Back-projection algorithm with misalignment corrections for 2D3C stereoscopic PIV
- 2 August 2001
- journal article
- Published by IOP Publishing in Measurement Science and Technology
- Vol. 12 (9), 1371-1381
- https://doi.org/10.1088/0957-0233/12/9/301
Abstract
In stereoscopic PIV mapping and warping algorithms are used to back-project the image information on the object plane. The mapping algorithm back-projects each pixel, whereas the warping algorithm back-projects the 2D displacement vectors. In this paper, both algorithms and the misalignment of the laser sheet regarding the object plane are considered. Then, a new algorithm using both mapping and warping algorithms is described for a 2D3C angular stereoscopic PIV set-up with standard lenses and the so-called Scheimpflug condition. The accuracy of the new algorithm, that takes into account laser sheet misalignment, is compared to the previous algorithm on the same sets of images. These sets are recorded from a paper pattern mounted on a 3D translation and rotation stage and from a turbulent pipe flow. The tests show that the accuracy benefit is one order of magnitude on these sets. The accuracy gain depends on the laser sheet misalignment magnitude, which can be measured using the mapping algorithm.Keywords
This publication has 7 references indexed in Scilit:
- Stereoscopic particle image velocimetryExperiments in Fluids, 2000
- Stereoscopic digital particle image velocimetry for application in wind tunnel flowsMeasurement Science and Technology, 1997
- Distortion compensation for generalized stereoscopic particle image velocimetryMeasurement Science and Technology, 1997
- Three-dimensional particle image velocimetry: experimental error analysis of a digital angular stereoscopic systemMeasurement Science and Technology, 1997
- The effect of a discrete window offset on the accuracy of cross-correlation analysis of digital PIV recordingsExperiments in Fluids, 1997
- Scheimpflug stereocamera for particle image velocimetry in liquid flowsApplied Optics, 1995
- Stereoscopic particle image velocimetry applied to liquid flowsExperiments in Fluids, 1993