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Chapter 10: The Laser Box
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
Picture: Basic principle
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10.2.2. Basic principle laser sorting
The tightly focused laser beam is aimed at a rotating polygon mirror, which refl ects the light towards a
specifi cally chosen background drum (surface colour and structure of background drum should be similar
to that of the good product). Every mirror surface produces a scan from left to right and the polygon mirror
is rotating at a speed of 12.000 rpm. Multiply this number by 10, the number of surfaces on the polygon
mirror, and you will see that every minute 120.000 scans are being realized, this equals 2000 scans per
second. In other words, every laser scans the full width of the product stream at least 2000 times per
second (depending on the product settings).
A part of this emitted laser light is refl ected back into the laser box via the same polygon mirror, and
captured by a very sensitive light receiver. This receiver transforms the captured light into an electronic
signal, which is then sent to the PVS sorting computer for further processing.
1. Electronics
2. Light receiver
3. Lens
4. Laser source
5. Mirrors
6. Rotating polygon mirror
7. Background drum
8. Start of scan line
9. End of scan line
10. Scan direction
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