Patent ID: 7920260

Claim:
A measuring device for determining the size, size distribution, and/or concentration of nanoscopic particles or hollow spaces in a measuring sample, the degree of opacity of such a measuring sample, or the degree of roughness of a surface of the measuring sample, by determining the wavelength and scattering angle-dependent intensities of a measuring radiation scattered from the measuring sample, the measuring device comprising: a retaining device for a measuring sample to be measured; a detector, comprising at least one detector inlet; an evaluation unit; and at least two radiation sources that are respectively arranged at a distance from each other and at a distance from the measuring sample, which radiation sources provide radiation of a multiple wavelength spectrum or a continuous spectrum, and the radiation intensities of which can be adjusted and/or determined, wherein the radiation sources are in each case configured to emit a ray bundle in essentially parallel rays in the direction of the measuring sample, and wherein the ray bundles that are directed from different radiation sources onto the measuring sample are aligned at different angles onto the measuring sample, in relation to the axis between the detector inlet and the measuring sample; wherein the measuring sample represents a viscous fluid or gaseous measuring sample that contains nanoscopic particles, or a solid, transparent sample body containing nanoscopic particles or hollow spaces that are measurable from the scattered radiation.