Malvern Instruments Spraytec, User Manual

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A progress bar shows that processing is taking place. On completion, a set
of views showing the averaged measurement parameters becomes available,
starting with the Average PSD view. Right-click on this to see a list of the
other available views.
.
The averaged results appear in the Measurement file window. The average
is created as a new measurement record with the extension .
psd . A new
folder named Averages appears in the Measurement file tree to hold it.
Advanced averages
For pulsed and externally-triggered sprays, two additional types can be calculated:
.
Phase based averaging – generally used for one shot spray applications like
nasal sprays. Averaging is based on the three stages of the spray plume: for-
mation, stabilisation and dissipation.
.
Time-based averaging – used for repetitive spray applications (i.e. fuel in-
jectors). Analysis is based on the triggering points for the repetitive spray
generations.
These averages can be incorporated into the SOP design as described in the
second and third examples (those which include the
Averaging dialogues) in
Chapter 5.
In addition, either type can be calculated for measurement results using the
Edit-Advanced Average command.
User size bands
Within a histogram or a result table, each column of the histogram represents a
“size band” of particles, for example from 0.25 to 0.7
m
m. The default settings for
these are based on the fundamental geometry of the system optics, but the size
bands can be modified by the user.
Complex sets of size bands can be set up for different purposes and saved, making
them available to other users. Size bands are defined during SOP creation using
the second
Analysis dialogue. The relevant part of the dialogue is shown below:
C H A P T E R 6
S p r a y t e c
P a g e 6 . 1 3