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Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...

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Related Experiment Video

Updated: Jul 4, 2026

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects
10:16

Digital Inline Holographic Microscopy (DIHM) of Weakly-scattering Subjects

Published on: February 8, 2014

Digital three-color holographic interferometry for flow analysis.

Jean-Michel Desse1, Pascal Picart, Patrice Tankam

  • 1Office National d'Etudes et Recherches Aérospatiales, 5, Boulevard Paul Painlevé, 59045, Lille, France. Jean-Michel.Desse@onera.fr

Optics Express
|June 11, 2008
PubMed
Summary
This summary is machine-generated.

A novel digital holographic interferometer measures refractive index changes from a candle flame using a three-layer sensor. This method accurately extracts optical path differences, enabling detailed flame analysis.

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Last Updated: Jul 4, 2026

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Area of Science:

  • Optics and Photonics
  • Interferometry
  • Holography

Background:

  • Refractive index variations are crucial for understanding phenomena like flame dynamics.
  • Traditional interferometry methods can be complex for simultaneous multi-wavelength analysis.

Purpose of the Study:

  • To design and demonstrate a digital three-color holographic interferometer for analyzing refractive index changes.
  • To enable simultaneous recording and analysis of holographic data at three wavelengths.

Main Methods:

  • Development of a digital three-color holographic interferometer utilizing a three-layer photodiode stack sensor.
  • Application of Fourier transform for phase map calculation and spectral filtering to remove unwanted diffraction orders.
  • Simultaneous three-wavelength measurement to determine contributions of each color to the refractive index change.

Main Results:

  • Successful generation and recording of color holograms with high spatial resolution.
  • Accurate calculation of phase maps and isolation of contributions from each wavelength.
  • Demonstration of extracting zero-order fringes (zero optical path difference) using modeled fringe patterns or wrapped phases.

Conclusions:

  • The developed digital three-color holographic interferometer is effective for analyzing refractive index variations.
  • Simultaneous multi-wavelength holographic recording provides robust data for optical path difference analysis.
  • The system allows for straightforward extraction of zero optical path difference information from experimental data.