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B. Ruck, B. Pavlovski
A New Diffraction-based Laser Measuring Principle for Particle Sizing
The paper describes a new laser–optical measurement principle for particle diameters down to the micrometer range. The new principle can be realized in two versions. In the first version, a laser beam is rotated around a particle within a defined angular range, whereby the resulting diffraction pattern behind the particle is swept across a point detector. In the second version, the illumination of the particle under consideration is fixed in space and the resulting characteristic diffraction pattern behind the particle is rotated and swept over a point detector by means of a rotating mirror. In both cases, a simple point detector detects a time–varying signal which is equivalent to the diffraction pattern of the particle. This signal can be evaluated in time or frequency domain. From many single particle measurements, the particle size distribution can be determined.
tm – Technisches Messen, Oldenbourg Wissenschaftsverlag
Print ISSN: 0171-8096
Volume: 70, 01/2003
Pages: 025