R.V. Litovkin

E.O. Ariskin - Post-graduate Student, Department «Devices and information-measuring systems», Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI) A.V. Nikitin - Ph.D. (Eng.), Assistant, Department «Devices and information-measuring systems», Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI). E-mail: nikitin.rf@mail.ru V.V. Soldatkin - Dr. Sc. (Eng.), Associate Professor, Department «Devices and information-measuring systems», azan National Research Technical University named after A.N. Tupolev (KNRTU-KAI) V.M. Soldatkin - Dr. Sc. (Eng.), Professor, Head of Department «Devices and information-measuring systems», Kazan National Research Technical University named after A.N. Tupolev (KNRTU-KAI). E-mail: w-soldatkin@mail.ru