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Related Concept Videos

Load-frequency control01:28

Load-frequency control

Load-frequency control (LFC) is vital for maintaining power system stability, ensuring that frequency and power flows remain within acceptable limits during load changes. Turbine-governor control eliminates rotor accelerations and decelerations following load changes. However, a steady-state frequency error persists when the change in the turbine-governor reference setting is zero. In an interconnected power system, each area agrees to export or import a scheduled amount of power through...
Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

Phase-lead controllers are commonly used in various control systems to enhance response speed and stability. Adjusting the brightness on a television screen offers a practical example of phase-lead control. When contrast is enhanced, a phase-lead controller is employed. Mathematically, phase-lead control is identified when the first parameter is smaller than the second.
The design of phase-lead control involves the strategic placement of poles and zeros to balance steady-state error and system...

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Related Experiment Video

Updated: Jun 8, 2026

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
08:17

Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale

Published on: May 25, 2016

Wave-front control using liquid-crystal devices.

J Amako, H Miura, T Sonehara

    Applied Optics
    |September 11, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates precise control over light wave-fronts using liquid-crystal devices (LCDs) for both amplitude and phase modulation. This enables advanced optical applications through computer-generated holograms.

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    Last Updated: Jun 8, 2026

    Free-form Light Actuators — Fabrication and Control of Actuation in Microscopic Scale
    08:17

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    Published on: May 25, 2016

    High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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    Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light
    07:56

    Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

    Published on: September 20, 2017

    Area of Science:

    • Optics and Photonics
    • Liquid Crystal Displays (LCDs)
    • Holography

    Background:

    • Controlling the amplitude and phase of light is crucial for advanced optical systems.
    • Traditional methods for wave-front modulation can be complex and limited in flexibility.
    • Liquid-crystal devices offer a promising avenue for dynamic optical control.

    Purpose of the Study:

    • To achieve complete wave-front control using liquid-crystal devices (LCDs).
    • To independently modulate both amplitude and phase of light.
    • To explore the application of these devices in generating computer-generated holograms.

    Main Methods:

    • Utilized a twisted nematic LCD for amplitude modulation.
    • Employed an electrically controlled birefringent LCD for phase modulation.
    • Optically coupled LCDs with afocal optics and individual driver circuits for 2D independent control.
    • Calculated complex amplitude data for direct recording of on-axis computer-generated holograms.

    Main Results:

    • Achieved complete and independent two-dimensional control over both amplitude and phase.
    • Successfully generated on-axis computer-generated holograms directly from calculated complex amplitude data.
    • Demonstrated the feasibility of using coupled LCDs for sophisticated optical wave-front shaping.

    Conclusions:

    • Liquid-crystal devices provide a powerful platform for dynamic wave-front engineering.
    • Independent amplitude and phase modulation via LCDs enables precise holographic reconstruction.
    • Identified key LCD performance requirements for achieving high-quality optical reconstructions.