Quasi-stationary fields for microelectronic applications

Dirks, H.K.

doi:10.1007/bf01232924

Cited by 62 publications

(44 citation statements)

References 3 publications

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“…A detailed analysis and a derivation of approximations, that can also be applied to fields generated by fracture of solids as well as the field's coupling to a sensor system, can be found in [28]. Following these approximations while considering typical time scales of crack propagation, the dimensions of the used test set-ups and the conductivities of the tested materials, the quasi-static equations prove to adequately describe the electric fields generated by fracture of polymers.…”

Section: Eme Source Descriptionmentioning

confidence: 99%

Measurement and Study of Electromagnetic Emission Generated by Tensile Fracture of Polymers and Carbon Fibres

Gade

Sause

2016

J Nondestruct Eval

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Electromagnetic emission (EME) signals generated by tensile fracture of four different types of polymers and three different carbon fibre types are presented and discussed. A suitable set-up for the detection of the electric field component of EME generated by fracture of solids is proposed. Basic theoretical considerations are made about the coupling between these field components and the capacitive sensors used to directly measure the short ranged and low frequency (kHz-MHz) electric fields emitted by the generation of free surface charges and their spatial movement as dictated by the vibrational motion of the crack walls. Special focus is put on solids with low conductivity, where the influences of the material on the emitted fields is small and the detected electric signals almost solely depend on the source dynamics and the sensor characteristics. Analysis of the influence of the acquisition circuit is presented. The discussion of the electric signals emitted by tensile fracture of carbon fibres and polymer specimens comprises the influences of the material properties on the signals as well as correlations between the signals and the crack dynamics, including the crack propagation velocities.

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Section: Eme Source Descriptionmentioning

confidence: 99%

Measurement and Study of Electromagnetic Emission Generated by Tensile Fracture of Polymers and Carbon Fibres

Gade

Sause

2016

J Nondestruct Eval

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“…The eddy current model represents a magneto-quasistatic approximation to Maxwell's equations: it is reasonably accurate for slowly varying fields, for which the change in magnetic field energy is dominant, see References [9,10]. Slowly varying, means that ffiffiffiffiffi…”

Section: Eddy Current Modelmentioning

confidence: 99%

Current and voltage excitations for the eddy current model

Hiptmair

Sterz

2004

Int J Numerical Modelling

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We present a systematic study of how to take into account external excitation in the eddy current model. Emphasis is put on mathematically sound variational formulations and on lumped parameter excitation through prescribed currents and voltages. We distinguish between local excitation at known contacts, known generator current distributions and non‐local variants that rely on topological concepts. The latter case entails the violation of Faraday's law at so‐called cuts and prevents us from reconstructing a meaningful electric field. Copyright © 2004 John Wiley & Sons, Ltd.

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“…A derivation of estimations about the regime in which the quasistationary approximation is valid can be found in Haus and Melcher (1989), compare also Dirks (1996). For the timeharmonic case the criterion…”

Section: Maxwell's Equations and The Eqs Modelmentioning

confidence: 99%

Electro-Quasistatic Simulations in Bio-Systems Engineering and Medical Engineering

et al. 2005

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Abstract. Slowly varying electromagnetic fields play a key role in various applications in bio-systems and medical engineering. Examples are the electric activity of neurons on neurochips used as biosensors, the stimulating electric fields of implanted electrodes used for deep brain stimulation in patients with Morbus Parkinson and the stimulation of the auditory nerves in deaf patients, respectively. In order to simulate the neuronal activity on a chip it is necessary to couple Maxwell's and Hodgkin-Huxley's equations. First numerical results for a neuron coupling to a single electrode are presented. They show a promising qualitative agreement with the experimentally recorded signals. Further, simulations are presented on electrodes for deep brain stimulation in animal experiments where the question of electrode ageing and energy deposition in the surrounding tissue are of major interest. As a last example, electric simulations for a simple cochlea model are presented comparing the field in the skull bones for different electrode types and stimulations in different positions.

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Quasi-stationary fields for microelectronic applications

Cited by 62 publications

References 3 publications

Measurement and Study of Electromagnetic Emission Generated by Tensile Fracture of Polymers and Carbon Fibres

Measurement and Study of Electromagnetic Emission Generated by Tensile Fracture of Polymers and Carbon Fibres

Current and voltage excitations for the eddy current model

Electro-Quasistatic Simulations in Bio-Systems Engineering and Medical Engineering

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