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

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Abstract

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.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Seoul National University, 151-742, Seoul, Korea

    S. D. Lee & S. H. Chung

  2. Department of Mechanical Engineering, Texas A&M University, 77843-3123, College Station, TX, USA

    K. D. Kihm

Authors
  1. S. D. Lee
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  2. S. H. Chung
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  3. K. D. Kihm
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Additional information

The authors like to acknowledge the partial financial support provided from the Turbo and Power Machinery Research Center (TPMRC) of Seoul National University, Seoul, Korea.

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Lee, S.D., Chung, S.H. & Kihm, K.D. Suggestive correctional methods for PIV image biasing caused by a rotating mirror system. Experiments in Fluids 21, 201–208 (1996). https://doi.org/10.1007/BF00191692

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  • DOI: https://doi.org/10.1007/BF00191692

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