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Proceedings Paper

Detection of foreign substances in food using thermography
Author(s): Peter Meinlschmidt; Volker Maergner
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Paper Abstract

This paper gives a short introduction into the possibility of detecting foreign bodies in food by using IR thermography. The first results shown for combinations of cherries and chocolate and berries contaminated with leaves, stalks, pedicel and thorns could be easily evaluated manually. Therefore the differing emissivity coefficients or the different heat conductivities and/or capacities are used for differentiation. Applying pulse thermography, first heat conductivity measurements of different food materials are performed. Calculating the contrast of possible food / contaminant combinations shows the difficulty of differentiating certain materials. A possible automatic evaluation for raisins contaminated with wooden sticks and almonds blended with stones could be shown. The power of special adapted algorithms using statistical or morphological analysis is shown to distinguish the foreign bodies from the foodstuff.

Paper Details

Date Published: 15 March 2002
PDF: 7 pages
Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); doi: 10.1117/12.459608
Show Author Affiliations
Peter Meinlschmidt, Fraunhofer Wilhelm-Klauditz-Institut Holzforschung (Germany)
Volker Maergner, Technische Univ. Braunschweig (Germany)

Published in SPIE Proceedings Vol. 4710:
Thermosense XXIV
Xavier P. Maldague; Andres E. Rozlosnik, Editor(s)

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