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1 |
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Sample particles are
dropped between a video camera and synchronized strobe light by
a vibrating feeder. When the strobe flashes, the camera takes an
image of the particles. This image is then digitized by a
computer frame grabber. For different products, the user
can select either a camera with height magnification or a camera
with wide field of view according to the particle size in the
sample. |
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2 |
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A digital image is made up of
uniform size pixels. By counting the number of pixels in each particle, the size
and shape of the particle can be determined. Particles are measured for area, perimeter, and min and max diameter.
From these measurements, shape factor, aspect ratio, and
particle volume are calculated. Thousands of particles can
be measured in each digital image and images can be taken at up
to 20 frames per second. Total sample analysis time is
generally 3 to 5 minutes. |
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3 |
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After measurement
of thousands of particles, size and shape data is displayed in particle size bins and
sieve size bins. Sieve and shape results can be adjusted based on
customer results so PartAn results match current tests. Shape and aspect ratio are
displayed by size fraction. Totals and averages for the entire sample are also
displayed i.e. average size, total non-spherical particles, D10, D90, etc. |
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video image
analysis, image analysis, imaging |
video image
analysis, image analysis, imaging |
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Particle
Measurements |
Size
Range |
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Diameter,
Length, Width, Aspect ratio, Shape Factor |
10
microns to 6 inches |
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Calculated
Results |
Analysis
Time |
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Sieve
Fractions, Average Size, % Non-Spherical, D10, D50, D90 |
2
to 5 minutes |
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video image
analysis, image analysis, imaging |
video image
analysis, image analysis, imaging |
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