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High precision image-based tracking of a rigid body moving within a fluid

Laurence, Stuart and Martinez Schramm, Jan (2010) High precision image-based tracking of a rigid body moving within a fluid. 63rd Annual Meeting of the APS Division of Fluid Dynamics, 21.-23. Nov. 2010, Long Beach, USA.

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Official URL: http://meetings.aps.org/Meeting/DFD10/Event/134408


Precise measurement of the displacement, velocity and acceleration of a moving rigid body is of interest in many applications. The use of imaging techniques to obtain such information is an attractive option, particularly for movement within a fluid, as such measurements are inherently non-intrusive. Here we describe a class of imaging techniques based on edge detection and least-squares fitting for determining the displacement of a body, from which velocities and accelerations are readily derived. The use of edge-detection allows for potentially higher precision than correlation-based techniques. The accuracy of the techniques is estimated using both artificially generated images and calibrated measurements, and displacement errors of the order of a few thousandths of a pixel are shown to be obtainable for camera noise levels of a few percent. The resulting uncertainties in velocity and acceleration measurements are also analyzed. Several applications are then described, with particular emphasis on force measurements in short duration supersonic and hypersonic wind tunnels.

Document Type:Conference or Workshop Item (Speech)
Title:High precision image-based tracking of a rigid body moving within a fluid
AuthorsInstitution or Email of Authors
Laurence, Stuartstuart.laurence@dlr.de
Martinez Schramm, JanUNSPECIFIED
Refereed publication:No
In ISI Web of Science:No
Volume:Vol. 55
Series Name:Conference Proceedings
Keywords:Optical tracking; force measurement
Event Title:63rd Annual Meeting of the APS Division of Fluid Dynamics
Event Location:Long Beach, USA
Event Type:international Conference
Event Dates:21.-23. Nov. 2010
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Raumfahrzeugsysteme - Anlagen u. Messtechnik (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Stuart Laurence
Deposited On:21 Dec 2010 15:10
Last Modified:21 Dec 2010 15:10

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