In using particle-image velocimetry (PIV) to obtain an instantaneous two-dimensional velocity map in a fluid flow, a double-exposure photograph of the seeded medium is analyzed optically to produce correlation fringes. In an earlier paper we showed theoretically that the signal-to-noise ratio of these fringes, and hence measurement accuracy, is significantly improved by using a two-step photographic process. In this paper, experimental results are presented that support the previous theoretical work and reveal the great potential of PIV in experimental fluid mechanics.
© 1985 Optical Society of America
C. J. D. Pickering and N. A. Halliwell, "Particle-image velocimetry: improving fringe signal-to-noise ratio with a two-step photographic process. Part II," J. Opt. Soc. Am. A 2, 1721-1724 (1985)