TY JOUR TI The Efficiency of optical systems for measuring of thickness of round timber KW round timber KW optical measurement system KW measurement error KW receiver emitter KW spinduolis JO Actual directions of scientific researches of the XXI century: theory and practice AU Safonov, A.O. AU Platonov, A.D. AU Miltsin, A.N. AU Makarov, G.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov