Background oriented Schlieren images have historically been generated by calculating the observed pixel displacement between a wind-on and wind-o image pair using normalized cross-correlation. This work uses optical flow to solve the displacement fields which generate the Schlieren images. A well established method used in the computer vision community, optical flow is the apparent motion in an image sequence due to brightness changes. The regularization method of Horn and Schunck is used to create Schlieren images using two data sets: a supersonic jet plume shock interaction from the NASA Ames Unitary Plan Wind Tunnel, and a transonic flight test of a T-38 aircraft using a naturally occurring background, performed in conjunction with NASA Ames and Armstrong Research Centers. Results are presented and contrasted with those using normalized cross-correlation. The optical flow Schlieren images are found to provided significantly more detail. We apply the method to historical data sets to demonstrate the broad applicability and limitations of the technique.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Optical Flow for Flight and Wind Tunnel Background Oriented Schlieren Imaging


    Beteiligte:

    Kongress:

    AIAA SciTech Forum and Exposition ; 2017 ; Grapevine, TX, United States


    Erscheinungsdatum :

    2017-01-09


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Keine Angabe


    Sprache :

    Englisch




    Optical Flow for Flight and Wind Tunnel Background Oriented Schlieren Imaging

    Smith, Nathanial T. / Heineck, James T. / Schairer, Edward T. | AIAA | 2017


    Optical Flow for Flight and Wind Tunnel Background Oriented Schlieren Imaging (AIAA 2017-0472)

    Smith, Nathanial T. / Heineck, James T. / Schairer, Edward T. | British Library Conference Proceedings | 2017


    Background-Oriented Schlieren Imaging of Supersonic Aircraft in Flight

    Heineck, James T. / Banks, Daniel W. / Smith, Nathanial T. et al. | AIAA | 2020


    Background-Oriented Schlieren Imaging for Full-Scale and In-Flight Testing

    Raffel, Markus / Heineck, James T. / Schairer, Edward et al. | Tema Archiv | 2014