Development of a dual-wavelength high-spectral-resolution lidar

Tomoaki Nishizawa; Nobuo Sugimoto; Ichiro Matsui

doi:10.1117/12.870068

11 November 2010 Development of a dual-wavelength high-spectral-resolution lidar

Tomoaki Nishizawa, Nobuo Sugimoto, Ichiro Matsui

Proceedings Volume 7860, Lidar Remote Sensing for Environmental Monitoring XI; 78600D (2010) https://doi.org/10.1117/12.870068
Event: SPIE Asia-Pacific Remote Sensing, 2010, Incheon, Korea, Republic of

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.

Citation Download Citation

Tomoaki Nishizawa, Nobuo Sugimoto, and Ichiro Matsui "Development of a dual-wavelength high-spectral-resolution lidar", Proc. SPIE 7860, Lidar Remote Sensing for Environmental Monitoring XI, 78600D (11 November 2010); https://doi.org/10.1117/12.870068

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