Andreev O. Fiber-optic and interference elements application in the correlation spectroscopy

Object - elastic and quasielastic light scattering processes in randomly inhomogeneous fluids. Objective - to establish and justify the application possibilities of interference elements and capillary/fiber light guides for in-situ determining static and dynamic characteristics of the light scattered by the liquid solution in real time. Methods - dynamic light scattering, measurement errors matrix calculation method, the study of algorithms for processes approximation and modeling in running wave interferometer (RWI). Results - it was shown that the use of single-mode fiber optic sensors provides in-situ measurement of scattered by nanoparticles light properties in real time, including that of during their synthesis in chemical reactors. It was established that the increase in turbulent diffusion leads to a decrease in the measured nanoparticles radius. The use of capillary fibers to eliminate turbulence in the test environment was experimentally justified. The scheme of anisotropic reactor with integrated optical sensors was developed. Optical filtering and high-frequency amplitude signal modulation in RWI was extensively studied. Scope - nanophysics, optics, biophysics, medicine, fluid dynamics