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Optical Measurement of Concentration Gradient Near Miscible Interfaces
Author(s) -
RASHIDNIA N.,
BALASUBRAMANIAM R.
Publication year - 2002
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2002.tb05908.x
Subject(s) - thermal diffusivity , interferometry , refractive index , shearing (physics) , measure (data warehouse) , shearing interferometer , optics , optical path length , optical path , laser , materials science , path (computing) , concentration gradient , chemistry , physics , astronomical interferometer , thermodynamics , chromatography , computer science , database , composite material , programming language
A bstract : A common path interferometer (CPI) system was developed to measure the diffusivity of transparent liquid pairs. The CPI is an optical technique that can be used to measure changes in the gradient of refractive index of transparent materials. The CPI is a shearing interferometer that shares the same optical path from a laser light source to the final imaging plane. Molecular diffusivity of liquids can be determined by using physical relations between changes in optical path length and liquid phase properties. In this paper, we present results obtained when the diffusivity depends on the local concentration of the miscible fluids.