Journal Article10.1088/0957-0233/18/5/006
An optical fibre interferometric refractometer
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TL;DR: In this article, a double interferometer consisting of an optical fibre Mach-Zehnder interferer and a Michelson interfererer was used to measure the optical path length difference of the moving sample, while the second one measured liquid sample displacement in air.
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Abstract: A new type of optical fibre interferometric refractometer has been made. A double interferometer consists of an optical fibre Mach–Zehnder interferometer and a Michelson interferometer. The first one measures the optical path length difference of the moving sample, while the second one measures the liquid sample displacement in air. A fringe count technique was used on both interferometers in order to obtain the refractive indices of different liquids. The described optical fibre interferometric refractometer was tested by measuring the refractive indices of different liquids, and the achieved results were compared to the results found in the literature. In addition, the refractive index of different concentrations of NaCl in water was measured and compared with the calculated calibration curve. The advantage of the proposed refractometer is high accuracy measurements including the simple construction of the optical fibre Mach–Zehnder interferometer and the commercially available Michelson interferometer.
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Citations
High-resolution and compact refractometer for salinity measurements
TL;DR: In this paper, a compact optical refractometer is presented to improve the measurement of the refractive index of seawater, which is useful in oceanography to calculate density and salinity of oceans from empirical relations.
62
Determining the refractive index of liquids using a modified Michelson interferometer
TL;DR: In this article, an accurate method for measuring the refractive index of liquids is proposed, modeled, and experimentally verified using a modified Michelson interferometer employing a novel liquid chamber that allows the optical pathlength to be continuously varied without moving a mirror.
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Refractive index measured by laser beam displacement at λ=1064 nm for solvents and deuterated solvents.
TL;DR: The refractive index of a liquid is determined with 0.0003 accuracy from measurements of laser beam displacement by a liquid-filled standard 10 mm spectrophotometer cell, with the most important being the curvature of the liquid cell windows.
Refractometer resolution limits for measuring seawater refractive index
Philippe Grosso,Damien Malardé,Marc Le Menn,ZongYan Wu,Jean-Louis de Bougrenet de la Tocnaye +4 more
TL;DR: In this article, the authors present the resolution dependence to refractive index variations, and derive the limits of such a solution for designing seawater sensors based both for coastal and deep sea applications.
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An Experimental Method for Determination of the Refractive Index of Liquid Samples Using Michelson Interferometer
B. Abbas,M. Alshikh Khalil +1 more
TL;DR: In this article, a modified version of the Michelson interferometer employing a rotation stage was used to measure the refractive index of a given liquid or a transparent sample, with an accuracy limited only by the precision in the determination of the rotation angle.
References
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TL;DR: In this article, a new formulation for the experimental refractive index of water and steam from the 1870s to the present is presented for the range of 0.2 to 2.5 μm in wave length, −10 to +500 C in temperature and 0 to 1045 kg m−3 in density.
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Temperature dependence of the refractive indices of liquids: Deviation from the Lorentz-Lorenz formula
D. Beysens,P. Calmettes +1 more
TL;DR: In this article, the authors used a sensitive interferometric device to measure the values of (∂n/∂T)p for 15 different molecular liquids, and gave the corresponding deviations from the values predicted by the Lorentz-Lorenz formula.
94
Refractive-index measurements using an integrated Mach-Zehnder interferometer
TL;DR: In this paper, a refractometer system with an integrated optical sensor is presented, where the sensitive element is a single or multichannel Mach-Zehnder interferometer (MZI) fabricated on silicon using waveguides made from SiO2 and SiON.
52
Grating interferometer with extremely high stability, suitable for measuring small refractive index changes
TL;DR: A grating interferometer with extremely high stability and which can be used as a differential refractometer and which has a long term stability of the order of 1/1500 wavelength over 2 h is described.
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Mach-Zehnder optical system as a sensitive measuring instrument.
TL;DR: A laser interferometric measurement technique that uses a Mach-Zehnder interferometer is developed that permits studies of the physical processes that involve a change in the refractive index with temperature to a high degree of accuracy.
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