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Related Concept Videos

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

Time and frequency -Domain Interpretation of Phase-lag Control

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

Time and frequency -Domain Interpretation of Phase-lead Control

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...

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Related Experiment Video

Updated: Jun 19, 2026

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

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

Published on: January 28, 2019

Disturbance-free phase-shifting laser diode interferometer using adaptive feedback control.

Takamasa Suzuki1, Tsutomu Takahashi, Osami Sasaki

  • 1Niigata University, Faculty of Engineering, 8050 Ikarashi 2, Niigata 950-2181, Japan. takamasa@eng.niigata-u.ac.jp

Applied Optics
|October 14, 2009
PubMed
Summary
This summary is machine-generated.

A novel phase-shifting laser diode interferometer uses adaptive feedback control to eliminate external disturbances. This innovation enhances measurement accuracy and simplifies signal processing for precise results.

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Last Updated: Jun 19, 2026

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

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

Published on: January 28, 2019

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

Area of Science:

  • Optics and Photonics
  • Metrology
  • Control Systems Engineering

Background:

  • External disturbances significantly impact the accuracy of phase-shifting interferometers.
  • Conventional phase-shifting interferometry faces challenges in signal processing and stability.

Purpose of the Study:

  • To propose a new phase-shifting laser diode interferometer equipped with feedback control.
  • To enhance measurement accuracy and stability by eliminating external disturbances.

Main Methods:

  • Implementation of a feedback control loop for the interferometer.
  • Stabilization of the feedback loop using adaptive control of interference signal polarity.
  • Integration with conventional phase-shifting interferometry techniques.

Main Results:

  • Demonstrated elimination of external disturbances.
  • Achieved simplified signal processing.
  • Confirmed accurate measurement capabilities.
  • Experimental validation of feedback control stability with 1.8 nm repeatability.

Conclusions:

  • The proposed feedback-controlled interferometer offers a robust solution for accurate metrology.
  • Adaptive control effectively stabilizes the system against external disturbances.
  • This approach simplifies processing and enhances the reliability of phase-shifting interferometry.