UV Measurement & Process Control
UV Measurement & Process Control
UV Measurement & Process Control
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Are we speaking the same (<strong>UV</strong>) language?Irradiance (Intensity)• Expressed in watts or milliwatts per square centimeter(W/cm 2 or mW/cm 2 )• Total radiant power of (all) wavelengths passing from allincident directions onto an infinitesimally small area (cm 2 )• Depth of cure, penetration through pigments and opaquecolors, adhesion to the substrateRadiant Energy Density• Expressed in joules or millijoulesper square centimeter (J/cm 2 or mJ/cm 2 )• Incorporates time as part of the measurement• One watt for One second = One joule• Area under the irradiance curve• Often the only <strong>UV</strong> exposure guide number supplied• Important for total and complete cure of materialWavelength-Nanometers<strong>UV</strong> Glossary & Terminology: www.radtech.orgDoseIrradiancedAEnergy DensityTime
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