Characterization of axially tilted fibres utilizing a single-shot interference pattern |
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| Affiliation: | 1. Physics Department, Faculty of Science, Mansoura University, Mansoura, Egypt;2. Physics Department, Faculty of Science, Aswan University, Aswan, Egypt;3. BIAS-Bremer Institut für angewandte Strahltechnik, Klagenfurter, Bremen, Germany;1. Department of Industrial Engineering, University of Parma, Italy;2. Department of Physics “Enrico Fermi” and CNISM, University of Pisa, Italy;3. INO-CNR, Pisa, Italy;1. Instituto de Ciencia y Tecnología en Electrónica (ICyTE), Facultad de Ingeniería, Universidad Nacional de Mar del Plata, Juan B. Justo 4302, Mar del Plata, Argentina & CONICET;2. Centro de Investigaciones Ópticas (CONICET-CIC), Centenario y 506, Gonnet, La Plata, Argentina;3. Universidad Nacional de la Plata, Facultad de Ingeniería, Calle 1, 1900, La Plata, Argentina;1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, Fujian, PR China;2. College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou, Zhejiang, PR China;3. Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta, Canada;1. KU Leuven, Department of Materials Engineering, Technology Campus Diepenbeek, Wetenschapspark 27, B-3590, Diepenbeek, Belgium;2. KU Leuven, Department of Materials Engineering, Technology Campus De Nayer Sint-Katelijne-Waver, Jan de Nayerlaan 5, B-2860, Sint-Katelijne-Waver, Belgium;1. School of Computer Science and Engineering, Xi''an University of Technology, Xi''an 710048, China;2. Shannxi Province Key Lab of Thin Film Technology and Optical Test, Xi''an Technological University, Xi''an 710048, China;1. Division of Fluid and Experimental Mechanics, Luleå University of Technology, 971 87 Luleå, Sweden;2. Department of Civil and Transport Engineering, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway |
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| Abstract: | We proposed a method to solve the problem of extracting meaningful phase information for a single-shot interference pattern taken for an axially tilted fibre sample. Conventionally such interference patterns can be not evaluated with appropriate accuracy. Here, such an interference pattern is considered to be a special hologram since it contains information about light propagated through a laterally fixed sample located at different axial planes. Thus, part of the test object in such a hologram is in focus and the other parts are out of focus. The proposed method can be considered as two complementary steps. In the first step the complex amplitude across the hologram plane is recovered using an adaptive spatial carrier frequency method. This is followed by the second step where the complex amplitude is numerically propagated within a given volume. Thus, planes where the test object is in focus are defined. Consequently, the phase distributions corresponding to all of these planes are together stitched. Thus a complete focus phase map for the fiber sample under test is obtained. From the obtained phase map the two dimensions refractive and the two dimensions birefringence of isotactic polypropylene fibre were calculated. |
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| Keywords: | Fibre characterization Digital holography |
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