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Related Concept Videos

Mesh Analysis for AC Circuits01:12

Mesh Analysis for AC Circuits

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In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
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Energy Stored In A Coaxial Cable01:31

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic field inside...
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Source Transformation for AC Circuits01:11

Source Transformation for AC Circuits

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The process of source transformation in the frequency domain entails the conversion of a voltage source, positioned in series with an impedance, into a current source that is parallel to an impedance, or the other way around. It is essential to maintain the following relationships while transitioning from one source type to another.
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Cable Subjected to a Distributed Load01:24

Cable Subjected to a Distributed Load

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The analysis of suspension bridges is a complex and critical process that involves multiple factors, including the shape and tension of the main cables. The main cables of suspension bridges are subjected to distributed loads, which result in changes in tensile forces and deformation of the cable. These loads must be carefully considered to ensure that the bridge is safe and capable of supporting the weight of different loads.
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Mesh Analysis with Current Sources01:10

Mesh Analysis with Current Sources

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Mesh analysis becomes simpler when analyzing circuits with current sources, whether independent or dependent. The presence of current sources reduces the number of equations required for analysis. Two cases illustrate this:
Current Source in One Mesh: The analysis process is straightforward when a current source is found in only one mesh within the circuit. Mesh currents are assigned as usual, with the mesh containing the current source excluded from the analysis. Kirchhoff's voltage law...
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Performance of an Adaptive Current Source for EIT Driving Loads through a Shielded Coaxial Cable.

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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 6, 2020
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    Summary

    A new high-precision current source for Electrical Impedance Tomography (EIT) compensates for signal loss in coaxial cables. This innovation allows for satisfactory performance even with simple grounded-shield cables, simplifying EIT system design.

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    Area of Science:

    • Electrical Engineering
    • Biomedical Instrumentation
    • Signal Processing

    Background:

    • Coaxial cables in Electrical Impedance Tomography (EIT) significantly impact system performance due to shunt capacitance.
    • Existing solutions like driving cable shields or using active electrodes present challenges such as complexity, stability issues, packaging, and hygiene concerns.
    • There is a need for simpler, robust methods to mitigate signal degradation caused by coaxial cables in EIT systems.

    Purpose of the Study:

    • To introduce and evaluate a novel high-precision current source designed for EIT applications.
    • To assess the performance of this current source when driving loads through coaxial cables.
    • To demonstrate the source's capability to compensate for current lost in shunt impedances, including cable losses.

    Main Methods:

    • Development of a new high-precision current source with adaptive output.
    • Experimental setup to test the current source driving various loads (resistive and complex).
    • Comparison of performance using three coaxial cable configurations: no cable, driven-shield RG-174 cable, and grounded-shield RG-174 cable (up to 1 MHz).

    Main Results:

    • The novel current source successfully compensates for current lost due to shunt impedance.
    • Experimental results up to 1 MHz show similar performance across all tested cable configurations.
    • The source demonstrates satisfactory performance even when using a standard grounded-shield coaxial cable.

    Conclusions:

    • The developed high-precision current source effectively mitigates the detrimental effects of coaxial cable shunt losses in EIT.
    • This technology simplifies EIT system implementation by enabling the use of conventional grounded-shield cables.
    • The findings suggest a more practical and potentially cost-effective approach to EIT instrumentation.