Image processing for interferometric Mie and Rayleigh scattering velocity measurements

D. Bivolaru, M. V. Ötügen, Antonios Tzes, G. Papadopoulos

    Research output: Contribution to journalArticle

    Abstract

    An image-processing method that is used in conjunction with a Fabry-Perot interferometer has been developed for time-resolved local velocity measurements in gas flows. The processing method is used to determine the Doppler shift in Mie or Rayleigh scattered light from the measurement volume. The method minimizes the adverse effects due to the drifting of laser frequency and interferometer alignment. The scattered light is mixed with unshifted light from the interrogation laser for reference before it is passed through the interferometer. The concentric, double-ring pattern images (from both the signal and the reference light) formed at the output of the interferometer are captured by a charge-coupled device camera and analyzed for free spectral range and Doppler shift simultaneously using an autocorrelation technique. Measurements have been made in the near field of a Mach 1.6 supersonic jet to determine the structure of the velocity field. Velocity data obtained using the present image analysis technique has been compared with those obtained using a direct analysis method in the same jet.

    Original languageEnglish (US)
    Pages (from-to)688-694
    Number of pages7
    JournalAIAA Journal
    Volume37
    Issue number6
    DOIs
    StatePublished - Jan 1 1999

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    Rayleigh scattering
    Velocity measurement
    Image processing
    Interferometers
    Doppler effect
    Fabry-Perot interferometers
    Volume measurement
    Lasers
    CCD cameras
    Autocorrelation
    Image analysis
    Mach number
    Flow of gases
    Processing

    ASJC Scopus subject areas

    • Aerospace Engineering

    Cite this

    Bivolaru, D., Ötügen, M. V., Tzes, A., & Papadopoulos, G. (1999). Image processing for interferometric Mie and Rayleigh scattering velocity measurements. AIAA Journal, 37(6), 688-694. https://doi.org/10.2514/2.796

    Image processing for interferometric Mie and Rayleigh scattering velocity measurements. / Bivolaru, D.; Ötügen, M. V.; Tzes, Antonios; Papadopoulos, G.

    In: AIAA Journal, Vol. 37, No. 6, 01.01.1999, p. 688-694.

    Research output: Contribution to journalArticle

    Bivolaru, D, Ötügen, MV, Tzes, A & Papadopoulos, G 1999, 'Image processing for interferometric Mie and Rayleigh scattering velocity measurements', AIAA Journal, vol. 37, no. 6, pp. 688-694. https://doi.org/10.2514/2.796
    Bivolaru, D. ; Ötügen, M. V. ; Tzes, Antonios ; Papadopoulos, G. / Image processing for interferometric Mie and Rayleigh scattering velocity measurements. In: AIAA Journal. 1999 ; Vol. 37, No. 6. pp. 688-694.
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