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Multi-mode fibre laser Doppler anemometer (LDA) with high spatial resolution for the investigation of boundary layers

Multi-mode fibre laser Doppler anemometer (LDA) with high spatial resolution for the... A novel LDA system using laser diode arrays and multi-mode fibers in the transmitting optics is presented. The use of high numerical aperture multi-mode step-index fibres results in measurement volumes with, for example, 80 µm length and minimal speckle effects. Because of the high spatial resolution and low relative fringe spacing variation of Δd/d≈5×10−4 the multi-mode fibre LDA is predestined for investigating turbulent flows. Boundary layer measurements carried out show excellent agreement with theoretical velocity profiles. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Multi-mode fibre laser Doppler anemometer (LDA) with high spatial resolution for the investigation of boundary layers

Experiments in Fluids , Volume 36 (1) – Sep 10, 2003

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References (4)

Publisher
Springer Journals
Copyright
Copyright © 2004 by Springer-Verlag
Subject
Engineering
ISSN
0723-4864
eISSN
1432-1114
DOI
10.1007/s00348-003-0684-z
Publisher site
See Article on Publisher Site

Abstract

A novel LDA system using laser diode arrays and multi-mode fibers in the transmitting optics is presented. The use of high numerical aperture multi-mode step-index fibres results in measurement volumes with, for example, 80 µm length and minimal speckle effects. Because of the high spatial resolution and low relative fringe spacing variation of Δd/d≈5×10−4 the multi-mode fibre LDA is predestined for investigating turbulent flows. Boundary layer measurements carried out show excellent agreement with theoretical velocity profiles.

Journal

Experiments in FluidsSpringer Journals

Published: Sep 10, 2003

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