6. Optical sorting by surface examination
This technique uses cameras to examine the surface of a circulating particulate product, illuminated under controlled conditions.
The criteria examined are shape, particle size, and color in the broadest sense: the spectrum of light reflected by the object in the visible, infrared (IR) or ultraviolet (UV) range. Products are illuminated by lamps that deliver the required spectrum: high-frequency neon, incandescent lamps (visible or IR), high-power light-emitting diodes (LEDs).
6.1 Principle of construction and detection
Visible image analysis detection systems have been developed for sorting all particulate food products transported in bulk on conveyor belts: fresh or blanched vegetables and fruit for appertizing or freezing, potatoes,...
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Optical sorting by surface examination
Optical sorting by transmission vision: mirage
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