High-spectral-resolution lidar using an iodine vapor filter at 589 nm

Loren Max Caldwell; Johnathan W. Hair; David A. Krueger; Chiao Yao She

doi:10.1117/12.258165

12 November 1996 High-spectral-resolution lidar using an iodine vapor filter at 589 nm

Loren Max Caldwell, Johnathan W. Hair, David A. Krueger, Chiao Yao She

Proceedings Volume 2833, Application of Lidar to Current Atmospheric Topics; (1996) https://doi.org/10.1117/12.258165
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Simultaneous measurement of aerosol extinction coefficient and atmospheric temperature by a Rayleigh-Mie lidar using an ultranarrow band-stop filter was proposed in 1983. An atomic or molecular vapor is used to separate the Rayleigh and Mie scattering signals which allows the lidar to measure atmospheric state variables (atmospheric temperature and density) as well as optical aerosol properties (aerosol extinction coefficient and backscatter phase function) as a stand alone device. This feasibility was demonstrated by a lidar operated at 537 nm using a barium atomic filter. The achieved temperature measurement uncertainty was about +/- 10 K. The temperature accuracy was limited by the stability of the barium filter oven. To improve measurement accuracy, a lidar based on an iodine vapor filter has been developed. Since iodine vapor pressure is much lower than that of barium, the oven of an iodine filter may be operated at a much lower temperature and therefore controlled to higher precision. The estimated temperature uncertainty of the current lidar system is 2.1 K at present. The temperature uncertainty due to photon noise for a measurement time of 80 minutes is 3 K at 1 km, giving rise to a resulting measurement uncertainty of 3.7 K.

Citation Download Citation

Loren Max Caldwell, Johnathan W. Hair, David A. Krueger, and Chiao Yao She "High-spectral-resolution lidar using an iodine vapor filter at 589 nm", Proc. SPIE 2833, Application of Lidar to Current Atmospheric Topics, (12 November 1996); https://doi.org/10.1117/12.258165

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