Chapter 4 Making measurements
Page 4-28 MAN 0474
Sample - Material
Use the Material properties section to enter physical characteristics of the mate-
rial being measured.
Spherical
(continued)
This mode uses Mie Theory, and therefore requires input of
the optical properties of your sample in order to calculate a
particle size distribution.
The advantage of this is that it provides the possibility of
obtaining accurate size distributions for all particle sizes.
Opaque Particle
(Fraunhofer
Approximation)
The Fraunhofer Approximation can be used to calculate par-
ticle size distributions in cases where the particle size is
large and where the particles can be assumed to be com-
pletely opaque. It is the easiest mode to use, as you do not
have to provide any optical properties in order to calculate a
size distribution. However, its use may lead to inaccurate
results, particularly for small particles below 50 microns in
size or for those which are transparent.
Section/Option Description
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