based second-order gradiometer, we have measured the thermal magnetic noise generated by a thick aluminum plate and an eddy current shielded room used for biomagnetic measurements. The measured noise agrees with the theoretical prediction for the thermal noise fields generated by infinite conducting slabs. The noise is substantial near the walls of the shielded room, but is predicted to be less than 0.02 fT/..sqrt..Hz at 1 Hz at the center of the room. This is too small to influence the biomagnetic measurements usually taken at this location.

• Research Organization: Dalhousie University, Physics Department, Halifax, N. S., Canada B3H 3J5
• OSTI ID: 6113993
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 57:4; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BIOLOGICAL EFFECTS
BIOLOGICAL SHIELDING
CURRENTS
EDDY CURRENT TESTING
EDDY CURRENTS
ELECTRIC CURRENTS
ELECTROMAGNETIC TESTING
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
MAGNETIC SHIELDING
MAGNETOMETERS
MATERIALS TESTING
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NOISE
NONDESTRUCTIVE TESTING
PERFORMANCE
PLATES
SHIELDING
SQUID DEVICES
SUPERCONDUCTING DEVICES
TEMPERATURE NOISE
TESTING