Abstract
A prototype Raman lidar was designed for monitoring tropospheric
CO<sub>2</sub> profile and other scientific investigations. The third harmonic of
Nd:YAG laser (354.7-nm wavelength) was used as stimulated light source to provide
nighttime measurements. Filter with high rejection ratio performance was used to
extract CO<sub>2</sub> Raman signals from Rayleigh-Mie scattering signals
effectively. To improve the real time monitoring function, a two-channel signal
collection system was designed to collect CO<sub>2</sub> and N2 Raman scattering
signals simultaneously. The N2 Raman scattering signals were used to retrieve
aerosol extinction coefficient. Typical features of CO<sub>2</sub> concentration
profile and aerosol extinction coefficient in Hefei were presented. The mixing ratio
of atmospheric CO<sub>2</sub> in Hefei can reach about 360-400 ppmv.
© 2008 Chinese Optics Letters
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