Measurement of Slant Visual Range in Laser Radar Operation Considering the Spread of Transmitted Laser Beam Caused by Small Particles in the Atmosphere

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概要

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• In bad weather conditions, e.g. rainy, foggy, and snowy conditions, exact slant visual ranges should be obtained for safe landings at airports. However, no equipment for achieving this has been installed in airports yet. In this study, the laser radar system is refined for estimating the slant visual range. It is found that the empirical data in bad weather conditions do not correspond to predictions with the current laser radar equation. Therefore, a new laser radar equation, which considers the divergence of the transmitting laser beam, is proposed. The slopes of this equation correspond well to the empirical data in various weather conditions. The visibilities estimated by this equation also correspond with those obtained by the slant transmittance system, Also, the extent of the divergence is examined by means of classifying the empirical data by weather conditions. As a result, it is found that the divergence of the transmitted laser beam increases in the order of rain, fog, misty rain, and snow.

• 社団法人照明学会の論文

著者

• Ikeda Kazuho

  Department Of Biological Sciences Graduate School Of Science University Of Tokyo

• Ikeda K

  Osaka City Univ. Osaka Jpn

• Ikeda Koichi

  Tokyo Rika Daigaku

• Ikeda K

  Tokyo Rika Daigaku Dept. Electri. Engng. Fac. Sci. Tech.

• Shiina Tatsuo

  Tokyo Rika Daigaku

• Shiina T

  Tokyo Rika Daigaku

• Ikeda Koichi

  Tokyo Rika Daigaku Department Of Electrical Engineering Faculty Of Science And Technology

• Ikeda Koichi

  Faculty Of Science And Engineering Tokyo Rikadaigaku (science University Of Tokyo)

• Ikeda Koichi

  Tokyo Rika Daigaku Dept.electri.engng. Fac.sci.tech.

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