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An interferometric vibration sensor based on a four - core optical fiber

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dc.contributor Graduate Program in Physics.
dc.contributor.advisor İnci, Naci.
dc.contributor.author Gökbulut, Belkıs.
dc.date.accessioned 2023-03-16T10:37:13Z
dc.date.available 2023-03-16T10:37:13Z
dc.date.issued 2016.
dc.identifier.other PHYS 2016 G76
dc.identifier.uri http://digitalarchive.boun.edu.tr/handle/123456789/13605
dc.description.abstract In this thesis, an interferometric fiber optic vibration sensor based on a four-core optical fiber is described. When the light is coupled into the four cores, each core acts as a mutually coherent waveguide with the other ones, which allows obtaining an interference fringe pattern at the far field. Vibrating a section of the four-core optical fiber causes a path difference between the light beams guiding in the separate cores, which results in a shift in the fringe pattern. Such a mechanism allows one to relate the fringe shift to the vibration amplitude and frequency. In this study, a source, which is capable to generate 100 Hz frequency sound waves is attached to the optical fiber to maintain vibration of the section of the fiber. A single slit and a photodetector are used to detect the shifting of the fringe pattern that causes a change in the phase of the guiding light. When a He-Ne laser beam is coupled into the optical fiber, the structured fringe pattern is projected onto the slit behind the photodetector, then a small part of the fringe pattern is analysed. Thus, an interferometric fiber optic vibration sensor based on a four-core optical fiber, which has a simple structure and high sensitivity, is accomplished.
dc.format.extent 30 cm.
dc.publisher Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016.
dc.subject.lcsh Optical fibers.
dc.title An interferometric vibration sensor based on a four - core optical fiber
dc.format.pages xii, 44 leaves ;


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