A physical model of the ideal transformer based on magnetic transmission line theory

Faria, J. A. Brandão

doi:10.1080/09205071.2013.746632

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…In some cases, transformer can be used to increase the voltage or current amplitude, depending on the turning ratio of the transformer. Transformer can transfer impedance based on the turning ratio and may exhibit an apparent increase in relative impedance due to impedance matching of the primary side and secondary side [17].…”

Section: Introductionmentioning

confidence: 99%

Improving SNR and Sensitivity for Low-Coupling EMT Sensors

Zhang

Chen

et al. 2023

IEEE Open J. Instrum. Meas.

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Electromagnetic tomography (EMT), also known as magnetic inductance tomography (MIT) is a tomographic modality widely employed in process industry and bio-medical applications. In particular, this technique plays an important role in imaging metallic objects since it can produce conductivity and permeability distributions in the region of interest. An EMT system consists of a coil array, a data acquisition system and an imaging reconstruction computer. Coils are used to generate electromagnetic field which interacts with the objects under investigation and measure the induced voltages. Conventionally, coils with sufficient inductance coupling (considerable number of turns or dimensions) are used to achieve high sensitivity and good SNR performance. However, this poses limitations for some applications, such as high temperature applications and small-scale facilities. In high temperature applications such as in steel or copper production processes, coils of large number of turns are more likely to be damaged due to breakdown of insulating materials between the turns, resulting in measuring errors. Besides, EMT applied in small-scale facility requires sensors with reduced dimensions, which results in weak magnetic coupling and lower SNR. In order to address these issues, this paper proposes a method to transform the impedance and hence increase the sensor signal level through designing boosting transformers. Simulation and experimental results suggest that this increases the system SNR and image stability.

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Section: Introductionmentioning

confidence: 99%

Improving SNR and Sensitivity for Low-Coupling EMT Sensors

Zhang

Chen

et al. 2023

IEEE Open J. Instrum. Meas.

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“…If a literature search on MGTLs is carried out, very scarce information will be found. In addition to [14][15][16], references to MGTLs can only be found in patent [17] dated of 1968 aimed at transients suppression in a power transformer, and also in a recent patent [18] where future terahertz applications of MGTL are speculated. The theoretical background for two-wire homogeneous magnetic transmission-line analysis has been set in [14], considering the quasi TEM approach.…”

Section: Introductionmentioning

confidence: 99%

“…The theoretical background for two-wire homogeneous magnetic transmission-line analysis has been set in [14], considering the quasi TEM approach. An application of MGTL theory to the analysis of ideal transformers has been provided in [15]. The evaluation of the per unit length magnetic reluctance of magnetic wires has been presented in [16] for the case of cylindrical Euler-Cauchy wires.…”

Section: Introductionmentioning

confidence: 99%

Formulation of Multiwire Magnetic Transmission-Line Theory

Faria¹

2013

PIER B

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Abstract-Time-and frequency-domain theory of multiwire magnetic transmission lines is presented for the first time. The familiar theory of electric multiconductor transmission lines (MTL) is based on the manipulation of two matrices, the longitudinal impedance and the transverse admittance. However, for magnetic MTLs, the key matrices are the transverse impedance and the longitudinal admittance. It is shown how the latter matrices are defined and how they should be used to determine the modal propagation constants and modal characteristic wave admittances that characterize the various travelling wave modes of magnetic MTLs. The theory is illustrated considering a three-wire system with three-fold symmetry. Simulation results, in the range 0.1 GHz to 10 GHz, are presented, showing that the magnetic MTL can exhibit superluminal phase velocity and zero attenuation dispersion.

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Reformulation of magnetic transmission line theory using magnetic charges, magnetic currents, and magnetic voltages

Faria

2013

Journal of Electromagnetic Waves and Applications

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A physical model of the ideal transformer based on magnetic transmission line theory

Cited by 5 publications

References 13 publications

Improving SNR and Sensitivity for Low-Coupling EMT Sensors

Improving SNR and Sensitivity for Low-Coupling EMT Sensors

Formulation of Multiwire Magnetic Transmission-Line Theory

Reformulation of magnetic transmission line theory using magnetic charges, magnetic currents, and magnetic voltages

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