High-frame-rate, high-resolution Cinematographic Particle Image Velocimetry
José L. Gilarranz, Karandeep Singh, Jeonghwan Ko, Othon K. Rediniotis, Andrew J. Kurdila, José L. Gilarranz, Karandeep Singh, Jeonghwan Ko, Othon K. Rediniotis, Andrew J. Kurdila · 35th Aerospace Sciences Meeting and Exhibit · 1997
We present our progress in the development of a high-frame-rate, high-resolution Cinematographic Particle Image Velocimetry (CPIV) system, addressing the development of hardware as well as image processing algorithms. A rotating prism, 16mm film camera is used with frame rates up to 10,000 fps and equivalent pixel resolution of each frame, on the order of 1400 x 1000. A computerized digitization station for automated digitization of entire film rolls was developed. For flow illumination, a high power, noncoherent illumination system was implemented. In terms of image processing algorithms, new techniques are proposed with improved spatial resolution and reliability over existing methods. Emphasis is placed on a new wavelet-based cross-correlation approach. Finally, hardware and software performance are demonstrated via sample water tunnel experiments. (Author)