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Single-camera Doppler global velocimetry based on frequency modulation techniques

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Abstract

The main advantage of the described Doppler global velocimeter (DGV) systems based on frequency modulation (FM) or frequency shift keying (FSK) is that no reference detector is required. The frequency variation of the laser light during one modulation period additionally allows an on-line calibration of the complete DGV system. Thus, the new method has the potential to reduce the uncertainty of conventional DGV velocity measurements since time resolved velocity field measurements on a spinning disc have shown standard deviations down to 0.02 m/s. On investigating flow fields, velocity components notably less than 0.5 m/s were resolved.

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Acknowledgments

We would like to thank the Deutsche Forschungsgemeinschaft (DFG) for the support of the project within the framework of the SPP 1147.

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Authors and Affiliations

  1. Department Gas Flow 1.4, Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116, Braunschweig, Germany

    Harald Müller & Michael Eggert

  2. Department of Electrical Engineering and Information Technology, TU Dresden, Helmholtzstraße 18, 01069, Dresden, Germany

    Jürgen Czarske, Lars Büttner & Andreas Fischer

Authors
  1. Harald Müller
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  2. Michael Eggert
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  3. Jürgen Czarske
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  4. Lars Büttner
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  5. Andreas Fischer
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Corresponding author

Correspondence to Harald Müller.

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Müller, H., Eggert, M., Czarske, J. et al. Single-camera Doppler global velocimetry based on frequency modulation techniques. Exp Fluids 43, 223–232 (2007). https://doi.org/10.1007/s00348-007-0353-8

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  • DOI: https://doi.org/10.1007/s00348-007-0353-8

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