Single—Mode All—Solid—State Water—Vapor and Temperature DIAL System
An all—solid—state DIAL system is introduced which produces single—mode laser pulses with a frequency stability of 15 MHz rms and a bandwidth of < 40 MHz. The high performance of this DIAL system makes narrow—band detection of the backscatter signal possible in order to avoid errors caused by Doppler broadening of the backscatter signal.
Water—vapor measurements are presented and analyzed. An error of < 5% in the whole troposphere caused by laser properties can be specified. The statistical error is < 0.16 g/m3 at a height resolution of 75 m and a time resolution of 1 min up to 2 km. Accordingly this system is suitable for water—vapor flux measurements in the convective boundary layer. Precise measurements of water—vapor profiles in the whole troposphere during day- and nighttime are now possible.
KeywordsRadar Sapphire Remote Sensing Lidar Dial
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