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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
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The Maximum Power Transfer Theorem01:20

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Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
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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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Power Dissipated in a Circuit: Problem Solving01:15

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The equivalent resistance of a combination of resistors depends on their values and how they are connected.
The simplest combinations of resistors are series and parallel connections. In a series circuit, the first resistor's output current flows into the second resistor's input; therefore, each resistor's current is the same. Thus, the equivalent resistance is the algebraic sum of the resistances. The current through the circuit can be found from Ohm's law and is equal to the...
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Node Analysis for AC Circuits01:14

Node Analysis for AC Circuits

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Consider an angioplasty system featuring a catheter equipped with a turbine, a critical tool for removing plaque deposits from coronary arteries. This intricate medical device operates using a circuit model reminiscent of a dual-node RLC circuit powered by a current-controlled voltage source.
To unravel the complexities of this system, nodal analysis is employed, a powerful technique founded on Kirchhoff's current law (KCL), which remains valid for phasors. AC circuits can effectively be...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Safety analysis for a distributed coupled-cavity laser-based wireless power transfer.

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    Distributed coupled-cavity laser (DCCL) wireless power transfer (WPT) systems demonstrate enhanced safety for skin and eyes, with lower irradiance on intruding objects. These systems offer practical, long-range, and safe energy transfer solutions.

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    Area of Science:

    • Optics and Photonics
    • Wireless Communications
    • Biomedical Engineering

    Background:

    • Intracavity laser systems are crucial for advanced wireless applications.
    • Distributed coupled-cavity lasers (DCCL) offer expanded field of view (FoV) and improved safety.
    • Wireless power transfer (WPT) systems require rigorous safety assessments.

    Purpose of the Study:

    • To investigate the safety of DCCL-WPT systems.
    • To assess skin safety, eye safety, and sensitivity to small object intrusion.
    • To quantify irradiation levels and evaluate exposure risks.

    Main Methods:

    • Developed a safety analysis model simulating intracavity beam propagation using diffraction modeling and gain-loss dynamics.
    • Formulated an eye safety evaluation using a human head model and ray tracing.
    • Analyzed case studies for skin safety, eye safety, and small object intrusion.

    Main Results:

    • DCCL-WPT systems achieve over 600 mW charging power at 5 m under skin-safe conditions (100 mW over 16° FoV).
    • Irradiance on intruding objects is nearly 50% lower than single-cavity systems.
    • Eye safety is maintained with 150 mW charging power, well above typical thresholds, and cornea exposure is the primary concern.
    • The system exhibits high sensitivity to small object intrusion, aiding hazard mitigation.

    Conclusions:

    • DCCL-WPT systems are practical for mobile, long-range, and safe energy transfer.
    • The study provides a foundation for safety-aware optimizations in real-world DCCL-WPT deployments.
    • Findings confirm the enhanced safety profile of DCCL configurations for WPT applications.