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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Druckformat: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v3.i4.30
pages 265-277

CORRECTION OF PIV IMAGE BIASING USING TWO CO-ROTATING MIRRORS

Kenneth D. Kihm
Texas A&M University College Station, TX; and Micro/Nano-Scale Fluidics and Energy Transport Laboratory, University of Tennessee, Mechanical, Aerospace and Biomedical Engineering Department, Knoxville TN 37996-2210, USA
S. D. Lee
Department of Mechanical Engineering, Seoul National University, Seoul 151-742, Korea
Suk Ho Chung
Clean Combustion Research Center King Abdullah University of Science and Technology Thuwal, Saudi Arabia

ABSTRAKT

The rotating mirror configuration in particle image velocimetry (PIV) is generally used to provide an artificial image shift to resolve the directional ambiguities for the recorded particle image pairs. However, the reflected image from the rotating mirror inevitably creates normal velocity components with respect to the image plane, and this normal component causes spatially distributed systematic image errors. A potential solution for the problem is proposed to replace the single rotating mirror with two co-rotating mirrors. The use of two co-rotating mirrors reduces the image biasing with desired amounts of the velocity shift available, and, at the same time, makes the image biasing uniform on the entire image field so that analytical corrections for the biasing are readily feasible. Detailed imaging kinematics of the suggested method are presented to improve the design of practical PIV systems. Also presented is experimental confirmation of the image correction using two co-rotating mirrors.