TY CONF TI COMPARISON OF CALIBRATION RESULTS OF PHOTOACOUSTIC GAS ANALYZERS BASED ON CO2 LASERS KW optical-acoustic gas analyzers KW calibration KW laser JO The XXXI International Symposium "Atmospheric and Ocean Optics. Atmospheric Physics" AU Ageev, B.G. AU Nikiforova, O.Y. AU Ponomarev, Y.N. PY 2025 PB V.E. Zuev Institute of Atmospheric Optics, Siberian Branch of the Russian Academy of Sciences