Determining the emissivity of the leaves of nine horticultural crops by means of infrared thermography
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López Martínez, Alejandro![University of Almería authority University of Almería authority](/themes/Mirage2/images/autoridades/autoridad.png)
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Date
2001-01-18Abstract
he present study was carried out with the aim of analysing the variability of the emissivity values of nine of the most characteristic horticultural crops of the greenhouse productive system in the Mediterranean region. A thermographic camera was used for both qualitative and quantitative emissivity measurement by evaluating radiation emission from the leaves. The real temperature of the leaves was also measured with a contact probe in order to calculate emissivity. The differences in emissivity between crops for the upper side of leaves are below standard deviation values, the average values are all close to 0.98. For upper side of leaves we obtained the following average values of emissivity: 0.980 ± 0.010 for Lycopersicum esculentum Mill., 0.978 ± 0.008 for Capsicum annuum L., 0.983 ± 0.008 for Cucumis sativus L., 0.985 ± 0.007 for Cucurbita pepo L., 0.973 ± 0.007 for Solanum melongena L., 0.978 ± 0.006 for Cucumis melo L., 0.981 ± 0.009 for Citrullus lanatus Thunb., 0.983 ± 0.006 f...