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Related Experiment Video

Updated: Jun 12, 2026

High-speed Particle Image Velocimetry Near Surfaces
11:59

High-speed Particle Image Velocimetry Near Surfaces

Published on: June 24, 2013

Particle image fields and partial coherence.

R Rubinstein, P S Greenberg

    Applied Optics
    |June 26, 2010
    PubMed
    Summary
    This summary is machine-generated.

    The accuracy of Young's fringe method is limited by background noise from seeding particles. This study analyzes the background field

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    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

    Published on: October 11, 2016

    Area of Science:

    • Fluid dynamics
    • Optical measurement techniques

    Background:

    • Young's fringe method is crucial for velocity field measurements.
    • Spatially incoherent background fields, caused by random seeding particle locations, degrade accuracy.

    Purpose of the Study:

    • To analyze the characteristics of the background field in Young's fringe velocimetry.
    • To determine the impact of particle count on background field properties.

    Main Methods:

    • Derivation of the probability density function for the spatial frequency cutoff.
    • Analysis of the power distribution across frequency intervals.
    • Application of the Van Cittert-Zernike theorem.

    Main Results:

    • The background field's spatial frequency cutoff is dependent on particle count.
    • The power spectrum of the background field was determined.
    • Conditions for the applicability of the Van Cittert-Zernike theorem were established.

    Conclusions:

    • The background field approximates a partially coherent source in high particle count scenarios.
    • Significant deviations from this approximation occur at low and moderate particle counts.
    • Understanding these limitations is key for accurate velocimetry.