20.500.12556/RUL-128815 Determination of refractive index, size, and solid content of monodisperse polystyrene microsphere suspensions for the characterization of optical phantoms Monodisperse polystyrene microspheres are often utilized in optical phantoms since optical properties such as the scattering coefficient and the scattering phase function can be calculated using the Mie theory. However, the calculated values depend on the inherent physical parameters of the microspheres which include the size, refractive index, and solid content. These parameters are often provided only approximately or can be affected by long shelf times. We propose a simple method to obtain the values of these parameters by measuring the collimated transmission of polystyrene microsphere suspensions from which the wavelength-dependent scattering coefficient can be calculated using the Beer-Lambert law. Since a wavelength-dependent scattering coefficient of a single suspension is insufficient to uniquely derive the size, refractive index and solid content by the Mie theory, the crucial and novel step involves suspending the polystyrene microspheres in aqueous sucrose solutions with different sucrose concentrations that modulates the refractive index of the medium and yields several wavelength-dependent scattering coefficients. With the proposed method, we are able to obtain the refractive index within 0.2% in the wavelength range from 500 to 800 nm, the microsphere size to approximately 15 nm and solid content within 2% of their respective reference values. forward scattering Mie theory multiple scattering refractive index scattering measurement usmerjeno sipanje teorija Mie večkratno sipanje lomni količnik meritve sipanja true false true Angleški jezik Slovenski jezik V članku navedeno: "© 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement"; s povezavo https://www.osapublishing.org/library/license_v1.cfm. (3. 8. 2021) Članek v reviji 2021-08-03 11:06:39 2021-08-03 11:06:40 2023-05-30 03:27:11 0000-00-00 00:00:00 2020 0 0 Str. 1901-1918 no. 4, art. 387619 Vol. 11 1 Apr. 2020 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 535 2156-7085 10.1364/BOE.387619 12953940 RAZ_Naglic_Peter_2020.pdf RAZ_Naglic_Peter_2020.pdf 1 0BD3C12C6B7F78D8F536EE5C8695F39C 7aa284a771d36f45903bb29dbc09c75b70d59060020f64b0f49c559d6797ec3b 151e76a6-f43a-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145702 https://www.osapublishing.org/boe/fulltext.cfm?uri=boe-11-4-1901&id=428923 0 f251d7d3-f439-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145701 Fakulteta za elektrotehniko 0 0 0