Double domain wavelength multiplexed Fizeau interferometer with high resolution dynamic sensing and absolute length detection |
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| Institution: | 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. 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;1. Departamento de Teoría de la Señal y Comunicaciones, Universidad Politécnica de Madrid, Campus Sur, Madrid, 28031, Spain;2. Dipartimento di Ingegneria, Universitá Roma Tre, Rome, Italy;3. Departamento de Óptica, Universidad Complutense de Madrid, Madrid 28040, Spain;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 |
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| Abstract: | In this work, we present a simple photonic instrument that has the ability of measuring positions, distances and vibrations with very high resolution by means of two Fizeau interferometers (FI), both using the same optical fiber end as a probe tip itself. On the one hand we have a time domain FI powered with a 1310 nm laser and monitored by an InGaAs detector providing displacement information with resolution around a tenth of nm but regardless of the absolute position of object and of the displacement sense. On the other, a spectral domain FI version based on a super luminescent source (SLED) centred at 800 nm with bandwidth of nearly 40 nm is analysed in real time by means of a digital spectrometer. Each spectrum is acquired in a very small time interval and provides information of both length of the cavity as well as its correct sense of evolution. Resolution of this system is lower than its complementary temporal case, but distance and sense measurements are absolute and can be determined successfully by adequate processing of spectral signal.Both interferometers are optically coupled to a single fiber optic probe and are wavelength modulated.Therefore, combination of both sensors results in a new one which allows the correct knowledge of an object or surfaces under test, i.e. a high resolution of displacement data plus its absolute position and true sense of movement. |
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| Keywords: | Fiber optics sensor Fizeau interferometer Spectral interferometer Temporal spectrometer |
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