Abstract
Light field cameras have some advantages over classic cameras in a narrow field of application, such photography, cinematography surveillance and quality control in industry. Light field cameras have larger depth of field, compare to regular camera, but lower spatial resolution along optical axis then binocular system. However, 3D velocity measurements using light field are reasonable alternative to modern 3D PIV measurements. The nature of light field image requires extra reconstruction step which affects overall accuracy. In this article, light field PTV was compared to Tomo-PIV. Both techniques were used to measure 3D velocity fields in a turbulent wake past confined cylinder.
Highlights
Modern light-field optical devices have been started to use in experimental fluid dynamics research
"No overlap" assumption could be eliminated by using other reconstruction algorithm to reconstruct full 3D image instead of the total focus and the depth map
In the case of Tomo-PIV experiment the measurement system consisted of a high-speed Nd:YLF New wave Pegasus (50 mJ, 527 nm, at 1 kHz) laser, four high-speed PCO.1200 hs (1024×1280 pix2, 12 um pixel size, 10 bit, 636 Hz at full resolution) cameras and Polis synchronizing device
Summary
Modern light-field optical devices have been started to use in experimental fluid dynamics research. Several reconstruction algorithms for light field images have been proposed [1, 2, 3, 4]. Calculation of a depth map from a light field image is an ill-posed problem, since a target equation system is underdetermined, similar to 3D reconstruction from several 2D projections. Experimental whole-field measurements of the velocity of fluid flow in a slotted jet [5] and the wake of a cylinder using a light field camera are performed. The used Light-Field PTV reconstruction techniques, results of the experiment, and comparison of the results with a reference Tomo-PIV measurements are described below
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