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

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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.

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Acknowledgement

The support from the Deutsche Forschungsgemeinschaft (FKZ Cz55/4-4) is greatly acknowledged.

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Authors and Affiliations

  1. Group Laser Metrology, Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 , Hannover, Germany

    L. Büttner & J. Czarske

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  1. L. Büttner
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  2. J. Czarske
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Correspondence to L. Büttner.

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Büttner, L., Czarske, J. Multi-mode fibre laser Doppler anemometer (LDA) with high spatial resolution for the investigation of boundary layers. Exp Fluids 36, 214–216 (2004). https://doi.org/10.1007/s00348-003-0684-z

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  • DOI: https://doi.org/10.1007/s00348-003-0684-z

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