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Instruments and Systems: Monitoring, Control, and Diagnostics Annotation << Back
Remote fiber laser gas analyzer – lidar for monitoring methane in the atmosphere |
G.A. AKIMOVA, V.I. GRIGORIEVSKY, YU.P. SYRICH, V.P. SADOVNIKOV, YA.A. TEZADOV, A.V. FEDENEV
The results of methane concentration measurements on extended horizontal and vertical paths in the Earth’s atmosphere are presented, wich are obtained using a laser remote gas analyzer based on a two-stage Raman amplifier with an output power of about 3 W in a quasicontinuous mode and on a linear-requency modulated laser with distributed feedback. An empirical expression of the weight function is obtained for the anomalous gas distribution with a concentration maximum at an altitude of ~ 700 meters and an anomalously low concentration at altitudes above 1000 meters. This distribution is in good agreement with the experimental data obtained for the situational plan with additional sources of methane emissions. During the measurements, a water absorption line was detected, which strongly depends on the humidity of the atmosphere and can be used to clarify weather data and the ecological situation.
Keywords: gas analyzer, Raman amplifier, laser, methane, atmosphere.
DOI: 10.25791/pribor.06.2019.691
Contacts: E-mail: vig248@ire216.msk.su
Pp. 16-22. |
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