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相关概念视频

Time and frequency -Domain Interpretation of Phase-lead Control01:24

Time and frequency -Domain Interpretation of Phase-lead Control

75
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...
75

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相关实验视频

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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基于复合圆形边缘的相位测量偏移计.

Yanjun Fu, Xinlu Li, Guangyu Jiang

    Optics express
    |January 29, 2025
    PubMed
    概括

    这项研究引入了一种使用复合圆边缘的更快相位测量偏向测量 (PMD) 技术. 这种方法提高了对镜面表面的测量速度和表面细节检测.

    科学领域:

    • 光学计量学 在光学计量学
    • 表面检查检查 表面检查

    背景情况:

    • 传统的相位转移测量是耗时的,并且在检测细表面特征方面有限.
    • 现有的方法在较大的曲率镜面表面上扎.

    研究的目的:

    • 提出一种使用复合圆形边缘的相位测量偏移计 (PMD) 技术,以提高速度和适应性.
    • 为了提高检测小的形状变化和细微的表面细节的灵敏度.

    主要方法:

    • 开发一种使用复合圆形边缘的相位测量偏向测量 (PMD) 技术.
    • 基于最大对比率的相提取算法的实现.
    • 将所需的边缘投影图像减少了一半.

    主要成果:

    • 复合圆形边缘提供更的相变,改善检测更细微的表面特征.
    • 该技术只需要四个边框图像,将投影数量减半.
    • 与传统方法相比,观察到根-平均-平方误差 (RMSE) 和峰值-谷 (PV) 值的显著改善.

    结论:

    • 拟议的复合圆边缘PMD技术显著提高了测量速度和灵敏度.
    • 这种方法对于检查具有较大曲率的镜面表面具有很高的适应性.

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  • 该技术在细微的表面细节和形状变化方面提供了卓越的性能.