Results 211 to 220 of about 25,004 (243)

Demagnetization of magnetically shielded rooms

Review of Scientific Instruments, 2007
Magnetically shielded rooms for specific high resolution physiological measurements exploiting the magnetic field, e.g., of the brain (dc-magnetoencephalograpy), low-field NMR, or magnetic marker monitoring, need to be reproducibly demagnetized to achieve reliable measurement conditions.
F, Thiel, A, Schnabel, S, Knappe-Grüneberg, D, Stollfuss, M, Burghoff   +4 more
openaire   +2 more sources

Magnetic shielding of Rogowski coils

2017 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2017
This paper describes the impact of Rogowski coil (RC) construction imperfections on measurement errors. A procedure is shown for detecting RC non-homogeneity using a rotary dipole magnetic field inducing a current inside an RC. The influence of RC magnetic shielding on reducing spurious fields is described.
Karel Draxler, Renata Styblikova
openaire   +1 more source

Analog studies of magnetic shields.

AIAA Journal, 1966
Externally deflecting magnets provide a protective region around space vehicles which shields them from the hazardous space radiation. The magnetic shield simulator (MAGSIM) is an analog device that provides a simple means for directly measuring the forbidden volume or protective region produced by externally deflecting magnets.
R. LEPPER, S. LEVINE
openaire   +1 more source

Magnetic shielding and minimization of shielding material

IEEE Transactions on Magnetics, 1994
The guide lines on magnetic shielding in general cases are given. The relationship between leakage fields and electromagnetic properties of ferromagnetic material used in the magnetic shielding is clarified. Along such guide lines, magnetic field analysis is discussed from the viewpoint of minimizing the amount of the shielding material, which is quite
H. Sasaki, T. Shiraishi, A. Kawanishi
openaire   +1 more source

Magnetic shielding for MRI superconducting magnets

IEEE Transactions on Magnetics, 1991
An optical design is presented of a highly homogeneous superconducting coil system with magnetic shielding for magnetic resonance imaging (MRI). The optimal design method is a combination of the hybrid finite-element and boundary-element method for analysis of an axially symmetric nonlinear open-boundary magnetic field problem and a mathematical ...
A. Ishiyama, H. Hirooka
openaire   +1 more source

Frequency Dependence of Shielding Effectiveness of Multilayered Magnetic Shields

Sixteenth International Wrocław Symposium and Exhibition, Electromagnetic Compatibility 2002, 2002
An analysis of magnetic shielding effectiveness of multilayered structures versus frequency is presented. It is shown that the quasistatic field approximation is accurate until several MHz depending on the source-to-observation-point distance, characteristic dimensions of the source, and physical and geometrical properties of layers.
MASSARINI, Antonio, U. REGGIANI, L. SANDROLINI   +2 more
openaire   +2 more sources

Investigation of 2-layer Shield for Magnetic Shielding Considering Magnetic Hysteresis

The 2006 4th Asia-Pacific Conference on Environmental Electromagnetics, 2006
This paper presents the study of 2-layer shielding against power frequency magnetic field in order to increase the shielding effectiveness of the shield. The work has been investigated by finite element method (FEM) considering the hysteresis effect of magnetic materials.
P. Pruksanubal, S. Phoomvutthisarn
openaire   +1 more source

Magnetic Shielding for Coreless Linear Permanent Magnet Motors

Applied Mechanics and Materials, 2013
This paper concerns the local reduction of the magnetic flux density by means of magnetic shielding. Using a spatial frequency description, a 2-D semi-analytical periodic model is obtained for a coreless single-sided linear permanent magnet motor. The magnetic shield is included in the modeling using mode-matching. The obtained magnetic flux density is
Pluk, K.J.W., Jansen, J.W., Lomonova, E.A.   +2 more
openaire   +3 more sources

Magnetic Shielding by Superconducting Films

Journal of Applied Physics, 1962
The magnetic field distribution and supercurrent density are calculated exactly by means of the Maxwell-London equations for the case of an ideal superconducting spherical shell immersed in a steady uniform magnetic field. It is shown that the magnetic field is strongly attenuated by the spherical shell even if the shell thickness is as small as 1000 A.
openaire   +2 more sources

Low-Frequency Magnetic Shielding

2019 IEEE International Symposium on Electromagnetic Compatibility, Signal & Power Integrity (EMC+SIPI), 2019
For NASA’s Europa Clipper mission, the spacecraft is scheduled to orbit Jupiter for 3.5 years. Magnetic shielding for spacecraft electronics in this environment is challenging, mass is precious and Jupiter’s environmental magnetic fields threaten to saturate any magnetic materials on-board.
Reza Ashtari, David H. Jones
openaire   +1 more source