Title
Flow characterization using a laser Doppler vibrometer Flow characterization using a laser Doppler vibrometer
Author
Faculty/Department
Faculty of Applied Engineering Sciences
Publication type
article
Publication
Barking ,
Subject
Engineering sciences. Technology
Source (journal)
Optics and lasers in engineering. - Barking
Volume/pages
45(2007) :1 , p. 19-26
ISSN
0143-8166
ISI
000242269500003
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
This paper shows how a scanning laser Doppler vibrometer (LDV), an instrument designed to measure vibrations of structures or objects, can be used in a non-traditional fashion to measure the flow around a cylinder. In particular the von Karmann vortex street which appears in the cylinder wake will be visualized. This is achieved by measuring the changes in the optical path induced by local fluctuation of air refraction index to which the laser vibrometer is sensitive. The measurements obtained with the LDV will be compared visually to measurements done with particle image velocimetry and also with CFD computations for one test case. The specific frequency of the Von Karmann street predicted by the vibrometer, will be compared numerically to the other techniques for two different sized cylinders at three different velocities. (C) 2006 Elsevier Ltd. All rights reserved.
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