title: Micropipe flow visualization using digital in-line holographic microscopy.
abstract: Digital in-line holography is used to visualize particle motion within a cylindrical micropipe. Analytical expression of the intensity distribution recorded in the CCD sensor plane is derived using the generalized Huygens-Fresnel integral associated with the ABCD matrices formalism. Holograms obtained in a 100microm in diameter micropipe are then reconstructed using fractional Fourier transformation. Astigmatism brought by the cylindrical micropipe is finally used to select a three dimensional region of interest in the microflow and thus to improve axial localization of objects located within a micropipe. Experimental results are presented and a short movie showing particle motion within a micropipe is given.
authors.affiliation: Groupe d'Optique et d'Optoélectronique, UMR 6614-CORIA, avenue de l'Université, 76801 Saint-Etienne du Rouvray cédex, France. nicolas.verrier@coria.fr
authors.forename: Nicolas
authors.initials: N
authors.lastname: Verrier
authors.forename: Clément
authors.initials: C
authors.lastname: Remacha
authors.forename: Marc
authors.initials: M
authors.lastname: Brunel
authors.forename: Denis
authors.initials: D
authors.lastname: Lebrun
authors.forename: Sébastien
authors.initials: S
authors.lastname: Coëtmellec