ドップラーグローバル流速計の開発研究

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  • ドップラー グローバル リュウソクケイ ノ カイハツ ケンキュウ
  • Development of Doppler Global Velocimetry

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Description

DGV (Doppler Global Velocimetry) is a system to measure velocity of particles crossing a laser sheet, by analyzing the scattered doppler shifted frequency of a light sheet. The light frequency shift is very weak because of the very low speed of the particles compared to the speed of light. In order to overcome this problem, an absorption line of the molecular iodine is used: the absorption of iodine depends strongly on the light frequency going through the iodine vapor. By this mean, it is possible to measure the scattered light intensity going through the iodine and normalize it to the scattered light: this ratio gives us the percentage of light absorbed by the iodine and therefore the doppler shifted frequency. The frequency shift can be traced back to particle velocity.

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