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Related Concept Videos

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.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal...
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Control System Problem01:21

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In an open-loop system, such as a basic thermostat, the poles of the transfer function influence the system's response but do not determine its stability. However, when feedback is introduced to form a closed-loop system, such as an advanced thermostat that adjusts heating based on room temperature, stability is governed by the new poles of the closed-loop transfer function.
When forming a closed-loop system, issues can arise if the poles cross into the unstable region, leading to potential...
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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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Updated: Mar 19, 2026

Constructing a Low-budget Laser Axotomy System to Study Axon Regeneration in C. elegans
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Laser ablation device with a closed-loop control system.

Ulaş Beldek, Kübra Erdoğan, Çağlar Arpali

    Applied Optics
    |March 17, 2026
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    Summary
    This summary is machine-generated.

    This study introduces a laser ablation device with real-time beam power control. The closed-loop system optimizes microchannel creation in polymethylmethacrylate, resulting in smoother profiles and reduced thermal stress.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Manufacturing Technology

    Background:

    • Laser ablation is a key technique for precise material processing.
    • Controlling laser beam power in real-time is crucial for optimizing ablation quality.
    • Existing methods may lack the precision needed for microchannel fabrication.

    Purpose of the Study:

    • To design and implement a laser ablation device with real-time beam power control.
    • To investigate the effects of laser power and intensity on microchannel formation.
    • To optimize the ablation process for improved microchannel geometry and surface quality.

    Main Methods:

    • A closed-loop control system utilizing a rule-based decision-making approach was developed.
    • Real-time measurement of laser beam intensity distribution was employed.
    • Microchannels were fabricated in polymethylmethacrylate (PMMA) material.
    • Ablation quality was assessed using image processing and scanning electron microscopy (SEM).

    Main Results:

    • The closed-loop control system effectively regulated laser power and motor signals based on ablation quality.
    • Analysis of microchannels revealed reduced roughness and residual thermal stress.
    • Experimental results were validated against theoretical calculations and simulations.
    • Smoother channel profiles were achieved through controlled laser beam power.

    Conclusions:

    • The developed laser ablation device with real-time beam power control is effective for material etching.
    • Closed-loop control significantly enhances the quality of microchannel fabrication.
    • This technology offers a pathway to improved precision in microfabrication processes.