Adaptive particle image velocimetry based on sharpness metrics

Teich, M.; Grottke, Jan; Radner, Hannes; Büttner, Lars; Czarske, Jürgen

doi:10.1186/s41476-018-0073-0

Cited by 7 publications

(5 citation statements)

References 27 publications

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“…Among them applying special optical elements, like prisms filled with water, to provide light running through the optical interface at 90 o angle, thus making aberrations to be negligible [9]. Such technique is often applied in the case of fluid flow analysis using the methods of stereoscopic particle velocity measurements (PIV -particle image velocimetry) [10].…”

Section: Related Workmentioning

confidence: 99%

Photogrammetric 3D Measurements and Visualization of Flow in Hydrodynamic Tunnel

Knyaz

Kniaz

Ippolitov

et al. 2022

Proceedings of the 32nd International Conference on Computer Graphics and Vision

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Flow visualization is an important mean for studying flow processes in aerodynamics and hydrodynamics. It allows obtaining qualitative valuable information about flow behaviour, that is needed for understanding of aerodynamic performance of an aircraft, especially in critical conditions. With growing advances in 3D optical measuring techniques, accurate 3D registration and measurements of fast developing processes became possible. The paper addresses the problem of accurate metric 3D reconstruction of flow in hydrodynamic tunnel that is necessary for studying aerodynamic process in aircraft icing conditions. It presents the techniques developed for optical measurement system calibration and for accurate flow 3D registration, and the results of laboratory flow 3D reconstruction and visualization. Experimental evaluation of the developed techniques in laboratory hydrodynamic tunnel demonstrated high accuracy of 3D measurements and readiness for applying in aircraft icing study.

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Section: Related Workmentioning

confidence: 99%

Photogrammetric 3D Measurements and Visualization of Flow in Hydrodynamic Tunnel

Knyaz

Kniaz

Ippolitov

et al. 2022

Proceedings of the 32nd International Conference on Computer Graphics and Vision

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show abstract

“…To exploit the effect of vanishing aberrations for light rays running through the optical interface at 90 o angle, special optical elements (such as prisms filled with water) are used [23]. Such technique is often applied in the case of fluid flow analysis using the methods of stereoscopic particle velocity measurements (PIV -particle image velocimetry) [24].…”

Section: Figure 1: Flow Visualization In Hydrodynamic Tunnelmentioning

confidence: 99%

Accurate 3D Visualization of Real Flow in Aerodynamic Study

Knyaz¹,

Tiddi²,

Novikov³

et al. 2022

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Physical flow modelling is a powerful tool in aerodynamic researches, especially in analysis of complicated and dangerous conditions. It allows to study flow behaviour and to obtain reliable results via similitude concept, that is widely used in aerodynamics and hydrodynamics. Visualization of flow jets is one of the basic tools for analysis of flow behaviour under different flying conditions. Optical registration and 3D measurement techniques extend the capacities of visual flow study, providing both qualitative and quantitative data. The presented study addresses the problem of development of the vision-based technique for accurate flow 3D registration and 3D visualization. Algorithms allowing accurate 3D reconstructing of flow jets are presented, along with discussion of application for experimental flow 3D visualization.

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“…For PIV measurements in fluctuating refractive index fields in air, the systematic measurement error has been determined and partially corrected [4,5]. Approaches for measuring and correcting the measurement errors of randomly fluctuating surfaces of the liquid-air phase transition have been proposed, but these are either too slow [18] or only feasible for changes in the scale of micrometer [20]. Indeed, PIV measurements of the coolant flow in a grinding machine have not yet been studied.…”

Section: State Of the Artmentioning

confidence: 99%

Optical Flow Field Measurements of The Coolant In A Grinding Machine

Espenhahn

Schumski

Vanselow

et al. 2021

Preprint

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Since the cooling mechanism of industrial grinding is not yet fully understood, a measurement of the coolant liquid flow field near the grinding wheel is desired. However, the curved surfaces of the liquid phase result in unpredictable light deflections and reflections, which impedes optical flow measurements. In order to obtain qualitative and quantitative information regarding the flow velocity field of the coolant liquid, shadowgraphy in combination with a pattern correlation technique as well as particle image velocimetry are applied in a grinding machine and studied with respect to their measurement capabilities. Particle image velocimetry enables flow measurements inside the laminar coolant jet, whereby the shadowgraph imaging velocimetry complements these measurements and is in particular suitable for spray-like flow regimes. As a result, optical flow field measurements of the coolant flow in a grinding machine are shown to be feasible, which is required to understand the flow mechanisms that affect the grinding cooling process.

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Adaptive particle image velocimetry based on sharpness metrics

Cited by 7 publications

References 27 publications

Photogrammetric 3D Measurements and Visualization of Flow in Hydrodynamic Tunnel

Photogrammetric 3D Measurements and Visualization of Flow in Hydrodynamic Tunnel

Accurate 3D Visualization of Real Flow in Aerodynamic Study

Optical Flow Field Measurements of The Coolant In A Grinding Machine

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