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The fully digital evaluation of photographic PIV recordings

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Abstract

The performance of a purely digital evaluation system for photographic PIV recordings is described. High resolution digital images are obtained from the 35 mm negatives using a commonly available slide scanner. Together with the continually improving capabilities of standard computers, this evaluation system is a cost effective alternative to the traditional analog optical/digital (Young's fringe method) and purely optical PIV interrogation systems. Compared to the optical systems the fully digital evaluation can provide a higher spatial resolution while maintaining a similar measurement uncertainty. Using actual PIV recordings absolute measurement uncertainties are obtained and further predictions toward optimal displacement data recovery are made with the aid of Monte-Carlo simulations. Measurement uncertainties are minimized for particle image diameters on the order of 2 pixels while the reduction of the image depth (i.e. bits/pixel) has little effect. The overall performance of the described digital evaluation is compared to two types of optical evaluation systems.

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Authors and Affiliations

  1. Center for Quantitative Visualization (CQV), c/o DLR, Institut für Strömungsmechanik, Bunsenstraße 10, D-37073, Göttingen, Germany

    Christian Willert

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  1. Christian Willert
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Affiliated with DNW-NWB, DLR-Braunschweig.

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Willert, C. The fully digital evaluation of photographic PIV recordings. Appl. Sci. Res. 56, 79–102 (1996). https://doi.org/10.1007/BF02249375

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  • DOI: https://doi.org/10.1007/BF02249375

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