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.
KeywordsBackscatter Signal Slave Laser Master Laser Height Resolution Dial System
Unable to display preview. Download preview PDF.
- 1.O’C. Starr, D., Melfi S. H, The role of water vapor in climate. Nasa Conference Publication 3120 (1991)Google Scholar
- 3.Wulfmeyer, V., Bösenberg, J.: Single-mode operation of an injection-seeded alexandrite ring laser for application in water-vapor and temperature differential absorption lidar. Accepted for publication in Opt. Lett.Google Scholar
- 4.Wulfmeyer, V.: DIAL-Messungen von vertikalen Wasserdampfverteilungen. Thesis University of Hamburg 1995Google Scholar
- 5.Bösenberg, J.: Doppler broadening of Rayleigh backscatter: How important is it for water-vapor and temperature DIAL? 18th International Laser Radar Conference Berlin Germany (1996)Google Scholar