Electromagnetic induction tomography

Peyton, A. J.

doi:10.1016/b978-1-78242-118-4.00003-4

Cited by 12 publications

(11 citation statements)

References 55 publications

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“…A reduction in the measured voltage is observed when the thickness of the sample increases. This reduction is in accordance with simulations using the method in Section III and the magnetic induction effect for highly conductive, nonmagnetic samples [12].…”

Section: Resultssupporting

confidence: 89%

“…The conductivity and magnetic permeability of the sample affect the magnetic induction due to eddy currents and magnetic polarisation, and the effects can be measured through the induced voltage across the receiver coil [12]. As the magnetic field depends on the coil geometry, the sensitivity of the sensor is intrinsically related to its geometry.…”

Section: A Inductive Sensing Modementioning

confidence: 99%

“…The change in mutual inductance between the transmitter and the receiver can be detected by measuring the differential voltage change at the two terminals of the receiver coil [12]. As stated by Equation ( 5), due to magnetic induction, the change in voltage V is proportional to the changes in mutual inductance M, the current in the transmitter coil I and the angular frequency ω; j is the imaginary unit.…”

Section: Measurements Modes: Differential Mode Common Mode and Simult...mentioning

confidence: 99%

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A Novel Dual Modality Sensor With Sensitivities to Permittivity, Conductivity, and Permeability

et al. 2018

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-In this paper, an electromagnetic (EM) sensor which can operate simultaneously in capacitive and inductive modalities with sensitivities to permittivity, conductivity and permeability is developed, and a novel measurement strategy is proposed accordingly. The sensor is composed of two planar spiral coils with a track width of 4 mm, which promotes its capacitive mode. The capacitive coupling is measured in common mode while the inductive coupling is measured in differential mode. In capacitive mode, the sensor is sensitive to changes in permittivity, i.e. the dielectric material distribution; while in inductive mode, it is sensitive to magnetically permeable material and electrically conductive material. Furthermore, it is demonstrated that the sensor can simultaneously measure dielectric and conductive materials. This novel sensing element has been designed and implemented. Experimental results verified its effectiveness in dual modality measurement.

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Section: Resultssupporting

confidence: 89%

Section: A Inductive Sensing Modementioning

confidence: 99%

Section: Measurements Modes: Differential Mode Common Mode and Simult...mentioning

confidence: 99%

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A Novel Dual Modality Sensor With Sensitivities to Permittivity, Conductivity, and Permeability

et al. 2018

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“…FEM is a computational method whose basic idea consists on finding a complicated problem and replacing it with a simpler one. It is always possible to improve the approximation solution spending more computational effort [ 127 , 128 ].…”

Section: Simulation Softwarementioning

confidence: 99%

Power Losses Models for Magnetic Cores: A Review

et al. 2022

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In power electronics, magnetic components are fundamental, and, unfortunately, represent one of the greatest challenges for designers because they are some of the components that lead the opposition to miniaturization and the main source of losses (both electrical and thermal). The use of ferromagnetic materials as substitutes for ferrite, in the core of magnetic components, has been proposed as a solution to this problem, and with them, a new perspective and methodology in the calculation of power losses open the way to new design proposals and challenges to overcome. Achieving a core losses model that combines all the parameters (electric, magnetic, thermal) needed in power electronic applications is a challenge. The main objective of this work is to position the reader in state-of-the-art for core losses models. This last provides, in one source, tools and techniques to develop magnetic solutions towards miniaturization applications. Details about new proposals, materials used, design steps, software tools, and miniaturization examples are provided.

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“…As a result, the released product is often found to be bulky and expensive considering the tight tolerance and accuracy requirement. As time flies by, many researchers start to explore into a possibility to implement the frequency synthesizer digitally, and there the direct digital synthesizer (DDS) was introduced [1][2][3]. Figure 1 shows the basic DDS block diagram.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Analog to Digital Converter System Clock Source Using Direct Digital Synthesizer

Tung¹,

Mohd‐Mokhtar²

2020

Recent Trends in Communication Networks

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A requirement of multiple format standards by mobile telecommunication (GSM, CDMA, WCDMA, and TD-SCDMA) test set needs to be delivered possibly at lower cost. As to support its capability, phase-locked loop (PLL) frequency synthesizer has been designated as an essential part in most of the design within the box. The old design may be bulky and subject to many issues with the components' variation and aging effect. In recent years, the direct digital synthesizer (DDS) has been popularly in used to replace the PLL architecture. This chapter will focus on the DDS selection, architecture topology, prototyping, implementation technique with both hardware and software, and performance as a clock source to a sampled system as referred to receiver interest. The key parameters in the sampled system greatly rely on the jitter and phase noise specification. If they are not properly defined, the overall signal-to-noise ratio (SNR) at the sampled system output will be impacted. Eventually the receiver quality will be degraded and resulted in tremendous loss. Thus, a proper reconstruction filter design will be delivered to ensure the jitter and phase noise performance is met without degrading the existing specification by taking accountability into the matching characteristic and signal integrity.

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Electromagnetic induction tomography

Cited by 12 publications

References 55 publications

A Novel Dual Modality Sensor With Sensitivities to Permittivity, Conductivity, and Permeability

A Novel Dual Modality Sensor With Sensitivities to Permittivity, Conductivity, and Permeability

Power Losses Models for Magnetic Cores: A Review

Design and Analysis of Analog to Digital Converter System Clock Source Using Direct Digital Synthesizer

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