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Related Concept Videos

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

Phase-lead and Phase-lag Controllers

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 filters, manage...
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 PI Control01:27

Time and frequency -Domain Interpretation of PI Control

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 careful...
PD Controller: Design01:26

PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
PID Controller01:19

PID Controller

Proportional-Integral-Derivative (PID) controllers are widely used in various control systems to enhance stability and performance. In a thermostat, it adjusts heating or cooling based on the temperature difference between the actual and desired levels. They are often used in automotive speed systems, effectively managing sudden speed changes while maintaining a constant speed under varying conditions. On the other hand, PI controllers, commonly employed in voltage regulation, enhance stability...

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Related Experiment Video

Updated: Jun 16, 2026

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
10:33

An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation

Published on: February 27, 2019

Current-controlled phase retardation plate.

B D Zak, B Chang, T Hadeishi

    Applied Optics
    |February 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    A novel current-controlled phase retardation plate using fused quartz offers adjustable birefringence. This stress-induced optical device functions as a fixed plate or a polarization modulator up to several hundred hertz.

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    Published on: April 4, 2017

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    Published on: April 4, 2017

    Area of Science:

    • Optics
    • Materials Science
    • Condensed Matter Physics

    Background:

    • Stress-induced birefringence in optical materials is crucial for various photonic applications.
    • Existing polarization modulators often have limitations in tunability or frequency response.

    Purpose of the Study:

    • To develop a novel current-controlled phase retardation plate.
    • To investigate its utility as a polarization modulator.

    Main Methods:

    • A fused quartz plate was mounted in a magnetic clamp, allowing current-induced stress.
    • The stress controlled the birefringence, thus altering the phase retardation.
    • The device was tested in both direct current (dc) and alternating current (ac) modes.

    Main Results:

    • The device demonstrated effective current control over phase retardation via stress-induced birefringence.
    • It operated reliably as a fixed phase retardation plate in dc mode.
    • In ac mode, it functioned as a polarization modulator at frequencies up to several hundred hertz.

    Conclusions:

    • The developed fused quartz device is a versatile current-controlled phase retardation plate.
    • It offers advantages as a polarization modulator compared to existing technologies.