University of Illinois Urbana-Champaign

Distortion compensation for generalized stereoscopic particle image velocimetry

Soloff, Steven M.; Adrian, Ronald J.; Liu, Zi-Chao

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https://hdl.handle.net/2142/112558

Description

Title
Distortion compensation for generalized stereoscopic particle image velocimetry
Author(s)
  • Soloff, Steven M.
  • Adrian, Ronald J.
  • Liu, Zi-Chao
Issue Date
1997-05
Keyword(s)
  • Particle Image Velocimetry
  • Distortion Compensation
Abstract
Optical distortion caused by inaccurate optical alignment, lens nonlinearity, and/or refraction by optical windows, fluid interfaces, and other optical elements of an experiment cause 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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 855
  • 1997-6016
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112558
Sponsor(s)/Grant Number(s)
Office of Naval Researchearch 97/05; TSI Inc., St Paul Minnesota 97/05
Copyright and License Information
Copyright 1997 Board of Trustees of the University of Illinois

Owning Collections

Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.