1 November 1990 Two-color particle velocimetry
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Proceedings Volume 1404, ICALEO '89: Optical Methods in Flow and Particle Diagnostics; (1990); doi: 10.1117/12.35014
Event: ICALEO89, 1989, Orlando, FL, United States
Abstract
A novel method for determining two-dimensional velocity flowfields has been developed. The technique, two-color particle-image velocimetry (PIV), is similar to existing PIV techniques except that two different-color laser sources are used to form the light sheets required for exposing the position of particles in a seeded flowfield. A green-colored laser sheet (formed by a doubled Nd:YAG laser) and a red-colored laser sheet (formed by Nd:YAG-pumped dye laser) are employed sequentially to expose the particle positions which are recorded on 35-mm color film. Analysis of the resulting images involves digitizing the exposed film with color filters to separate the green- and red-particle image fields and processing the digitized images with velocity-displacement software. The two-color PIV technique has the advantage that direction, as well as particle displacement, is uniquely determined because the green-particle image occurs before the red one by a known time increment. Velocity measurements utilizing the two-color PIV technique on a propane jet diffusion flame have been made and are discussed.
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Larry P. Goss, M. E. Post, B. Sarka, D. D. Trump, "Two-color particle velocimetry", Proc. SPIE 1404, ICALEO '89: Optical Methods in Flow and Particle Diagnostics, (1 November 1990); doi: 10.1117/12.35014; https://doi.org/10.1117/12.35014
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KEYWORDS
Particles

Image processing

Nd:YAG lasers

Dye lasers

Velocimetry

Image segmentation

Optical filters

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