Results 161 to 170 of about 61,839 (207)

Electrooptical image shifting for particle image velocimetry

Applied Optics, 1988
The direction of fluid motion can be determined in particle image velocimetry (and laser speckle velocimetry) if the image field is spatially shifted between the first and second exposures, so that the most negative fluid velocity still produces a positive particle image displacement. Two new techniques are described which accomplish very fast accurate
C C, Landreth, R J, Adrian
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Tomographic particle image velocimetry

Experiments in Fluids, 2006
This paper describes the principles of a novel 3D PIV system based on the illumination, recording and reconstruction of tracer particles within a 3D measurement volume. The technique makes use of several simultaneous views of the illuminated particles and their 3D reconstruction as a light intensity distribution by means of optical tomography.
G. E. Elsinga, F. Scarano, B. Wieneke, B. W. van Oudheusden   +3 more
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Thermographic Particle Image Velocimetry

Imaging and Applied Optics 2014, 2014
Planar high-speed temperature and velocity measurements in gaseous flows can be performed simultaneously using micrometer-sized thermographic phosphor particles as tracers. Validation of this concept and applications in turbulent flows will be presented.
Benoit Fond, Christopher Abram, Frank Beyrau   +2 more
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Particle Image Velocimetry

1989
One of the most challenging and time-consuming problems in experimental fluid mechanics is the measurement of the overall flow field properties, such as the velocity, vorticity, and pressure fields. Local measurements of the velocity field (i.e., at individual points) are now done routinely in many experiments using hot-wire (HW) or laser velocimetry ...
L. M. Lourenco, A. Krothapalli, C. A. Smith   +2 more
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Particle Image Velocimetry

2001
Particle Image Velocimetry (PIV) belongs to the class of optical “whole- field” measuring techniques. The name of the method is self-explaining: The velocity distribution in a whole field of a fluid flow is determined by measuring the displacements Δs that the images of tracer particles experience during a time interval Δt.
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Stereoscopic particle image velocimetry

Measurement Science and Technology, 1991
The three components of the velocity field in a plane can be measured simultaneously by combining particle image velocimetry (PIV) and stereoscopy. A set-up has been devised to take two stereoscopic images of the flow simultaneously with only one camera, thus making automatic recording of three-dimensional (3D) velocity fields quite straightforward ...
M P Arroyo, C A Greated
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Particle Image Velocimetry

Vehicle Dynamics International
Making the right choice of high-speed camera is essential for effective and efficient Particle Image Velocimetry (PIV) analysis of airflow. Photron discusses how to make the right selection
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Photogrammetric Particle Image Velocimetry

2004
The Particle-Image Velocimetry (PIV) is a meanwhile quite mature measuring method in its application on a 2-dimensional (2D) measuring plane for the collection of 2 or 3 velocity-components (2C resp. 3C) within this plane (planar PIV). A disadvantage is the limitation to a plane of 1...5 mm thickness.
A. Schimpf, S. Kallweit
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Stereoscopic particle image velocimetry

Experiments in Fluids, 2000
Stereoscopic particle image velocimetry (PIV) employs two cameras to record simultaneous but distinct off-axis views of the same region of interest (illuminated plane within a flow seeded with tracer particles). Sufficient information is contained in the two views to extract the out-of-plane motion of particles, and also to eliminate perspective error ...
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Thermographic Particle Image Velocimetry

Renewable Energy and the Environment, 2013
The particle image velocimetry technique can be extended to simultaneously measure fluid temperatures by seeding thermographic phosphor particles. Following UV excitation, these particles exhibit a temperature-dependent phosphorescence spectrum that can be utilized for thermometry.
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