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Imaging laser Doppler velocimetry

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Abstract

Imaging laser Doppler velocimetry (ILDV) is a novel flow measurement technique, which enables the measurement of the velocity in an imaging plane. It is an evolution of heterodyne Doppler global velocimetry (HDGV) and may be regarded as the planar extension of the classical dual-beam laser Doppler velocimetry (LDV) by crossing light sheets in the flow instead of focused laser beams. Seeding particles within the flow are illuminated from two different directions, and the light scattered from the moving particles exhibits a frequency shift due to the Doppler effect. The frequency shift depends on the direction of the illumination and the velocity of the particle. The superposition of the two different frequency-shifted signals on the detector creates interference and leads to an amplitude modulated signal wherein the modulation frequency depends on the velocity of the particle. This signal is detected using either a high-speed camera or alternatively a smart pixel imaging array. This detector array performs a quadrature detection on each pixel with a maximum demodulation frequency of 250 kHz. To demonstrate the feasibility of the technique, two experiments are presented: The first experiment compares the measured velocity distribution of a free jet using ILDV performed with the smart pixel detector array and a high-speed camera with a reference measurement using PIV. The second experiment shows an advanced setup using two smart pixel detector arrays to measure the velocity distribution on a rotating disk, demonstrating the potential of the technique for high-velocity flow measurements.

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References

  • Ainsworth RW, Thorpe SJ, Manners RJ (1997) A new approach to flow-field measurement: a view of Doppler global velocimetry techniques. Int J Heat Fluid Flow 18:116–130

    Article  Google Scholar 

  • Beer S, Seitz P (2005) Real-time tomographic imaging without X-rays: a smart pixel array with massively parallel signal processing for real-time optical coherence tomography performing close to the physical limits. Research in microelectronics and electronics 2005 PhD, vol 2, pp 135–138

  • Beutner TJ, Elliott GS, Mosedale A, Carter C (1998) Doppler global velocimetry applications in large scale facilities. In: AIAA 20th advanced measurement and ground testing conference, AIAA paper 98–2608

  • Elliott GS, Beutner TJ (1999) Molecular filter based planar Doppler velocimetry. Prog Aerosp Sci 35:799–845

    Article  Google Scholar 

  • Ghiglia DC, Romero LA (1994) Robust two-dimensional weighted and unweighted phase unwrapping that uses fast transforms and iterative methods. J Opt Soc Am A 11:107–117

    Article  Google Scholar 

  • Landolt A, Roesgen T (2009) Global Doppler frequency shift detection with near-resonant interferometry. Exp Fluids 47(4–5):733–743

    Article  Google Scholar 

  • Meier AH, Roesgen T (2009) Heterodyne doppler global velocimetry. Exp Fluids 47(4–5):665–672

    Article  Google Scholar 

  • Miller KS, Rochwarger MM (1972) A covariance approach to spectral moment estimation. IEEE Trans Info Theory 18:588–596

    Article  MathSciNet  MATH  Google Scholar 

  • Roehle I, Schodl R, Voigt P, Willert C (2000) Recent developments and applications of quantitative laser light sheet measuring techniques in turbomachinery components. Meas Sci Technol 11:1023–1035

    Article  Google Scholar 

  • Samimy M, Wernet MP (2000) Review of planar multiple-component velocimetry in high-speed flows. AIAA J 38:553–574

    Article  Google Scholar 

  • Smith MW, Drummond JP, Northam GB (1996) Application of absorption filter planar Doppler velocimetry to sonic and supersonic jets. AIAA J 34:434–441

    Article  Google Scholar 

  • vom Stein HD, Pfeiffer HJ (1969) A Doppler difference method for velocity measurements. Metrologia 5:59–61

    Article  Google Scholar 

  • Yeh Y, Cummins HZ (1964) Localized fluid flow measurements with an He–Ne laser spectrometer. Appl Phys Lett 4:176

    Article  Google Scholar 

Download references

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Authors and Affiliations

  1. Institute of Fluid Dynamics, ETH Zurich, Sonneggstrasse 3, 8092, Zurich, Switzerland

    Alexander H. Meier & Thomas Roesgen

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  1. Alexander H. Meier
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  2. Thomas Roesgen
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Correspondence to Alexander H. Meier.

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Meier, A.H., Roesgen, T. Imaging laser Doppler velocimetry. Exp Fluids 52, 1017–1026 (2012). https://doi.org/10.1007/s00348-011-1192-1

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  • DOI: https://doi.org/10.1007/s00348-011-1192-1

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