Tomographic PIV

Flow out of a low swirl burner, in a plane perpendicular to the main flow direction. The 8 channels of the swirler are nicely visualized by the 8 high speed streaks (red iso-surfaces), Lund University, Sweden. 

3D Least Squares Matching (LSM) calculate an average velocity of several particles in a small subsection of the measurement volume. The reconstruction methods first require that we generate a digital volume – the so-called voxel space – which contains the gray level values obtained from the multiple camera views of the illuminated particles in the measurement volume.

The second step is to find the average velocity in small subsections (cuboids) of the voxel space which are similar to the interrogation areas in planar PIV. The velocity is then calculated using the particle motion between two consecutive reconstructed voxel spaces from the consecutive camera images.

The 3D LSM is an iterative method that calculates not only the displacement of a cuboid, but also the rotations, shear, stretching and scaling of the two consecutive gray value distributions. The procedure then uses the two cuboids from the two consecutive voxel spaces and iteratively adjusts them by translation, rotation, shearing and scaling until the best match between the two time steps is found.

3D Least Squares Matching is the most advanced tool for volumetric data analysis since both the full field velocity information and the velocity gradient matrix are provided as a result of the analysis process. Unlike the cross correlation technique where gradients are derived in a second step, 3D LSM yields these results directly. This advantage not only improves the quality of the velocity gradient matrix, but also enhances the subsequent post processing of the data to fully understand the physics of the phenomena under investigation.

Components

PIV lasers for 10-200 Hz Systems

PIV lasers for 10-200 Hz Systems

Dual cavity, flash-pumped Nd:YAG lasers with extensive range of output energies, designed for PIV applications
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Double Frame Cameras

Double Frame Cameras

High resolution, low noise cameras with double-frame capability for PIV
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TR-PIV lasers for 0.5-20 kHz systems

TR-PIV lasers for 0.5-20 kHz systems

A new generation of dual-cavity, diode pumped Nd:YLF lasers for time-resolved PIV applications
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Time Resolved Cameras

Time Resolved Cameras

High-speed cameras with up to 4 MP resolution and up to 25500 frames per second
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Synchronizers

Synchronizers

Combine cameras, lasers, and an intensifier all with different timing needs into a single system with nanosecond precision
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Volumetric Illumination

Volumetric Illumination

Multiple aspect ratios are available making these optics suitable for almost any flow illumination application
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PCs and Workstations

PCs and Workstations

PC or Workstation to control your measurement system; store, analyze and post-process the data; and visualize the results
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Seeding Generators

Seeding Generators

Dantec Dynamics offers liquid and powder seeding generators for LDA and PIV, and fog generators for LDA and flow visualization
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Seeding Materials

Seeding Materials

The choice of the right seeding material to scatter the light from laser beams or a light sheet is crucial to the acquisition of successful experimental data
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Light Guiding Arms

Light Guiding Arms

Ideal for flow-field measurements in confined spaces where it is difficult to launch a light sheet and in experiments in which the laser must be separated from the flow rig due to vibration
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Camera Accessories

Camera Accessories

Lenses, filters, Scheimpflug Mounts, fast shutters, DualScope
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Traverse Systems

Traverse Systems

Map fluid velocity in space and perform boundary layer measurements with this high resolution system
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Laser safety

Laser safety

Laser protective eyewear – Eye protection against hazardous laser light is essential for your safety.
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DynamicStudio for Planar and Tomographic PIV and PTV

DynamicStudio for Planar and Tomographic PIV and PTV

The software for both planar PIV and PTV as well as Volumetric or Tomo PIV and PTV.
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Download Library

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AUTHOR(S)
YEAR
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AUTHOR(S)

M.Beczek, M.Ryżak, A.Sochan, C.Polakowski, D.Hess, A.Bieganowski

YEAR

2020

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Science Direct
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Christoph Brücker, David Hess, Bo B. Watz

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2018

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Franziska Hegner, David Hess, Christoph Brücker

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2015

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Mario Koehler, David Hess, Christoph Kratzsch, Christoph Brücker

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2014

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Hess D., Sastuba M., Kitzhofer J., Brücker Ch.

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2013

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T. Nonn, J. Kitzhofer, D. Hess, Ch. Brücker

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2012

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AUTHOR(S)

Christoph Brücker, Thomas Nonn

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2012

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T. Nonn, V. Jaunet, C. Weissman

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2012

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J. Kitzhofer, C. Brücker, O. Pust, T. Nonn

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2012

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D. Hess, Ch. Brücker, J. Kitzhofer, T. Nonn

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2011

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Prof. Dr.- Ing. habil. Christoph Brücker

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2011

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J. Kitzhofer, P. Westfeld, O. Pust, T. Nonn, H. G. Maas, C. Brücker

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2010

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AUTHOR(S)

Patrick Westfeld, Hans-Gerd Maas, Oliver Pust, Jens Kitzhofer, Christoph Brücker

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2010

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J. Kitzhofer, C. Brücker, O. Pust

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2009

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We offer Volumetric Velocimetry systems to suit a wide range of applications and budgets

Reach out today to learn more about how Dantec Dynamics can provide a solution to meet your unique needs.