The work describes a method for the determination of the conversion by radical
photopolymerization of acrylic coatings that is suitable for an in situ monitoring during the
coating process. The applied method is based on the 1620 nm overtone absorption of the acrylate
end group. The capability of the sensor to discriminate between polymerized and unpolymerized
coatings on metal substrates down to a coating thickness of less than 16µm is demonstrated and
and proved by reference measurements.
