Special Presentations
The system presentations contains two special presentations, “Fraunhofer 3$$D”
and “Reference Reticle 3$$1”. There is also a third special presentation, 3$$A, that
can be found when you select a presentation by using the “Select by code” facility.
The two presentations 3$$A and 3$$D on your disc are the Fraunhofer
presentations for samples dispersed in air with refractive index 1.0 (3$$A) and
dispersed in water with refractive index 1.33 (3$$D). These are provided to allow
the Mastersizer to be compared with other instruments that only provide the
simpler Fraunhofer analysis. The Fraunhofer model is applicable with reasonable
accuracy down to approximately 10microns. Below this it becomes systematically
in error, to a degree which of course depends on the actual optical properties of
the sample, with a tendency to overestimate the volume of fine particles. For this
reason it is advisable to use one of the “Standard” model unless the measurement
is specifically intended to be compared with other equipment which uses
Fraunhofer scattering theory.
A special presentation, 3$$1, is provided for use with the Malvern Diffraction
Reference Reticle. Contact your Malvern Instruments representative, or see the
Reticle manual, for more information.
Calculating the result
Once the optical model and presentation has been chosen the final procedure is to
calculate the result.
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ILL 2062
CHAPTER 5
Getting Started
Page 5.8
MAN 0101
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