Abstract
The different contributions to the loss of correlation between image pairs in Particle Image Velocimetry (PIV) have been largely studied when a pulsed laser is used to illuminate the flow. In this case, the flow is well illuminated and the particles appears in the image without blurring. Nevertheless, if a continuous laser (CW) is used to illuminate the flow, light deficiency and particle blurring may appear and contribute to increase the loss of correlation introducing limits to the spatial resolution achievable of velocity field. Here, we develop mathematical expressions for the added loss of correlation which allows to estimate a relationship between the main influence variables of planar PIV set up with CW lasers and the spatial resolution achievable at the cross-correlation step. The mathematical model also allows to find the optimal time of exposure.
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