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Proceedings Paper

Two-color particle velocimetry
Author(s): Larry P. Goss; M. E. Post; B. Sarka; D. D. Trump
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Paper 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.

Paper Details

Date Published: 1 November 1990
PDF: 11 pages
Proc. SPIE 1404, ICALEO '89: Optical Methods in Flow and Particle Diagnostics, (1 November 1990); doi: 10.1117/12.35014
Show Author Affiliations
Larry P. Goss, Systems Research Lab., Inc. (United States)
M. E. Post, Systems Research Lab., Inc. (United States)
B. Sarka, Systems Research Lab., Inc. (United States)
D. D. Trump, Systems Research Lab., Inc. (United States)

Published in SPIE Proceedings Vol. 1404:
ICALEO '89: Optical Methods in Flow and Particle Diagnostics
Marshall B. Long, Editor(s)

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