Development of a Rotational Raman Laser Radar for Remote Atmospheric Telnperature Profiling

摘要

For measuring atmospheric temperature profiles in the lower troposphere，a rotationa1 Raman Laser Rader (lidar) was developed. For high sensitive rotational Ramanscattering measurements，the double grating polychromator was designed and a highMie rejection ratio over 3 x 106 was obtained with a high overall transmittance of 39%.Using a second harmonic beam of the Nd:YAG laser，random error of the temperaturemeasurement due to signal-to-noise ratio was reduced to土0.5 K at a height of 1 km.Comparisons were made with radiosonde profile data and the result showed good agreement.Various systematic errors were analyzed and reduced by careful system analysis.