|Riassunto in Inglese:|
Study of wood chip sizes. Searching for a method based on image analysis. The size distribution of wood chips is recognized as one of the most important parameters for an
efficient combustion, since it affects the storage, the efficiency of energy conversion and environmental emissions. The standard method for the determination of the size distribution (UNI EN 15149-1:2011) may have a resolution and repeatability that can
be subject to a certain degree of variability and uncertainty. CRAING is conducting a research activity for developing a model, based on the image analysis, aimed at to define a scientific and objective method for the classification of wood particles, depending
on both size and shape. The first results, deriving from a comparison among the standard method, the image analysis and the hand-made measurement of particle size, have shown
that the standard technique (using vibrating sieves) is not devoid of inaccuracies that may lead to significant deviations from the real distribution of the particle size, whereas the use of image analysis assures a better approximation to the curve obtained from manual measurement. This is a preliminary work whose main objective will be, in the coming years, to shift from a twodimensional static method (which is the one studied so far) to a three-dimensional dynamic acquisition process (that is, with the transposition of the moving image), being the final goal the setting up of a fully automated system for product classification.