Computational aspects of particle image size and velocity measurements

Bibliographic Details
Main Author:	Sanaye, Sepehr
Language:	English
Published:	Case Western Reserve University School of Graduate Studies / OhioLINK 1994
Subjects:	particle image size velocity
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=case1058207972

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-case10582079722021-08-03T05:31:04Z Computational aspects of particle image size and velocity measurements Sanaye, Sepehr particle image size velocity The measurement of the shape, size, concentration and velocity of particles or bubbles moving with a fluid flow is studied by processing computer stored images. A single image of the particles illuminated by a laser sheet is used to determine the size and shape of the objects including irregularities and holes. Cross-correlation technique using a Fast Fourier Transform algorithm is applied to consecutive images of the particles to determine the displacement vectors and velocities. A computer simulated experimental flow with particles is used to demonstrate the ability of the developed techniques to handle: a random number and random initial position for the particles in the interrogation area when the expected particle number density is known, particle images that overlap, enter, leave or get cut by the edges of interrogation area, and particles of a non-integer number of pixels in size and displaced by a non-integer number of pixels in either direction within the light-sheet. An approximate Maximum Likelihood Estimation (MLE) procedure is developed to predict the displacement error obtained from cross-correlation measurements. There are various parameters such as particle number density, particle image size, image displacement values and the size of interrogation area, that affect the displac ement error. Variations of the displacement error introduced by parameter changes is studied and estimates of displacement errors obtained from simulation are compared with those predicted by MLE theory. 1994 English text Case Western Reserve University School of Graduate Studies / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=case1058207972 http://rave.ohiolink.edu/etdc/view?acc_num=case1058207972 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	particle image size velocity
spellingShingle	particle image size velocity Sanaye, Sepehr Computational aspects of particle image size and velocity measurements
author	Sanaye, Sepehr
author_facet	Sanaye, Sepehr
author_sort	Sanaye, Sepehr
title	Computational aspects of particle image size and velocity measurements
title_short	Computational aspects of particle image size and velocity measurements
title_full	Computational aspects of particle image size and velocity measurements
title_fullStr	Computational aspects of particle image size and velocity measurements
title_full_unstemmed	Computational aspects of particle image size and velocity measurements
title_sort	computational aspects of particle image size and velocity measurements
publisher	Case Western Reserve University School of Graduate Studies / OhioLINK
publishDate	1994
url	http://rave.ohiolink.edu/etdc/view?acc_num=case1058207972
work_keys_str_mv	AT sanayesepehr computationalaspectsofparticleimagesizeandvelocitymeasurements
_version_	1719421218775367680

Computational aspects of particle image size and velocity measurements

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