Rotating point spread function via pupil-phase engineering

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Sudhakar Prasad1

  • 1Department of Physics and Astronomy, University of New Mexico, Albuquerque, New Mexico 87131, USA. sprasad@unm.edu

Optics Letters
|March 5, 2013
PubMed

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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...