Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.392384
Title: Whole-field holographic measurements of three-dimensional displacement in solid and fluid mechanics
Author: Barnhart, Donald H.
ISNI:       0000 0001 3446 5824
Awarding Body: Loughborough University
Current Institution: Loughborough University
Date of Award: 2001
Availability of Full Text:
Access from EThOS:
Access from Institution:
Abstract:
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.
Supervisor: Not available Sponsor: EPSRC ; Royal Society ; Rover Group plc
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.392384  DOI: Not available
Share: