Micropipe flow visualization using digital in-line holographic microscopy.
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.
Verrier
Nicolas
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Groupe d'Optique et d'Optoélectronique, UMR 6614-CORIA, avenue de l'Université, 76801 Saint-Etienne du Rouvray cédex, France. nicolas.verrier@coria.fr
Remacha
Clément
C
Brunel
Marc
M
Lebrun
Denis
D
Coëtmellec
Sébastien
S