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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

108
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...
108
Time and frequency -Domain Interpretation of Phase-lag Control01:21

Time and frequency -Domain Interpretation of Phase-lag Control

120
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...
120
Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

201
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...
201
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

248
Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
248
Time and frequency -Domain Interpretation of PI Control01:27

Time and frequency -Domain Interpretation of PI Control

166
Proportional-Integral (PI) controllers are essential in many control systems to improve stability and performance. They are commonly used in everyday devices like thermostats to enhance system damping and reduce steady-state error. When the zero in the controller's transfer function is optimally placed, the system benefits significantly in terms of stability and accuracy.
Acting as a low-pass filter, the PI controller slows the system's response and extends settling times. This requires...
166
Graphical and Analytic Representation of Sinusoids01:20

Graphical and Analytic Representation of Sinusoids

430
Analyzing two sinusoidal voltages with equal amplitude and period but different phases on an oscilloscope, an instrument used to display and analyze waveforms, involves a three-step process.
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...
430

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相关实验视频

Updated: Jul 25, 2025

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
09:01

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

Published on: April 4, 2017

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和诱导的相位错误补偿方法使用补充相位的方法.

Yingying Wan1, Yiping Cao2, Min Xu1

  • 1School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, China.

Micromachines
|June 28, 2023
PubMed
概括
此摘要是机器生成的。

强度和导致边缘投射特征测量中的测量误差. 一种新的补偿方法使用互补的相位图来取消这些错误,从而实现精确的3D测量.

关键词:
边缘投影的概况测量方法强度和的强度和的强度.减少相位错误,减少相位错误.的相位移转.三维测量的三维测量

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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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相关实验视频

Last Updated: Jul 25, 2025

Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques
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Gain-compensation Methodology for a Sinusoidal Scan of a Galvanometer Mirror in Proportional-Integral-Differential Control Using Pre-emphasis Techniques

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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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科学领域:

  • 光学计量学 在光学计量学
  • 3D测量技术 3D测量技术
  • 计算机视觉 计算机视觉

背景情况:

  • 边缘投射特征测量的强度和导致相位错误和不准确的测量.
  • 现有的方法很难完全弥补和引起的相变.

研究的目的:

  • 开发和验证一种新的补偿方法,以减少N级相位移型谱中强度和引起的相位误差.
  • 在具有高动态范围和潜在和的场景中提高3D测量的准确性.

主要方法:

  • 对N级相位移中的和诱导相位误差的数学模型的分析.
  • 投影额外的N步相位移边缘图案,初始相位移为pi/N,以生成一个补充的相位图.
  • 平均原始和补充相位图,以取消相位错误.

主要成果:

  • 提出的方法有效地减少因强度和引起的相位误差.
  • 模拟和实验证实了相位误差的大幅减少.
  • 在各种场景中实现了精确的3D测量.

结论:

  • 开发的补偿方法成功地减轻了边缘投射特征测量的和诱导的相位误差.
  • 这种技术提高了测量精度,特别是在具有挑战性的照明条件下.
  • 该方法为精确的3D表面重建提供了强大的解决方案.