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NAOSITE : Nagasaki University's Academic Output SITE > Faculty of Engineering > Bulletin > Reports of the Faculty of Engineering, Nagasaki University > Volume 34, No. 63 >


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Title: ドップラーグローバル流速計の開発研究
Other Titles: Development of Doppler Global Velocimetry
Authors: 坂口, 大作
Authors (alternative): Sakaguchi, Daisaku / Bagnera, Carlo
Issue Date: Jul-2004
Citation: 長崎大学工学部研究報告 Vol.34(63) p. 17-24, 2004
Abstract: 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.
Keywords: laser velocimetry / planner measurement / doppler signal / molecular iodine
URI: http://hdl.handle.net/10069/15078
ISSN: 02860902
Type: Departmental Bulletin Paper
Appears in Collections:Volume 34, No. 63

Citable URI : http://hdl.handle.net/10069/15078

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