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Related Concept Videos

Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Inductance: Single-Phase And Three-Phase Line01:28

Inductance: Single-Phase And Three-Phase Line

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Understanding the inductance of transmission lines is crucial for efficient design and operation in electrical power systems. This discussion delves into the inductance characteristics of single-phase two-wire and three-phase three-wire transmission lines with equal phase spacing.
Single-Phase Two-Wire Line:
A single-phase line consists of two solid cylindrical conductors, denoted as x and y. Each conductor carries phasor currents ix and iy, respectively. Given that the sum of these currents is...
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Capacitance: Single-Phase And Three-Phase Line01:25

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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Phase Changes01:19

Phase Changes

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Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
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Phase-lead and Phase-lag Controllers01:22

Phase-lead and Phase-lag Controllers

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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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Related Experiment Video

Updated: Jan 24, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Phase retrieval with extended field of view based on continuous phase modulation.

Xingchen Pan1, Cheng Liu1, Jianqiang Zhu1

  • 1National Laboratory on High Power Laser and Physics, Shanghai, China; Key Laboratory of High Power Laser and Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China.

Ultramicroscopy
|May 22, 2019
PubMed
Summary

This study introduces an advanced coherent modulation imaging (CMI) algorithm to overcome low signal-to-noise ratio (SNR) and limited field of view (FOV) issues. The new method achieves unlimited FOV and superior SNR, enabling high-resolution phase imaging.

Keywords:
Iterative enginePhase imagingPhase retrieval

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Area of Science:

  • Optics and Photonics
  • Image Processing
  • Materials Science

Background:

  • Coherent Modulation Imaging (CMI) faces challenges with low signal-to-noise ratio (SNR) and limited field of view (FOV).
  • Existing methods like ptychography have limitations in SNR and computational requirements.
  • Random speckles in coherent diffractive imaging reduce image quality.

Purpose of the Study:

  • To develop a novel algorithm for extended field of view (FOV) coherent modulation imaging (CMI).
  • To enhance the signal-to-noise ratio (SNR) and resolution in phase imaging.
  • To eliminate random speckles associated with coherent diffractive imaging.

Main Methods:

  • Utilized a weak scattering modulator instead of a strong scattering binary random phase modulator.
  • Integrated probe scanning with the modified CMI approach.
  • Employed a continuous phase plate for error reduction.

Main Results:

  • Achieved an unlimited FOV in a noniterative manner.
  • Demonstrated a superior SNR compared to ptychography.
  • Significantly reduced errors and eliminated random speckles compared to original CMI.
  • Validated results through simulation and experimental data.

Conclusions:

  • The proposed CMI algorithm effectively overcomes SNR and FOV limitations.
  • Enables single-shot or extended FOV phase imaging with high SNR and resolution.
  • Offers a significant advancement for practical applications of CMI.