A device for the determination of particle sizes and / or particle size distributions, by means of light diffraction

摘要

A device for the determination of particle sizes and / or particle size distributions withat least one laser light source (1),an illumination unit (2) with a collimator lens (5) for generating a parallel measuring light beam (6) a high cohesion of the light emitted by the laser light source, which is constructed as a monomode light guide (24), on the active core at the inlet end (23) the light emitted by the laser light source is fed and whose outlet end (25) in the focal point of the collimator lens (5) is arranged and the exit light cone (26) on the collimator lens falls,a device (7) for feeding a disperse particle sample (9) in a measuring zone (8) of the parallel measuring light beam, an imaging device (14), which the particles to a measuring radiation diffracted light in the focal plane of the imaging device which is arranged in the field of photodetectors (16), anda "off " value measuring device (20) for the calculation of particle sizes or particle size distributions from on the basis of the intensity distribution of the diffraction spectrum of the photodetectors generated electrical measuring signals,characterized by the ,that the free diameter of the..