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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 6 — Feb. 20, 2001
  • pp: 757–764

Systematic errors in optical-flow velocimetry for turbulent flows and flames

Joseph Fielding, Marshall B. Long, Gabriel Fielding, and Masaharu Komiyama  »View Author Affiliations


Applied Optics, Vol. 40, Issue 6, pp. 757-764 (2001)
http://dx.doi.org/10.1364/AO.40.000757


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Abstract

Optical-flow (OF) velocimetry is based on extracting velocity information from two-dimensional scalar images and represents an unseeded alternative to particle-image velocimetry in turbulent flows. The performance of the technique is examined by direct comparison with simultaneous particle-image velocimetry in both an isothermal turbulent flow and a turbulent flame by use of acetone–OH laser-induced fluorescence. Two representative region-based correlation OF algorithms are applied to assess the general accuracy of the technique. Systematic discrepancies between particle-imaging velocimetry and OF velocimetry are identified with increasing distance from the center line, indicating potential limitations of the current OF techniques. Directional errors are present at all radial positions, with differences in excess of 10° being typical. An experimental measurement setup is described that allows the simultaneous measurement of Mie scattering from seed particles and laser-induced fluorescence on the same CCD camera at two distinct times for validation studies.

© 2001 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.7250) Instrumentation, measurement, and metrology : Velocimetry
(150.4620) Machine vision : Optical flow

History
Original Manuscript: May 15, 2000
Revised Manuscript: September 14, 2000
Published: February 20, 2001

Citation
Joseph Fielding, Marshall B. Long, Gabriel Fielding, and Masaharu Komiyama, "Systematic errors in optical-flow velocimetry for turbulent flows and flames," Appl. Opt. 40, 757-764 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-6-757


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