Results Obtained with a New Instrument for the Measurement of particle size distributions from diffraction patterns

Abstract

For several years the size distributions of particulate matter have increasingly been determined by using diffraction pattern analysis. In order to evaluate particle size distributions from the far field intensity distribution of light diffracted by a distribution of particles, a linear set of equations must be solved. Since, in many cases of application, conventional methods for solving linear sets of equations become unstable, the calculated particle size distribution may also be grossly in error. By applying special, known mathematical methods we succeeded in obtaining a parameterfree solution of the above problem.After a brief description of the mathematical method used, a diffraction pattern analyser will be presented as well as some experimental results obtained with it. The results obtained with aerosols and suspensions come from experiments performed with narrow-sized latexes and mono-and bimodal particle size distributions of limestone and quartz. 0 VCH Verlagsgesellschaft mbH, D-6940 Weinheim 1985 0176-2265/85/0105-ooM $02.50/0

Pea protein as a substitute of soya bean protein in diets for young pigs: Effects on productivity and digestive traits

“…The MPS of the soya bean products tested and the experimental feeds was determined according to the method outlined by the American Society of Agricultural Engineers (1995) using a filtra 200 (Filtra, S.A., Barcelona, Spain) with 7 sieves ranging in mesh from 2500 to 40 μm. For PPC, the MPS (8.4 ± 2.63 μm) was measured using a Sympatec Helos compact KA laser diffraction equipment (Sympatec GmbH, Clausthal-Zellerfeld, Germany), using a Rodos dry powder dispenser at 2 bar (Heuer and Leschonski, 1985). This methodology was used for PPC because method recommended by the American Society of Agricultural Engineers (1995) is not valid when the particle size of the sample is less than 40 μm.…”

Teaching Fraunhofer diffraction via experimental and simulated images in the laboratory

“…This simple calculation does not consume too much time during the session, but it is really helpful for them to understand the intrinsic relation between the diffraction pattern and the size of the obstacle. That calculation leads to explain applications of particle characterization by analyzing the Fraunhofer diffraction [10][11][12].…”

Problems in Characterizing Transparent Particles by Laser Light Diffraction Spectrometry

“…The scattered light intensity distribution I(r,x), which depends on the particle diameter x and the radial distance to the optical axis r, is defined for a single particle as follows [8]:…”

“…For investigations of a particle collective, the scattered light intensities from the individual particles are superimposed. The particle size distribution of the sample can be calculated from the measured scattered light intensities [8].…”