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http://dx.doi.org/10.3795/KSME-B.2003.27.6.736

Development of 3-D Stereo PIV by Homogeneous Coordinate System  

Kim, Mi-Young (한국해양대학교 대학원)
Choi, Jang-Woon ((주)아이아이티)
Nam, Koo-Man ((주)아이아이티)
Lee, Young-Ho (한국해양대학교 기계.정보공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.6, 2003 , pp. 736-743 More about this Journal
Abstract
A process of 3-D particle image velocimetry, called here, as '3-D stereo PIV' was developed for the measurement of an illuminated slied section field of 3-D complex flows. The present method includes modeling of camera by a calibrator based on the homogeneous coordinate system, transfromation of the oblique-angled image to the right-angled image, identification of 2-D velocity vectors by 2-D cross-correlation equation, stereo matching of 2-D velocity vectors of two cameras, accurate calculation of 3-D velocity vectors by homogeneous coordinate system, removal of error vectors by a statistical method followed by a continuity equation criterior, and finally 3-D animation as the post processing. An experimental system was also used for the application of the proposed method. Three analog CCD cameras and an Argon-Ion Laser(300mW) for illumination were adopted to capture the wake flow behind a bluff obstacle.
Keywords
Homogeneous Coordinate System; 3-D Stereo PIV; Camera Modeling; Perspective Transform; Error Vector;
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