Thesis-2001-Barnhart.pdf (13.38 MB)

Whole-field holographic measurements of three-dimensional displacement in solid and fluid mechanics

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thesis
posted on 15.08.2018, 08:11 by Donald H. Barnhart
This thesis reports on the development of two, conceptually different, holographic measurement systems for the study of three-dimensional displacement and velocity fields. The first approach reported in this thesis is an intensity correlation-based holographic velocimetry system that employs a reference-multiplexed, off-axis geometry for determining velocity directions using the cross-correlation technique, and a stereo camera geometry for determining three-dimensional fluid velocity fields. The pulsed-laser recording system produces three-dimensional particle images with resolution, signal-to- noise ratio, accuracy and derived velocity fields that are comparable to high-quality two-dimensional photographic PIV (particle image velocimetry). The high image resolution is accomplished by using low f-number optics, a fringe-stabilized processing chemistry, and a phase conjugate play-back geometry that compensates for aberrations in the imaging system. This holographic velocimetry system is then used to successfully measure the volumetric, three-dimensional velocity field of an air nozzle jet flow. In this experiment, more than five million three-dimensional velocity vectors are successfully identified within a single hologram result. [Continues.]

Funding

EPSRC (grant no.: GR/K11147). Royal Society, R.W. Paul Instrument Fund. Rover Group plc.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Publisher

© Donald Barnhart

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2001

Notes

A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.

Language

en

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