spectra, the power of the light source
and from where the light is sent
make the difference. This range of
illumination characteristics offers a
more precise selection of illumination
system for individual sorting tasks.
For example, often it is impossible to
separate sunflower from sclerotia by
using standard RGB systems.
Therefore, a NIR system is
recommended. To separate red rice
from white rice in paddy production,
where the red coloured bran is
beneath the rice husk and can only
be seen after husking, a powerful
translucence system is needed.
A combination of RGB and shape
could be successfully applied where
two different soybean varieties with
different hilum colour and seed
dimensions have to be separated.
Optical sorting can be even more
precise than the human eye when
defect type and illumination systems
fit to each other. Absorbed, reflected
and/or transmitted light can provide the
information that is needed for defect
detection. Light source, optic design
and machine construction decide
which illumination can be used in
respective optical sorters.
When results with shape and
wavelength in the visible range of 400
– 700 nm (RGB) become limited, then
the OS 901i with NIR/SWIR camera
technology can be a solution that
has a 950 – 1,700 nm wavelength
bandwidth. The state of the art RGB
and NIR technologies can only detect
defects on the seed surface.
But when defects in the inside of
the kernel have to be detected and
the kernel has some translucence
properties, than the PETKUS/ROEBER
OS 901 t comes into play. The strong,
homogeneous and high quality LEDs
inside the OS 901 t as well as the
special light configuration allows for a
look through some grain species.
Only the PETKUS/ROEBER OS 901
can offer variable luminance for
variable defects, combined in one
platform.
OS f-class as an example for new
optical sorters
A new type of optical sorter is
launched by PETKUS/ROEBER in
2018. The OS f-class is the first in
optical sorting for small seeds such as
vegetables, flowers, grass and spices.
It allows cleaning of small seeds to the
highest quality level where nowadays
standard colour sorters fail due to
unprecise ejection of standard air
nozzles, low resolution or insufficient
particle orientation. Excellent sorting
results are even possible for small
seeds like Origanum vulgare (TKW ~
0.1 – 0.13 g).
Intensive testing with various species
www.perryengineering.com
[email protected]
+44 (0)1404 890300
00263 712 833687
The UK’s Most Experienced Manufacturer of Materials Drying & Handling Equipment
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Mr Nathan Douglas from Lions Den Farms, Zimbabwe, said:
“Perry use the highest quality materials on their equipment. The technology and touch screen
user
interface makes it extremely easy to use and monitor, one unique & extremely helpful
feature is
the ability to link the control panel to the internet to remotely control the drier. I have
been pleased
with the technical support & training we have received, they have a very personal
way of doing
business. I highly recommend Perry & its equipment.”
November - December 2018 | 21