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相关概念视频

Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

144
Understanding the working function of different types of controllers can be illustrated with practical analogies, such as adjusting a stereo's volume equalizer. Cranking up the bass involves a phase-lead controller, which functions as a high-pass filter, while increasing the treble uses a phase-lag controller, which acts as a low-pass filter. PD controllers, similar to high-pass filters, enhance the system's response to high-frequency components. PI controllers, akin to low-pass...
144
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

78
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...
78

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相关实验视频

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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用只有相位调制-延迟光学配置生成的有形向量束.

Ignacio Moreno, Jeffrey A Davis, María Del Mar Sánchez-López

    Optics letters
    |April 1, 2025
    PubMed
    概括

    研究人员开发了一种新的方法,使用两个液晶空间光调节器 (SLM) 来产生具有可控强度和偏振的矢量束. 这种多功能光学配置可以为先进的应用提供精确的光形.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 激光物理 激光物理

    背景情况:

    • 矢量束为显微镜,光学捕捉和信息处理中的应用提供了独特的特性.
    • 产生具有量身定制的振幅和极化配置的向量束仍然是光学工程中的一个挑战.

    研究的目的:

    • 呈现一种新的光学配置,用于生成具有形状强度和极化分布的向量束.
    • 为了证明所提出的方法的多功能性和有效性,用于创建复杂的光模式.

    主要方法:

    • 使用两个液晶空间光调制器 (SLM) 在级联配置.
    • 在第一个SLM上使用仅相位的计算机生成全息图用于光束成型.
    • 使用第二个SLM作为像素延迟器来控制福里埃转换后的空间偏振.

    主要成果:

    • 成功生成了具有精确控制幅度配置的向量束.
    • 证明了能够创建圆柱体极化向量束图案的能力.
    • 实验结果验证了拟议的光学架构的灵活性和性能.

    结论:

    • 展示的两种SLM配置为生成定制向量束提供了一种多功能和有效的方法.
    • 这种方法为先进的光束成型和极化控制提供了一个强大的平台.

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  • 展示的功能为需要复杂光场的应用程序开辟了新的途径.