• TABLE OF CONTENTS
HIDE
 Title Page
 Copyright
 Acknowledgement
 Table of Contents
 List of Tables
 List of Figures
 Abstract
 Introduction
 The forward problem
 Method of spectral moments
 The reconstruction problem
 Compton scatter tomography
 Summary and conclusions
 Appendix
 Reference
 Bibliography
 Biographical sketch
 Copyright






Title: Tomographic two-phase flow measurement using Compton scattering of gamma rays
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Permanent Link: http://ufdc.ufl.edu/UF00090205/00001
 Material Information
Title: Tomographic two-phase flow measurement using Compton scattering of gamma rays
Physical Description: Book
Language: English
Creator: Bodette, David E. ( Dissertant )
Jacobs, Alan M. ( Thesis advisor )
Carroll, Edward E. ( Reviewer )
Dugan, Edward T. ( Reviewer )
Hanrahan, Robert J. ( Reviewer )
Roan, Vernon P. ( Reviewer )
Publisher: University of Florida
Place of Publication: Gainesville, Fla.
Publication Date: 1986
Copyright Date: 1986
 Subjects
Subjects / Keywords: Compton effect   ( lcsh )
Gamma rays   ( lcsh )
Nuclear Engineering Sciences thesis Ph.D
Tomography   ( lcsh )
Two phase flow   ( lcsh )
Dissertations, Academic -- UF -- Nuclear Engineering Sciences
Genre: bibliography   ( marcgt )
non-fiction   ( marcgt )
theses   ( marcgt )
 Notes
Abstract: Using Compton scattered gamma-rays to measure local void fraction was first suggested by Kondic and Hahn in 1970. The Compton scattered gamma-ray densitometers they suggested employ a single, narrow beam source and either a well collimated detector or an uncollimated detector. The collimated detector configuration only gives the local void fraction measurement in the small volume where the source and detector collimators intersect. The uncollimated detector configuration is a more efficient design since the local void fraction along the source beam’s path is measured in a single reading. A logical extension of the technique is to use wide beam illumination and uncollimated detectors to sample an even greater portion of the flow cross section. This report investigates and demonstrates several methods of inferring two-phase flow parameters using wide beam illumination coupled with two detectors placed symmetrically about he source and pipe. The spatial distribution of the fluid in a slice of the pipe is encoded with respect to energy in the singly scatter photon flux. Two basic techniques are detailed for decoding the spatial information: the method of spectral moments and the method of computed tomography (CT). Examination of the low-order moments of the singly scattered photon spectra from the two detectors provides sufficient information for flow regime identification. Flow asymmetries are revealed by comparison of the spectral moments of the two measured spectra. Further classification of the flow pattern is made on the basis of the first and second moments of the spectra. The real focus of this report is the adaptation and successful demonstration of CT techniques with Compton scattering. Three series expansion techniques are considered: the algebraic reconstruction technique (ART), the simultaneous iterative reconstruction technique (SIRT), and the iterative least squares (ILS) technique. Application of the modified ART, SIRT, and ILS algorithms to a hot-spot and a cold-spot reconstruction problem indicates that SIRT and ILS are more accurate than ART. A more extensive testing of the ILS algorithm for a variety of model flow regimes demonstrates the potential of Compton scatter tomography as a quantitative measurement technique.
General Note: Typescript.
General Note: Vita.
Thesis: Thesis (Ph.D.)--University of Florida, 1986.
Bibliography: Bibliographies : leaves 191-195.
 Record Information
Bibliographic ID: UF00090205
Volume ID: VID00001
Source Institution: University of Florida
Holding Location: University of Florida
Rights Management: All rights reserved by the source institution and holding location.
Resource Identifier: alephbibnum - 000940973
oclc - 16656185

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Table of Contents
    Title Page
        Page i
    Copyright
        Page ii
    Acknowledgement
        Page iii
    Table of Contents
        Page iv
        Page v
    List of Tables
        Page vi
    List of Figures
        Page vii
        Page viii
        Page ix
        Page x
    Abstract
        Page xi
        Page xii
    Introduction
        Page 1
        Page 2
        Page 3
        Page 4
        Page 5
        Page 6
        Page 7
        Page 8
        Page 9
    The forward problem
        Page 10
        Page 11
        Page 12
        Page 13
        Page 14
        Page 15
        Page 16
        Page 17
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        Page 28
        Page 29
        Page 30
        Page 31
        Page 32
        Page 33
        Page 34
    Method of spectral moments
        Page 35
        Page 36
        Page 37
        Page 38
        Page 39
        Page 40
        Page 41
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        Page 52
        Page 53
    The reconstruction problem
        Page 54
        Page 55
        Page 56
        Page 57
        Page 58
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        Page 83
        Page 84
        Page 85
        Page 86
        Page 87
        Page 88
        Page 89
    Compton scatter tomography
        Page 90
        Page 91
        Page 92
        Page 93
        Page 94
        Page 95
        Page 96
        Page 97
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        Page 111
        Page 112
        Page 113
        Page 114
        Page 115
        Page 116
        Page 117
    Summary and conclusions
        Page 118
        Page 119
        Page 120
        Page 121
        Page 122
        Page 123
        Page 124
        Page 125
        Page 126
        Page 127
        Page 128
        Page 129
    Appendix
        Page 130
        Page 131
        Page 132
        Page 133
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        Page 185
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        Page 188
        Page 189
        Page 190
    Reference
        Page 191
        Page 192
        Page 193
        Page 194
    Bibliography
        Page 195
    Biographical sketch
        Page 196
        Page 197
        Page 198
    Copyright
        Copyright
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