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Agricultural Engineering Research - English edition

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Browsing Agricultural Engineering Research - English edition by Person "Beuche, Horst"

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    Infrared Imaging for Plant Protection
    (2005) Hellebrand, Hans Jürgen; Dammer, Karl-Heinz; Beuche, Horst; Herppich, Werner B.; Flath, Kerstin
    Fungi infections, which may cause variations of plants’ surface tem- perature, can be recognised by infrared cameras in the thermal range (MIR: λ = 8-12 μm) under laboratory conditions. In the field, pro- nounced natural temperature variations of several Kelvin within the crop canopy prevent the recognition of infected plants by commercial thermal vision systems as stand-alone solutions. Near infrared cam- eras ( λ = 0.9-1.7 μm) fitted with band-pass filters show different inten- sity distributions of the reflected radiation. The evaluation of the spec- tral intensity relations improves the differentiation. By NIR several im- portant contents (H 2 O, sugars, acids, etc.) of the surface tissue cells are measured, whereas thermography determines the plant transpiration.
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    Possibilities and Limits of the Use of Thermography for the Examination of Horticultural Products
    (2000) Linke, Manfred; Beuche, Horst; Geyer, Martin; Hellebrand, Hans Jürgen
    As a result of complicated heat- and substance exchange processes be- tween the produce and the environment after harvest, the temperature on the surface of fruit and vegetables is generally lower than the air tem- perature. Infrared thermography systems allow the distribution of these surface temperatures to be measured. Temperature differences are made visible in the form of colour differences and evaluated with methods of computer image analysis. The present contribution shows the possibili- ties and limits of the use of thermal imaging systems for examinations of quality changes of horticultural produce at the postharvest stage. In principle, such thermal imaging systems are able to measure produce properties connected with thermal processes (transpiration, respiration). They may lead to qualitatively new insights and thus make a contribution towards quality maintenance. When interpreting the results, the interrelation between the produce and its environment must always be taken into account.