30 April 1993 Refractive index measurement with optical fiber Mach-Zehnder interferometer
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An interferometric technique for determination of the refractive index of liquids is described. The method is based on measurements of phase variations caused by the relative movement of an optical fiber tip in a liquid sample. The apparatus consists of two independent interferometers. A two-frequency Michelson interferometer is used to measure the liquid sample displacement in the air, while an optical fiber Mach-Zehnder interferometer measures the optical path length difference in the moving sample. The liquid sample refractive index is then derived by dividing the fringe counts obtained by both interferometers. The measurements have been performed in different liquids. With the distilled water sample, the statistical error of this method was found to be 5 X 10-5.
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Alojz Suhadolnik, Ales Babnik, Janez Ivan Mozina, "Refractive index measurement with optical fiber Mach-Zehnder interferometer", Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); doi: 10.1117/12.143554; https://doi.org/10.1117/12.143554

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