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dc.contributor.authorLally, Evan M.en_US
dc.date.accessioned2014-03-14T20:11:35Z
dc.date.available2014-03-14T20:11:35Z
dc.date.issued2010-04-28en_US
dc.identifier.otheretd-05042010-195336en_US
dc.identifier.urihttp://hdl.handle.net/10919/27542
dc.description.abstractOf the wide variety of existing optical techniques for non-contact 3D surface mapping, Fourier Transform Interferometry (FTI) is the method that most elegantly combines simplicity with high speed and high resolution. FTI generates continuous-phase surface maps from a projected optical interference pattern, which is generated with a simple double-pinhole source and collected in a single snapshot using conventional digital camera technology. For enhanced stability and reduced system size, the fringe source can be made from a fiber optic coupler. Unfortunately, many applications require mapping of surfaces that contain challenging features not ideally suited for reconstruction using FTI. Rough and discontinuous surfaces, commonly seen in applications requiring imaging of rock particles, present a unique set of obstacles that cannot be overcome using existing FTI techniques. This work is based on an original analysis of the limitations of FTI and the means in which errors are generated by the particular features encountered in the aggregate mapping application. Several innovative solutions have been developed to enable the use of FTI on rough and discontinuous surfaces. Through filter optimization and development of a novel phase unwrapping and referencing technique, the Method of Multiple References (MoMR), this work has enabled surface error correction and simultaneous imaging of multiple particles using FTI. A complete aggregate profilometry system has been constructed, including a MoMR-FTI software package and graphical user interface, to implement these concepts. The system achieves better than 22µm z-axis resolution, and comprehensive testing has proven it capable to handle a wide variety of particle surfaces. A range of additional features have been developed, such as error correction, particle boundary mapping, and automatic data quality windowing, to enhance the usefulness of the system in its intended application. Because of its high accuracy, high speed and ability to map varied particles, the developed system is ideally suited for large-scale aggregate characterization in highway research laboratories. Additionally, the techniques developed in this work are potentially useful in a large number of applications in which surface roughness or discontinuities pose a challenge.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartLally_EM_D_2010.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectOptical Profilometryen_US
dc.subject3D Surface Mappingen_US
dc.subjectPhase Unwrappingen_US
dc.subjectImage Processingen_US
dc.subjectMethod of Multiple Referencesen_US
dc.subjectAggregate Particlesen_US
dc.subjectFourier Transform Interferometryen_US
dc.titleFourier Transform Interferometry for 3D Mapping of Rough and Discontinuous Surfacesen_US
dc.typeDissertationen_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.degreePh. D.en_US
thesis.degree.namePh. D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineElectrical and Computer Engineeringen_US
dc.contributor.committeechairWang, Anboen_US
dc.contributor.committeememberXu, Yongen_US
dc.contributor.committeememberGuido, Louis J.en_US
dc.contributor.committeememberWang, Linbingen_US
dc.contributor.committeememberPoon, Ting-Chungen_US
dc.contributor.committeememberSafaai-Jazi, Ahmaden_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-05042010-195336/en_US
dc.date.sdate2010-05-04en_US
dc.date.rdate2010-06-07
dc.date.adate2010-06-07en_US


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