TY JOUR TI MATHEMATICAL MODELING OF AN OPTICAL-PYROMETRIC GAS ANALYZER KW quantitative analysis KW substance concentration KW gas analyser KW optical-pyrometric gas analyser KW mathematical model KW static characteristic KW uncertainty JO Siberian Fire and Rescue Bulletin AU Garelina, S.A. AU Zakharyan, R.A. AU Latyshenko, K.P. PY 2025 IS 2025 PB FSBEE HE Siberian Fire and Rescue Academy EMERCOM of Russia