Abstract
Particle image velocimetry (PFV) based on an optical flow equation requires numerical evaluation of temporal differential terms between two particle images, which has an unmanageable source of noises. In this research, by using a generally available camera with a polarization imaging sensor, particle images are taken with gain variation within an exposure tune. Then, the weighted time integrals of the optical flow equation are tried to be used for optical flow estimation from single frame particle image. Images with sinusoidal gain variations during an exposure tune are used in this study by setting a linear polarization plate rotating at a constant angular velocity in front of the camera. Optical flow velocity fields are obtained by the proposed technique and the average velocity profiles show a good agreement with the imposed velocity profiles.
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