| タイトル | Development of Point Doppler Velocimetry for Flow Field Investigations |
| 本文（外部サイト） | http://hdl.handle.net/2060/20060023984 |
| 著者（英） | Meyers, James F.; Lee, Joseph W.; Cavone, Angelo A. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2006-05-01 |
| 言語 | eng |
| 内容記述 | A Point Doppler Velocimeter (pDv) has been developed using a vapor-limited iodine cell as the sensing medium. The iodine cell is utilized to directly measure the Doppler shift frequency of laser light scattered from submicron particles suspended within a fluid flow. The measured Doppler shift can then be used to compute the velocity of the particles, and hence the fluid. Since this approach does not require resolution of scattered light from individual particles, the potential exists to obtain temporally continuous signals that could be uniformly sampled in the manner as a hot wire anemometer. This leads to the possibility of obtaining flow turbulence power spectra without the limitations of fringe-type laser velocimetry. The development program consisted of a methodical investigation of the technology coupled with the solution of practical engineering problems to produce a usable measurement system. The paper outlines this development along with the evaluation of the resulting system as compared to primary standards and other measurement technologies. |
| NASA分類 | Fluid Mechanics and Thermodynamics |
| レポートNO | Paper-1020 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
