22 April 2006 Optical detection techniques for laser sorting machines
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Proceedings Volume 6189, Optical Sensing II; 61891F (2006); doi: 10.1117/12.660896
Event: SPIE Photonics Europe, 2006, Strasbourg, France
Abstract
In this work we summarize some of the results we obtained during our research of different physical phenomena which take place when a visible or near-infrared laser beam falls in onto a biological product, more in particular on a vegetable or on a fruit. The most important phenomena are surface reflection, selective absorption, fluorescence, absorption in the near-infrared and internal reflection. While the emphasis lays on the identification of the product type we will show that some of the demonstrated sorting principles can also be used for quality sorting: for example a determination of the ripeness of green vegetables or of the water/oil content of vegetables and fruits and a detection of the presence of the very harmful aflatoxines.
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W. Meulebroeck, H. Thienpont, "Optical detection techniques for laser sorting machines", Proc. SPIE 6189, Optical Sensing II, 61891F (22 April 2006); doi: 10.1117/12.660896; https://doi.org/10.1117/12.660896
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KEYWORDS
Luminescence

Absorption

Light scattering

Reflection

Polarization

Reflectivity

Molecules

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