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Related Concept Videos

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

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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.
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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...
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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.
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Signal processing techniques are essential for accurately converting continuous signals to digital formats and vice versa. When a continuous signal is sampled with a period T, the resulting sampled signal exhibits replicas of the original spectrum in the frequency domain, spaced at intervals equal to the sampling frequency. To handle this sampled signal, a zero-order hold method can be applied, which creates a piecewise constant signal by retaining each sample's value until the next...
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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.
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Non-iterative phase retrieval by phase modulation through a single parameter.

A P Konijnenberg1, W M J Coene2, H P Urbach1

  • 1Optics Research Group, Delft University of Technology, Delft 2628 CH, The Netherlands.

Ultramicroscopy
|January 3, 2017
PubMed
Summary
This summary is machine-generated.

A new non-iterative phase retrieval method allows complex-valued transmission function retrieval using limited intensity measurements. This adaptable technique offers a direct computational approach for advanced imaging applications.

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Area of Science:

  • Optics and Photonics
  • Computational Imaging
  • Image Reconstruction

Background:

  • Phase retrieval is crucial for reconstructing object properties from intensity measurements.
  • Traditional iterative methods can be computationally intensive and time-consuming.
  • Limited measurements pose challenges for accurate phase reconstruction.

Purpose of the Study:

  • To develop a novel non-iterative phase retrieval method.
  • To enable efficient reconstruction of complex-valued transmission functions.
  • To explore the method's applicability and customization potential.

Main Methods:

  • A non-iterative computational approach using a limited number of intensity measurements.
  • Phase modulation in dual space based on a single optical parameter.
  • General requirement for phase modulation function allowing customization.

Main Results:

  • Successful retrieval of complex-valued transmission functions without iteration.
  • Demonstration that quantitative Zernike phase contrast imaging is a special case.
  • Investigation of sampling requirements for microscopy and Coherent Diffraction Imaging (CDI) setups via simulations.

Conclusions:

  • The proposed non-iterative method provides an efficient alternative for phase retrieval.
  • The method's general phase modulation requirement offers flexibility and broad applicability.
  • Further investigation into sampling requirements is essential for practical implementation in various imaging systems.