On the morphology of irregular rough particles from the analysis of speckle-like interferometric out-of-focus images

Marc Brunel (1) , Sara González Ruiz (2) , Justin Jacquot (1) , Jeroen van Beeck (2)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie
2 VKI - von Karman Institute for Fluid Dynamics

Using a simplified description, we show that the Fourier transform of the speckle-like out-of-focus image of an irregular rough particle is given by the 2 dimensional-autocorrelation of the shape of the particle. Experiments confirm well this result. Using a matrix transfer based-formulation, we further determine the exact scaling factors between both functions, whatever the imaging system is.

Keywords: Interferometric out-of focus imaging; Optical transfer matrices; Rough objects Morphology

Domains: Engineering Sciences [physics]; Optics / Photonic

Marc Brunel, Sara González Ruiz, Justin Jacquot, Jeroen van Beeck. On the morphology of irregular rough particles from the analysis of speckle-like interferometric out-of-focus images. Optics Communications, 2015, 338, pp.193-198. ⟨10.1016/j.optcom.2014.10.053⟩. ⟨hal-02112737⟩