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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 7, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Fringe visibility improvement using an asynchronous image-subtracting optically addressed spatial light modulator.

J P Sharpe, P R Barbier, G Moddel

    Applied Optics
    |November 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optically addressed spatial light modulator for particle image velocimetry fringe processing. The device enhances signal-to-clutter ratios and processes low-visibility fringe patterns, improving flow measurement accuracy.

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    Published on: January 28, 2019

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    Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform
    06:25

    Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

    Published on: February 12, 2014

    Area of Science:

    • Optical Engineering
    • Fluid Dynamics
    • Materials Science

    Background:

    • Particle image velocimetry (PIV) is crucial for fluid flow analysis.
    • Accurate fringe processing in PIV is essential for reliable velocity measurements.
    • Existing methods struggle with low-visibility fringe patterns and non-uniform backgrounds.

    Purpose of the Study:

    • To demonstrate an optically addressed spatial light modulator (OASLM) for asynchronous image subtraction in PIV.
    • To evaluate the performance characteristics of the developed OASLM.
    • To show the device's capability in enhancing PIV fringe pattern analysis.

    Main Methods:

    • An OASLM was fabricated using amorphous silicon p-i-n-i-p photosensor and ferroelectric liquid-crystal layers.
    • Images were encoded on separate wavelengths (read: 633 nm, subtract: 670 nm).
    • The device was characterized for frame rate (100 Hz), resolution (3 lp/mm), and sensitivity (≈1 mW/cm²).

    Main Results:

    • The OASLM successfully performed asynchronous image subtraction.
    • Signal-to-clutter ratios of PIV fringe patterns were significantly improved.
    • The device enabled processing of low-visibility fringe patterns previously unprocessable.

    Conclusions:

    • The developed OASLM is effective for advanced PIV fringe processing.
    • It offers improved accuracy and broader applicability in fluid dynamics research.
    • This technology advances optical velocimetry techniques.