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

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

Published on: February 8, 2014

Three-dimensional solid particle positions in a flow via multiangle off-axis digital holography.

Sebti Boucherit¹, Larbi Bouamama, Halim Benchickh

¹Optic Department, University Ferhat Abbas, Setif, Algeria.

|September 17, 2008

Summary

This study introduces a novel digital off-axis holography technique for precise solid particle tracking in flows. The method offers simultaneous, orthogonal views, overcoming depth-of-focus issues for improved flow visualization.

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Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow

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Published on: February 27, 2016

Area of Science:

Fluid dynamics
Optical metrology
Digital imaging

Background:

Particle image velocimetry (PIV) and holographic methods are crucial for fluid flow analysis.
Traditional holographic techniques face challenges with depth of focus and complex post-processing.

Purpose of the Study:

To develop an advanced digital off-axis (OA) holography system for accurate, instantaneous solid particle position determination in flows.
To provide a simpler, more robust alternative to existing flow visualization methods.

Main Methods:

Utilizes a CCD camera for simultaneous digital recording of two orthogonal views of Fresnel OA holograms.
Employs numerical reconstruction to obtain particle positions.
Applies the technique to 200 µm solid particles in a 5 cm³ stirred flow cell.

Main Results:

The method successfully captures instantaneous, two-orthogonal-view holographic data of particles in motion.
Numerical reconstruction accurately determines particle positions, overcoming depth-of-focus limitations inherent in single-view methods.
The digital, OA approach simplifies the experimental setup and analysis compared to conventional techniques.

Conclusions:

The developed digital OA holography is a significant advancement for instantaneous solid particle position analysis in fluid flows.
This technique offers a simpler, fully digital solution that avoids the drawbacks of in-line holography and overcomes depth-of-focus issues.
The method demonstrates potential for enhanced flow visualization and analysis in various scientific and engineering applications.