Suggestive correctional methods for PIV image biasing caused by a rotating mirror system

S. D. Lee*, S. H. Chung, K. D. Kihm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A rotating mirror is widely used to generate the velocity shift that can resolve the directional ambiguities of PIV (particle image velocimetry) measurements. The rotating mirror system inevitably creates the normal displacement of the resulting PIV images and causes systematic image errors. Two corrective methods are proposed to eliminate or reduce the image biasing in PIV system. The use of two linearly traversing mirrors, instead of a single rotating mirror, shows that image biasing can be eliminated and the velocity shift well generated. As a second option, two co-rotating mirrors, instead of one, can reduce the image biasing with a maximum velocity shift available. Detailed imaging kinematics of the two suggestive methods are presented to lead to designing of practical devices that improve the PIV capabilities by reducing the systematic image errors.

Original languageEnglish (US)
Pages (from-to)201-208
Number of pages8
JournalExperiments in Fluids
Issue number3
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes


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