A.A. Kuznetsov - Candidate of Physics and Mathematics, Associate Professor, Department of General and Applied Physics, Vladimir State University AG and NG Stoletovs. E-mail: artemi-k@mail.ru
N.N. Kiselev - a graduate student, a senior lecturer in medical electronics, St. Petersburg State University of Aerospace Instrumentation (SUAI) E-mail: kiselev.n@bk.ru
V.G. Gumennyy - student, Department of General and Applied Physics, Vladimir State University. AG and NG Stoletovs