Abstract
The inability to distinguish between particle images and noise in holographic reconstruction of dense particle fields hampers the advancement of holographic particle diagnostic techniques including holographic particle image velocimetry. We developed a method to separate particles from the noise by unlocking a unique particle signature in the complex reconstructed field. This complex-wave signature is present in digital particle holograms recorded at any scattering angle. Simulations of single and multiple particle holograms, as well as preliminary laboratory particle-field experiments, not only demonstrated the existence of the particle signature but also evaluated its ability to remove noise. Regardless of particle seeding density, scattering angle of hologram recording and particle size range, the particle identification∕validation routine consistently provides removal of “bad” particles and of good particles.
© 2007 Optical Society of America
Full Article | PDF ArticleMore Like This
Gang Pan and Hui Meng
Appl. Opt. 42(5) 827-833 (2003)
Lujie Cao, Gang Pan, Jeremy de Jong, Scott Woodward, and Hui Meng
Appl. Opt. 47(25) 4501-4508 (2008)
Ye Pu and Hui Meng
Appl. Opt. 44(36) 7697-7708 (2005)