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Related Concept Videos

Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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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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The phase rule describes the relationship between the variance (degrees of freedom), the number of components, and the number of phases in a system at equilibrium.Variance is a concept that denotes the number of independent intensive properties (properties are those that do not depend on the amount of material in the system), such as temperature, pressure, and composition, that can be altered without impacting the number of phases in equilibrium.In a single-component system, such as pure water,...
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Published on: January 28, 2019

Phase from chromatic aberrations.

Laura Waller1, Shan Shan Kou, Colin J R Sheppard

  • 1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA. lwaller@alum.mit.edu

Optics Express
|December 18, 2010
PubMed
Summary
This summary is machine-generated.

This study presents a new method for accurately computing phase objects from a single brightfield microscope image. The technique leverages inherent chromatic aberration for phase contrast, enabling real-time quantitative phase imaging without hardware changes.

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Area of Science:

  • Optical microscopy
  • Image processing
  • Biophysics

Background:

  • Phase objects are crucial in various scientific fields but challenging to image quantitatively.
  • Traditional phase contrast microscopy often requires specialized hardware modifications.
  • Existing methods for quantitative phase recovery can be complex and time-consuming.

Purpose of the Study:

  • To develop a hardware-free method for accurate quantitative phase recovery from single brightfield microscope images.
  • To utilize the inherent chromatic aberration of lenses as a phase contrast mechanism.
  • To enable real-time phase imaging in conventional microscopes.

Main Methods:

  • A modified Transport of Intensity Equation (TIE) solution was employed.
  • The technique exploits the natural chromatic aberration present in all lens-based imaging systems.
  • Quantitative phase recovery was achieved from a single color image.

Main Results:

  • Accurate computation of phase objects from single color images was demonstrated.
  • The method successfully used chromatic aberration as a phase contrast mechanism.
  • Real-time quantitative phase imaging was achieved in a standard brightfield microscope.

Conclusions:

  • The proposed technique offers a simple, inexpensive, and effective solution for quantitative phase imaging.
  • No hardware modifications are necessary, making it widely applicable to traditional microscopes.
  • This approach facilitates real-time phase recovery, advancing imaging capabilities in microscopy.