Determination of refractive indices of liquids by Fresnel diffraction |
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| Authors: | Arash Sabatyan Mohammad Taghi Tavassoly |
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| Institution: | 1. Physics Department, Faculty of Sciences, Urmia University, P.O. Box 165, Urmia, Iran;2. Institute for Advanced Studies in Basic Sciences, P.O. Box 45195-1159, Zanjan, Iran;3. Physics Department, University of Tehran, Kargar Shomally, Tehran, Iran;1. Process Instruments (UK) Ltd, March Street, Burnley, BB12 0BT, UK;2. School of Chemistry, University of Birmingham, Birmingham, B15 2TT, UK;1. Centro de Investigaciones en Óptica A. C. Loma del Bosque 115, Colonia Lomas del Campestre León, Guanajuato, México, C. P. 371506, Mexico;2. Centro Nacional de Metrología. km 4.5 Carretera a Los Cués , Municipio El Marqués, Querétaro., México, C.P. 76246, Mexico |
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| Abstract: | We demonstrate an easy, reliable, applicable, and sensitive method to measure refractive index of liquids by using Fresnel diffraction. In this method a cylindrical glass rod, in general, or an optical fiber in special case, is immersed into a liquid. Physical parameters of the rod, like radius and refractive index, should be well known. Then, the normalized intensity distribution on the Fresnel diffraction pattern of a plane wave diffracted from the immersed fiber is measured. Thereafter, refractive index of the liquid is evolved by the least-square method. This method applied to determine the refractive index of four liquids; pure water, 2-propanol (isopropanol), acetone and methanol. Index of refraction of each one has been acquired for four visible wavelengths. A theoretical approach and experimental results is presented. |
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