Research of optical density influence of flowing liquid to measurement error of the refractive index by refractometer of differential type

Factors that are affected the influence of the measurement error of the refractive index $n$ in the flowing liquid (change in its optical density and temperature) are established. A during the using a differential flow type refractometer for measuring $n$ flowing fliquid on the error in measuring the refractive index is additionally influenced by the scattering of radiation in the cell transducer and the wedge-shaped glass of the cell. New design of a differential refractometer for investigation of the optical density influence of the flowing liquid on the measurement error $n$ is developped. New results confirming the influence of changes in the optical density of the flowing liquid on the measuring error of the refractive index $n$ are recived. Compensation technique of the changes influence a optical density on the measurement error $n$ is offered.