Patent ID: 8760652

Claim:
Apparatus for measuring light scattering properties of a sample in a liquid medium, wherein the liquid medium with the sample is illuminated by a laser beam ( 2 ) in a measuring cell ( 3 ) transversely to a direction of filling the liquid medium in the measuring cell or transversely to a flow direction of the liquid medium within the measuring cell ( 3 ), comprising a laser ( 1 ), a cylindrical measuring cell ( 3 ), a first inner aperture system ( 4 ), a second outer aperture system ( 5 ) and at least two detectors ( 6 ), wherein the detectors ( 6 ) are arranged outside of the second outer aperture system ( 5 ) so that the detectors ( 6 ) collect the light scattered on the sample within set, different angle ranges, characterized in that the first inner aperture system ( 4 ) and the second outer aperture system ( 5 ) are formed and arranged circularly and concentrically around a longitudinal axis of the measuring cell ( 3 ); and further characterized in that the first inner aperture system ( 4 ) and the second outer aperture system ( 5 ) are both formed as slot apertures, wherein the number of slots in the two aperture systems corresponds to the number of detectors ( 6 ), and each of the aperture systems additionally has an inlet opening ( 9 ) and an outlet opening ( 10 ) for the laser beam ( 2 ); and further characterized in that the first inner aperture system ( 4 ) and the second outer aperture system ( 5 ) have different slot widths depending on the observed angle range of the light scattered on the sample, wherein the slot widths of the first inner aperture system ( 4 ) and of the second outer aperture system ( 5 ) are the same for a given observed angle range of the light scattered on the sample.