Abstract: Method for monitoring the weight of glue sprayed on a veneer surface, where the light reflectance from droplet-covered regions on the surface differs from that of uncovered surface regions. According to the method, a beam of light is directed onto the sprayed surface of a relatively moving veneer, and the light reflectance from a zone within the illuminated surface area is detected to produce a signal which varies according to instantaneously detected reflected light level. A signal-handling circuit transforms the signal to a binary data stream composed of one and other data states representing reflected light levels from droplet-covered and uncovered regions on the surface, respectively. The data stream is processed to compute the weight of glue sprayed on the surface.

Abstract: Apparatus for monitoring the weight of glue sprayed on a veneer surface, where the light reflectance from droplet-covered regions on the surface differs from that of uncovered surface regions. A beam of light is directed onto the sprayed surface of a relatively moving veneer, and the light reflectance from a zone within the illuminated surface area is detected to produce a signal which varies according to instantaneously detected reflected light level. A signal-handling circuit in the apparatus transforms the signal to a binary data stream composed of one and other data states representing reflected light levels from droplet-covered and uncovered regions on the surface, respectively. The data stream is processed to compute the weight of glue sprayed on the surface.