SYSTEM AND METHOD FOR THE DETECTION OF BLUESTAIN AND ROT ON WOOD

摘要

A system for detecting bluestain and rot in wood in a wood processing pla nt including a conveyor for conveying a piece of wood through a scanning area includes a scanning unit comprising a plurality of scanners arranged to scan a face of the piece of wood in a direction perpendicular to a conveying direction. Each of the scanners include a light for illuminating a point on the piece of wood; a collector for collecting light reflected from the piece of wood; a splitter for splitting the collected light into at least two beams; a filter for filtering out of each of the beams a wavelength associated with each of the beams, each of the wavelength s being different; a collector for collecting the filtered light, the collecto r being adapted to output a signal related to an intensity of the filtered light; an d a comparator for comparing the output of each of the collector, the comparator being adapted to output a signal when a ratio between the signal between each of t he collector exceeds a predetermined threshold.