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Optical guidelines and signal quality for LDA applications in circular pipes

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Abstract

The optical performance of laser Doppler anemometer (LDA) technology in applications to circular pipes with an external plane wall has been clarified and quantified. It is shown that optical aberration is a persistent feature in such LDA measurements and measurements from each direction along a full pipe diameter are needed to obtain the flow distribution. For measurements of axial velocities in a circular pipe no special care has to be taken, even if the optical plane deviates from the pipe axis. For measurements of tangential and radial velocities detailed operating guidelines have been presented with respect to the shift of the measurement volume, its optical properties and the beam waist dislocations. The analysis reveals the possible influences on both the signal quality and the measurement accuracy.

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Acknowledgement

The present work originated during an experimental measurement campaign for an industrial project named by JET, which aims to investigate the free surface jet in Pelton turbines. The author greatly thanks PSEL (Fund for Projects and Studies of the Swiss Electric Utilities) and Sulzer Markets & Technology for their financial support.

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  1. Zh. Zhang

    Present address: Faculty of Science and Technology, University of Applied Sciences Aargau, 5210, Windisch, Switzerland

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  1. Sulzer Innotec, 8401, Winterthur, Switzerland

    Zh. Zhang

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  1. Zh. Zhang
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Correspondence to Zh. Zhang.

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Zhang, Z. Optical guidelines and signal quality for LDA applications in circular pipes. Exp Fluids 37, 29–39 (2004). https://doi.org/10.1007/s00348-004-0781-7

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  • DOI: https://doi.org/10.1007/s00348-004-0781-7

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