FIELD: equipment and method for detecting foreign matter or contaminants in material, such as tobacco leaves.
SUBSTANCE: method involves directing infrared beams onto material on conveyor; measuring respective values of reflection intensity of components with wave lengths of 1,200 nm and 1,700 nm, or 1,940 nm reflected by material; comparing measured values of reflection intensity and values of reflection intensity of components with characteristic wave lengths, inherent with said material; detecting contaminants in material in accordance with comparison results.
EFFECT: increased efficiency in detecting foreign matter in any sort or diversity of tobacco leaves, when apparatus is positioned at one side of tobacco leaves transportation path.
11 cl, 9 dwg
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