Measurement of Particle Size Distribution of Ambient Aerosol by Bistatic Lidar System

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  • バイスタティックライダによる大気エアロゾルの粒径分布の測定

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Abstract

A new analytical system to determine the size distribution of atmospheric aerosols, which includes optical constant, was developed and applied to the measurement of the size distribution of mist and ambient aerosols. The scattered light was measured with a bistatic lidar system using an 8 wavelength laser beam as the light sources at a 179 degree scattering angle. The particle size distributions of those two types of atmospheric aerosols were estimated using the singular value decomposition (SVD) from the scattered light. The method successfully retrieved the size distribution in the case of mist for which the imaginary part of refractive index was set at 0.001 rather than 0.0 and the wavelength dependence of the real part was included. The size distribution of the mist was inverted to the log-normal distribution, and the size distribution of the ambient aerosol particle to the Junge distribution, when the real part of refractive index was fixed at 1.5 and the imaginary part at 0.001 or 0.0. This method was able to discriminate the size distributions of mist and ambient aerosols.

Journal

  • Earozoru Kenkyu

    Earozoru Kenkyu 14 (2), 111-118, 1999

    Japan Association of Aerosol Science and Technology

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