How do I calculate Dose from a fixed point measurement?
A situation can occur where measurements of dose (in J/cm2) have been made using an integrating type radiometer on a conveyor in a laboratory at the process qualification stage, albeit with the knowledge that the calibration of the radiometer may not be correct for the part of the spectrum of interest. Moving on into pilot production, or full scale production in, say, a sheet fed or web type printing applications (one of the most common and well established UV curing applications) one finds it impossible to apply the integrating radiometer it simply cannot be passed through under the UV lamps of the web-press. Choices are much more limited, but fixed point measurements can be taken under the UV lamps on a sample basis to gauge the UV power and spectra. But how can we arrive at a dose measurement from a fixed point power measurement ? From measurements at different positions under the lamps it is possible to see various spatial responses from lamps – in focus or not well focussed. It is
