Development a Mobile Differential Refractometer for Express Control of Liquid Medium State with Refractive Index Measuring Range from 1.23 to 2.63

The necessity of developing a mobile differential refractometer to solve problems of express control of the state of liquid media and their mixtures in real time is substantiated. To expand the functionality of using the developed mobile differential refractometer, its design provides a mode for measuring the refractive index of a liquid medium from 1.23 to 2.63 with an error of 0.0001. This n measurement range includes all liquid media existing in the world and their mixtures. This measurement range n is not available to other models of small-sized and mobile refractometers for express control. To implement control of the n value in the range from 1.23 to 2.63, a new measurement method was developed. Researches of various environments were carried out, which confirmed the adequacy of our development.