Three dimensional optical profilometry using a four-core optical fiber

Bulut, Karahan (2004) Three dimensional optical profilometry using a four-core optical fiber. [Thesis]

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Abstract

This study describes the use of a four-core optical fiber for the first time for measurements of three-dimensional rigid-body shapes. A fringe pattern, which was generated by the interference of four wavefronts emitted from the four-core optical fiber, was projected on an object's surface. The deformed fringe pattern containing the information of the objects height was captured by a digital CCD camera. The twodimensional Fourier transformation was applied to the image, which was digitized by using a frame grabber. After filtering this data in its spatial frequency domain by applying a bandpass filter, the two-dimensional inverse Fourier transformation was applied. A phaseunwrapping algorithm was applied to convert this discontinuous phase data to a continuous one. Finally, the shape information of the object was determined. The two-dimensional Fourier transformation analysis used in this study permitted a better signal separation and a better noise reduction. Compared to other optical profilometry techniques, which are based on fiber optics, the use of a four-core optical fiber in this study ruled out the necessity for using a fiber coupler and the alignment of fiber ends. Thus, it increased the compactness and the stability of the fringe projection system.
Item Type: Thesis
Uncontrolled Keywords: Fiber optic -- Profilometry -- Fourier -- Optics -- Fringe
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Materials Science & Eng.
Faculty of Engineering and Natural Sciences
Depositing User: IC-Cataloging
Date Deposited: 17 Apr 2008 10:58
Last Modified: 26 Apr 2022 09:42
URI: https://research.sabanciuniv.edu/id/eprint/8195

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