METHOD AND DEVICE FOR DETERMINING FEATURES OF PARTICLES BY MULTIPARAMETRIC CAPTURE OF SCATTERED LIGHT AND EXTINCTION SIGNALS

摘要

The invention relates to a method and a device for determining characteristic variables of particles in the nano-scale and micro-scale size range dispersed in gases and liquids, specifically the number distribution and concentration, by means of particle photometry. According to the invention, this is achieved by capturing scattered light measurements in a photometer for a variable number of aperture or reception angles, and evaluating the particle features using evaluation algorithms applied to the scattered light intensities determined. Determination of the particle characteristics over a size range of multiple decades is possible without the requirement to swap out or modify the geometry of the sample measuring chamber. The device according to the invention comprises at least one laser (1) for generating at least one laser beam (3), at least one optical input module (2) for shaping the laser beam (3) and configuring a focus geometry (6), a cell for flow-through measurements (5) advantageously with hydrodynamic focussing, in which forwards scattered light radiation (6) and sideways scattered light radiation (7) is generated by the laser beam (3), optical output modules (8) in the forwards scattered light beam (6) and optical output modules (9) in the sideways scattered light beam (7), semi-translucent mirrors (10), cameras (12) and photomultipliers (11a, 11b), wherein scattered light measurements are taken by means of the photomultipliers (11a, 11b) for a variable number of opening or receiving angles and particle features are determined by means of evaluation algorithms from the scattered light intensities determined for the forwards scattered light beam (6) and the sideways scattered light beam (7) .