Distortion compensation for generalized stereoscopic particle image velocimetry

S. M. Soloff, R. J. Adrian, Z. C. Liu

Research output: Contribution to journalArticle

475 Scopus citations

Abstract

Optical distortion due to inaccurate optical alignment, lens nonlinearity, and/or refraction by optical windows, fluid interfaces, and other optical elements of an experiment causes inaccuracy by introducing variable magnification. Since fractional changes in the magnification have a one-to-one effect on the accuracy of measuring the velocity, it is important to compensate for such distortions. A general experimental calibration procedure is described which determines the magnification matrix of a distorted imaging system, and an algorithm is presented to compute accurate velocity field displacements from measurements of distorted PIV images. These procedures form a basis for generalized stereoscopic PIV procedures which permit easy electronic registration of multiple cameras and accurate recombination of stereoscopic displacement fields to obtain the three-dimensional velocity vector field.

Original languageEnglish (US)
Pages (from-to)1441-1454
Number of pages14
JournalMeasurement Science and Technology
Volume8
Issue number12
DOIs
StatePublished - Dec 1997
Externally publishedYes

ASJC Scopus subject areas

  • Instrumentation
  • Engineering (miscellaneous)
  • Applied Mathematics

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