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High-speed Particle Image Velocimetry Near Surfaces

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New space domain processing technique for pulsed laser velocimetry.

M P Wernet, R V Edwards

|June 23, 2010

Summary

A new direct space domain processing technique significantly speeds up laser velocimetry data analysis. This method provides accurate velocity vector information in minutes, overcoming limitations of current high-precision techniques.

Area of Science:

Fluid Dynamics
Optical Measurement Techniques

Background:

Current pulsed laser velocimetry (PLV) methods provide high precision (1%) velocity estimates.
Existing techniques can require hours of processing on specialized hardware.
A faster, less accurate (~5%) method with unambiguous velocity vectors is sometimes acceptable.

Purpose of the Study:

To examine a direct space domain processing technique for PLV data.
To achieve faster processing times while maintaining unambiguous velocity vector information.
To evaluate the technique's superiority over existing methods.

Main Methods:

Employed a novel data coding and reduction technique directly utilizing particle time history.
Utilized a direct space domain processing approach.

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Processed complex convection vortex flow data.

Main Results:

The direct space domain technique processed complex flow data in under 2 minutes on a standard PC.
Generated a 2-D flow field map with over 300 velocity vectors.
Demonstrated superiority over other known data reduction techniques for speed and unambiguous vector output.

Conclusions:

The direct space domain processing technique offers a fast and effective alternative for PLV data analysis.
This method eliminates the 180-degree directional ambiguity found in some other techniques.
Achieves objectives of speed and unambiguous velocity vector data, making it suitable for specific applications.