Chapter 3: Theory
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Operators & Maintenance Manual GENIUS Compact Version UK 0.1 © BESTnv
BESTnv Industrial Research BV, Marinus van Meelweg 20, 5657 EN, EINDHOVEN, THE NETHERLANDS
General tel. +31 (40) 292 2622 - Service tel. +31 (40) 292 2620 - Fax. +31 (40) 292 2633 - Email: service.BESTnv@bestnv.com
3.2.2. Illumination
Contrast
To achieve a good optical effi ciency, a strong, stable and homogeneous illumination is required.
It ensures a high contrast, thereby making colour intensity differences in the product easily visible. After
all, contrast originates from the difference in light refl ection between dark and light spots in the product.
With higher illumination levels, this difference is enlarged. When necessary, optical or software fi lters
can be used to artifi cially create or increase the contrast.
Different Illumination options
To achieve a proper illumination on the scan zone on the belt of the GENIUS Compact (scan zone 1),
the scan zone is generally illuminated from above by 2-6 illumination units, each containing fl uorescent
tubes inside a special housing with refl ectors. The angle and the distance between the illumination units
and the belt are very important to achieve optimum illumination.
Special R(red), G(green), B(blue) and/or I(infra red) LED light units (6 units total) can also be used. These
are controlled by the software to create any given light colour and intensity, which can be very useful to
enlarge the contrast between good and bad product, resulting in a more effi cient sorting process.
With certain specifi c products UV (Ultra Violet) lights are used. This UV light increases the contrast for
those products, for example peas, making the good product red and the defects black. Since the belt
always has to have the same reference colour as the good product, an IR (Infrared) unit is mounted
underneath the belt to give it the same colour value as the good product.
With a GENIUS Compact-S, which is equipped with Full Surround View (bottom unit), the product
and background strip are illuminated by two rotating illumination drums underneath the belt and one
rotating illumination drum as background lighting above the belt. For more info, see chapter 9: The FSV-
system.
For more info on the illumination when using a Laser box, see chapter 7: Laser Box Option.
Warm-up time
Fluorescent tubes need approximately 30 minutes to reach the appropriate stable light level and colour
temperature. Do not forget to take this warm-up time, which is also necessary for the cameras, into
account when starting up the machine.
Attention: - Remember to wait 30 minutes (warm-up time) after starting up the machine,
before taking a new reference line and starting up the sorting process.
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