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Related Concept Videos

Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
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Open and closed-loop control systems01:17

Open and closed-loop control systems

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Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
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Feedback control systems01:26

Feedback control systems

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Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
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Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

86
Phase-lag controllers are widely used in control systems to improve stability and reduce steady-state errors. A dimmer switch controlling the brightness of a light bulb serves as a practical example of phase-lag control, gradually adjusting the bulb's brightness. Mathematically, phase-lag control or low-pass filtering is represented when the factor 'a' is less than 1.
Phase-lag controllers do not place a pole at zero, but instead influence the steady-state error by amplifying any...
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Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

76
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.
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Related Experiment Video

Updated: Jun 8, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
06:42

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Published on: June 8, 2018

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Real-time fully digital control scheme for pulse coherent beam combining.

Yong Wu, Xinyu Wang, Guoqing Pu

    Optics Letters
    |November 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    A novel digital control scheme for non-polarization-maintaining nanosecond pulse coherent beam combining (CBC) achieves full system lock in 9.5 ms. This method enhances scalability and output power for advanced laser systems.

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    Area of Science:

    • Optics and Photonics
    • Digital Control Systems
    • Fiber Lasers

    Background:

    • Coherent beam combining (CBC) is crucial for high-power fiber lasers.
    • Non-polarization-maintaining (non-PM) systems offer advantages but require sophisticated control.
    • Existing control schemes can be complex and slow.

    Purpose of the Study:

    • To propose and experimentally validate a fully digital control scheme for non-PM nanosecond pulse CBC.
    • To integrate digital phase and polarization control for enhanced performance.
    • To demonstrate the system's speed, efficiency, and scalability.

    Main Methods:

    • Digital locking of optical coherence by single-detector electronic-frequency tagging (LOCSET) for active phase control.
    • Stochastic parallel gradient descent (SPGD) for active polarization control.
    • Implementation on a real-time field-programmable gate array (FPGA) hardware platform.

    Main Results:

    • Full system lock achieved in 9.5 ms.
    • Polarization extinction ratio (PER) of the combined beam reached 21.5 dB.
    • Coherent beam combining (CBC) efficiency of 95.3% demonstrated.

    Conclusions:

    • The fully digital control scheme offers a robust solution for non-PM nanosecond pulse CBC.
    • Integration of digital LOCSET and SPGD enhances channel scalability and potential output power.
    • This approach advances high-power fiber laser system development.