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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

80
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...
80
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

87
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...
87
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

165
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...
165
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

86
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...
86
Gain01:15

Gain

173
Gain and phase shift are properties of linear circuits that describe the effect a circuit has on a sinusoidal input voltage or current. The circuit's behavior that contains reactive elements will depend on the frequency of the input sinusoid. As a result, it is observed that the gain and phase shift will all be frequency functions.
Gain:
Suppose Vin is the input and Vout is the output signal to a circuit.
173
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

7.6K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
7.6K

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相关实验视频

Updated: Jun 17, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

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强大的线性相位移算法的理论和应用,用于相位移偏移计方法.

Song Yang1, Xianyong Zhu2, Zhirui Cao3

  • 1School of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, Jilin, China.

Scientific reports
|August 8, 2024
PubMed
概括

一个新的强大的线性相位转移 (RLPS) 算法有效地抑制了光学测量中的玛扭曲和相位调节错误. 这种先进的算法提供了优越的稳定性和准确性,与传统的N步离散里埃变换 (N-DFT) 方法相比.

关键词:
调节错误 调节错误 调节错误马扭曲是因为马扭曲.阶段转移算法 阶段转移算法阶段转移偏向测量法 阶段转移偏向测量法

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相关实验视频

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科学领域:

  • 光学计量学是指光学计量学.
  • 信号处理 信号处理

背景情况:

  • N-步离散里埃转换 (N-DFT) 算法被广泛用于相位移分析.
  • 这些算法面临着玛扭曲和相位调节的挑战,限制了测量准确性.
  • 同时抑制多个错误源仍然是光学计量学的关键挑战.

研究的目的:

  • 分析 N 步 DFT 算法的错误传播特征.
  • 设计一种能够同时抑制玛扭曲和相位调节的新算法.
  • 通过模拟和实验对现有方法进行新算法的性能评估.

主要方法:

  • 基于多项式理论的理论分析,研究N-DFT中的错误传播.
  • 设计和实施一个强大的线性相位移算法 (RLPS).
  • 使用曼努埃尔·塞尔文方法,光谱响应分析和解调强度测试进行性能评估.
  • 使用倾斜平面和形镜子验证算法性能的物理实验.

主要成果:

  • N-DFT算法不能同时抑制马扭曲和相位调节.
  • 该RLPS算法证明了同时抑制两个类型的错误.
  • 与N-DFT和指数算法相比,RLPS表现出优越的稳定性和准确性,特别是在梯度测量,峰值到谷 (PV) 和根-平均-平方 (RMS) 误差减少方面.
  • 物理实验证实RLPS提高了测量稳定性和准确性,在脱调和没有玛校准的情况下.

结论:

  • 通过克服N-DFT的局限性,RLPS算法在光学计量学中取得了重大进展.
  • RLPS提供了增强的稳定性和精度,对于精确的光学表面测量至关重要.
  • 开发的算法对调节和玛扭曲具有强大耐用性,简化了测量程序.