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Optical Engineering

High-spectral-resolution lidar using an iodine absorption filter for atmospheric measurements
Author(s): Zhaoyan Liu; Ichiro Matsui; Nobuo Sugimoto
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Paper Abstract

We develop high-spectral-resolution lidar (HSRL) using an iodine absorption filter and a narrow-band Nd:YAG laser with high- frequency-doubled output and use it for atmospheric measurements at the National Institute for Environmental Studies (NIES). The lidar system separates Doppler-broadened molecular scattering and unbroadened aerosol scattering components of the backscattered laser light, consequently providing direct measurements of these two signals. Due to stable and strong absorption at room temperature, iodine absorption filters are easy to use and they enable high rejection against aerosol scattering with a short length. The measurement principle with an error analysis and the system construction of the HSRL are described. Examples of aerosol and cloud observations made by the HSRL are also presented. The experimental results indicate that the HSRL is a powerful tool for quantitatively measuring aerosol and cloud optical properties. The use of a high-output laser gives our system the ability to provide stratospheric observations. We also present the HSRL measurements of the stratospheric temperature and backscatter profiles with better resolutions in both range and time. An example of temperature and backscatter measurements is shown for the altitude range from ~`10 to ~40 km with a vertical resolution of 300 m and an integrated time of ~2 h.

Paper Details

Date Published: 1 October 1999
PDF: 10 pages
Opt. Eng. 38(10) doi: 10.1117/1.602218
Published in: Optical Engineering Volume 38, Issue 10
Show Author Affiliations
Zhaoyan Liu, National Institute for Environmental Studies (Japan)
Ichiro Matsui, National Institute for Environmental Studies (Japan)
Nobuo Sugimoto, National Institute for Environmental Studies (Japan)


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