Method for spectroscopically monitoring resin applied to a planar surface
of veneer-wood sheets during travel in an assembly line. Spectroscopic instrumentation
for monitoring applied resin is calibrated by measurements of predetermined resin
applications to reference-test-samples, so as to provide a pre-determined relationship
enabling monitoring of applied resin, during commercial production of a veneer-wood
product using the visible light spectrum and near infrared extending to 2500 nm.
Monitoring of selected radiation absorbance by the applied resin is carried out
by spectroscopic measurement of non-absorbed electromagnetic radiation, as reflected
back by the wood-veneer matrix; selected wavelengths are utilized for determining
average resin-weight per designated surface area of a sheet. Selecting penetrative
wavelengths enables use of multiple types of hardwood and softwood for veneer sheets
during in-line production, providing for separate calibration for selected wood
type and resin combinations measuring instrumentation.