title: Tracking particles in four dimensions with in-line holographic microscopy.
abstract: We describe a simple holographic method that has enabled us to capture as a single data set the trajectories of micrometer-sized objects suspended in water. By subtracting consecutive holograms of a particle suspension and then adding these difference holograms, we constructed a final data set that contains the time evolution of the particle trajectories free from spurious background interference effects. The method is illustrated by a recording of the motion of 5-10-microm diameter algae in water.
authors.affiliation: Department of Physics and Atmospheric Science, Dalhousie University, Halifax, Nova Scotia B3H 3J5, Canada.
authors.forename: W
authors.initials: W
authors.lastname: Xu
authors.forename: M H
authors.initials: MH
authors.lastname: Jericho
authors.forename: H J
authors.initials: HJ
authors.lastname: Kreuzer
authors.forename: I A
authors.initials: IA
authors.lastname: Meinertzhagen