An optical technique is described that determines the path-averaged value of a refractive-index structure parameter at 10.6 μm by use of a pulsed coherent CO2 lidar in direct detection and hard-target returns. The lidar measurements are compared with measurements taken by a 0.9-μm scintillometer and temperature probe (with humidity corrections). The experimental results show good agreement for Cn2 ≥ −14 m−2/3. With respect to practical applications the new technique permits Cn2 lidar measurements in a neutral meteorological situation to an unstably stratified convective boundary layer over long ranges (1 km or more).
© 1999 Optical Society of America
(010.3640) Atmospheric and oceanic optics : Lidar
(010.7060) Atmospheric and oceanic optics : Turbulence
(030.1640) Coherence and statistical optics : Coherence
(030.6140) Coherence and statistical optics : Speckle
(120.5710) Instrumentation, measurement, and metrology : Refraction
Philippe Drobinski, Alain M. Dabas, Patricia Delville, Pierre H. Flamant, Jacques Pelon, and R. Michael Hardesty, "Refractive-Index Structure Parameter in the Planetary Boundary Layer: Comparison of Measurements Taken with a 10.6-μm Coherent Lidar, a 0.9-μm Scintillometer, and In Situ Sensors," Appl. Opt. 38, 1648-1656 (1999)