Principles of quasistatic magnetic shielding with cylindrical and spherical shields

Hoburg, James F.

doi:10.1109/15.477342

Cited by 79 publications

(29 citation statements)

References 2 publications

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“…Magnetic materials with high magnetic permeability are commonly adopted for such cases. Two separate physical mechanism participate at determining the electromagnetic shielding in presence of magnetic materials: the "flux shunting" as a consequence of the high permeability of the shield material and the redirection of flux due to induced eddy currents (Hoburg;1995). Both these phenomena together to the magnetic field source characteristics, the geometry of the shield and its relevant position with respect to the magnetic field itself contribute to determine the overall SE of a magnetic shield.…”

Section: Magnetic Shieldsmentioning

confidence: 99%

“…In the second part, we focus on the magnetic shields that received most of the attention for shielding low-frequency magnetic fields (Celozzi & D'Amore;1996;Hoburg;1995;Sergeant et al;. The case of a circular loop magnetically coupled to an indefinite conducting plate and that of a hollow ring shield placed coaxially around a circular loop are treated to support our discussion (Di Fraia et al;.…”

Section: Introductionmentioning

confidence: 99%

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Data Acquisition Systems for Magnetic Shield Characterization

Angrisani¹,

Marracci²,

Pasquino³

et al. 2010

Data Acquisition

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Section: Magnetic Shieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Data Acquisition Systems for Magnetic Shield Characterization

Angrisani¹,

Marracci²,

Pasquino³

et al. 2010

Data Acquisition

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“…In an EMC context, these solutions were generalised by [2] to some extent in order to also include non-canonical geometries in the analysis. More analytical formulas for the magnetic fields inside of cylinders and spheres can be found in [3] and [4]. An approach for cylindrical shields with an arbitrary cross-section at low frequencies is presented in [5].…”

Section: Introductionmentioning

confidence: 99%

Benchmark calculations of magnetic shielding at low frequencies

Happ

Brüns

Gronwald

2014

2014 International Symposium on Electromagnetic Compatibility

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In this paper the shielding against magnetic fields at frequencies between 1 kHz and 10 MHz is investigated. Different methods to calculate the magnetic field inside of closed geometries are compared where three canonical shielding geometries with known analytical solutions are used as numerical benchmarks. By means of a number of examples these benchmark calculations are considered both in frequency and time domain. The results can be taken as reference for EMC modelling software that is used to properly take into account magnetic shielding properties at low frequencies.

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“…ferromagnetic bodies, usually increases the shielding of magnetic fields. Essentially, this is because of the shielding of the result of two synchronously occurring physical mechanism: the flux shunting through the high permeability of the materials and redirection of flux due to induced eddy current [5].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Shield Effectiveness in Low Frequency

Keshtkar¹,

Maghoul²,

Kalantarnia³

2011

IJCEE

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Abstract-Since the early days of radio and telegraph communications, it has been known that a spark gap generates electromagnetic waves rich in spectral content (frequency components) and that these waves can cause interference or noise in various electronic and electrical devices such as radio receivers and telephone communications. Electromagnetic pulses are fields of energy that they can damage electrical and electronic circuits at once. New technology of microelectronic circuits is sensitive to interference power. An intentional or inadvertent risk and unforeseen create irreparable damages, so that it is important to investigate electromagnetic interference from viewpoint: generation source, the effectiveness on electronic components and safekeeping methods. One of the prevalent methods for safekeeping against these pulses is shielding. In this paper, at first, the effect of magnetic field intensity is investigated in frequency selected (0-545Hz) for various shields such as: paramagnetic materials, diamagnetic materials and ferromagnetic materials and shielding effectiveness is calculated for various low frequencies in one point in shield and shielding effectiveness variation with increase in frequency for any material is obtained. In The following of paper, the effect of magnetic field intensity is investigated on shield's two apertures and six apertures. Then, the apertures are displaced on shield surface and shielding effectiveness variation is obtained. This apertures displacement has done for various shield materials. Finally, the effects of composite shields are studied to shielding effectiveness. These shields have combined to two materials. We obtained interesting results from composite shields. In this paper, solution method has chosen 2DFEM and the whole of simulations have done Cosmos/M. Index Terms-Shielding effectiveness, Helmholtz coil, paramagnetic material, diamagnetic material, ferromagnetic material, low frequency.

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Principles of quasistatic magnetic shielding with cylindrical and spherical shields

Cited by 79 publications

References 2 publications

Data Acquisition Systems for Magnetic Shield Characterization

Data Acquisition Systems for Magnetic Shield Characterization

Benchmark calculations of magnetic shielding at low frequencies

Magnetic Shield Effectiveness in Low Frequency

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