Abstract: An apparatus for determining the particle size and/or particle shape of a mixture of particles is provided, comprising a feeding device, which passes the mixture of particles through a zone of measurement as a particle flow; an illumination module, which generates illumination beams and illuminates the zone of measurement with them; a detection module comprising two cameras, each recording an area of the zone of measurement assigned to the respective camera, said cameras recording the areas with different magnifications, and comprising an evaluating module, which determines the particle size and/or particle shape on the basis of the recordings of the cameras, characterized in that the illumination module is provided such that it illuminates the two areas with different intensities.

Abstract: An apparatus for determining the particle size and/or particle shape of a mixture of particles is provided, comprising a feeding device, which passes the mixture of particles through a zone of measurement as a particle flow; an illumination module, which generates illumination beams and illuminates the zone of measurement with them; a detection module comprising two cameras, each recording an area of the zone of measurement assigned to the respective camera, said cameras recording the areas with different magnifications, and comprising an evaluating module, which determines the particle size and/or particle shape on the basis of the recordings of the cameras, characterized in that the illumination module is provided such that it illuminates the two areas with different intensities.

Abstract: An arrangement for optical autocorrelation of laser speckle photography (LSP) photographs or particle image velocimetry (PIV) photographs using optical Fourier transforms is disclosed. The object of providing an electro-optical arrangement for optical correlation of LSP film recordings and PIV film recordings which is simple to produce and accurate is met by using an optically addressable liquid crystal SLM (spatial light modulator) for producing the Young's fringe patterns which contains a uniaxial double-refracting liquid crystal layer and is read out with linearly polarized light of a laser light source, wherein the polarization direction of the laser light source on the readout side coincides with the extraordinary semi-axis of the refractive index ellipsoid of the liquid crystal layer.