A simplified, flow-based calibration method for stereoscopic PIV |
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Authors: | Silvano Grizzi Francisco Pereira Fabio Di Felice |
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Institution: | (1) INSEAN, Italian Ship Model Basin, Rome, 00128, Italy; |
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Abstract: | An improvement of the process of stereo-PIV calibration is presented. The central feature of the proposed technique is that
the calibration of the stereoscopic system is based upon the measurement of a calibrated flow. This is achieved through an
initial two-dimensional calibration of the measurement plane using a single target point, followed by a perspective and laser
sheet thickness optimization that makes use of the measurement of a known reference flow, e.g., a uniform flow. This technique
results in planar domain, three-component (2D–3C) measurements with a simpler calibration phase, which delivers uncompromised
accuracy, compensates for the mechanical misalignment and eliminates the errors deriving from the classical target plate dot
identification. The technique is particularly well suited for towing tanks and other large facilities, and is applied to the
vortex system shed from an underwater bridge sail. |
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Keywords: | |
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