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Proceedings Paper

Development of a dual-wavelength high-spectral-resolution lidar
Author(s): Tomoaki Nishizawa; Nobuo Sugimoto; Ichiro Matsui
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Paper Abstract

A two-wavelength (532 and 355nm) High-Spectral-Resolution Lidar (HSRL) system for the next-generation aerosol-monitoring lidar network is being developed. Depolarization measurement functions at two wavelengths (532 and 1064nm) have been added to this lidar system. This lidar system provides 2α+3β+2δ data: extinction coefficients (α) at 355 and 532nm; backscatter coefficients (β) at 355, 532, and 1064nm; and depolarization ratios (δ) at 532 and 1064nm. This system combines use of previously developed HSRL techniques with an iodine absorption filter for 532nm and a Fabry-Perot etalon for 355nm. A 532nm HSRL and 1064nm receiver were constructed for this lidar. We also developed a system to automatically tune the laser wavelength of this lidar to an iodine absorption line. We conducted preliminary measurements using the constructed systems. The temporal and vertical variation of aerosols could be determined. The constructed 532nm HSRL could measure molecule Rayleigh backscatter signals, indicating that the developed laser wavelength tuning system worked well. We further are developing an algorithm to retrieve the vertical distributions of the concentration and particle sizes of black carbon, dust, sea salt, and a mixture of sulfate, nitrate, and organic carbon, which are the principal aerosol components in the atmosphere, using the 2α+3β+2δ data.

Paper Details

Date Published: 11 November 2010
PDF: 12 pages
Proc. SPIE 7860, Lidar Remote Sensing for Environmental Monitoring XI, 78600D (11 November 2010); doi: 10.1117/12.870068
Show Author Affiliations
Tomoaki Nishizawa, National Institute for Environmental Studies (Japan)
Nobuo Sugimoto, National Institute for Environmental Studies (Japan)
Ichiro Matsui, National Institute for Environmental Studies (Japan)

Published in SPIE Proceedings Vol. 7860:
Lidar Remote Sensing for Environmental Monitoring XI
Upendra N. Singh; Kohei Mizutani, Editor(s)

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