Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back The Use of Refractometry to Ensure the Pre-Flight Preparation of Aircraft YU.YU. MIKHALCHEVSKY, G.A. KOSTIN, E.E. MAIOROV, A.V. AREFIEV, R.B. GULIYEV, A.V. DAGAEV This article to the application of refractometric technologies based on the method of full internal reflection to ensure the preflight preparation of aircraft is devoted. The paper a study of ethylene glycol, propylene glycol and their aqueous solutions, which make up 99 % of the deicing liquid are presented. The developed refractometer is shown, which provided measurement of the refractive index of solutions in the concentration range k = 0 ... 60 % at a temperature T = 25 °C at a wavelength λ = 589 nm. Errors in determining the concentration of k(n) in solutions at T = 25 °C with a value of Δn = 0,0004 and Δk = 0,4% were determined, which fully meets the requirements of practical refractometry and the use of a submersible refractometric device at airport posts for preflight training of aircraft. Keywords: wavelength, refractive index, antiicing liquid, measurement error, measurement range, data convergence, aircraft. DOI: 10.25791/pribor.10.2021.1294 Pp. 01-07.