Interferometric refractometer for measuring the relative refractive index of two liquids

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Abstract
An interferometric technique for directly measuring small differences in refractive index between two liquids of similar refractive index is described. The method is based on measuring the phase change on translation normal to the beam propagation in one arm of a Michelson interferometer of a compensating double wedge filled with the two liquids. Details of the sample cell, interferometer construction, signal detection, and experimental procedure are described. Resolution in refractive index difference of 10−6 has been obtained.

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