UV Glossary
9-2
Part 1061253B
E 2006 Nordson Corporation
capacitor Corrects the power factor in the main power supply to reduce current
levels in the UV system.
cold mirror A reflector that is coated with a dichroic material that absorbs or
passes wavelengths in the infrared range while reflecting those in the
UV range. Refer to dichroic.
cover The upper half of the lamp head assembly or the sheet metal top of
the power supply. In the lamp head, the cover contains openings and
baffles through which cooling air passes.
cradle Supports the UV bulb and reflector inside an electrode lamp head
housing.
cross hatch test Refer to tape test.
cure A UV drying process that occurs through a chemical reaction between
a UV ink or coating and UV light.
cure length Refer to effective cure length.
dichroic A coating designed to pass certain wavelengths and reflect other
wavelengths. In UV lamp heads, dichroics are used on reflectors to
pass or absorb infrared energy and reflect UV energy.
devitrification The act of making quartz glass opaque and porous through prolonged
heating and UV exposure.
doped bulb Refer to additive bulb.
dose (dosage) Refer to energy density.
dose rate (dosage rate) Refer to irradiance.
Dual Concentrated Focus
(DCF)
An electrode system where two bulbs and two angled reflectors are
positioned within one cradle. The UV light in a DCF system is
concentrated into a single band of energy.
dynamic exposure Exposure to a varying irradiance. It occurs when a lamp head passes
over a substrate without pausing or when a substrate passes under a
lamp head without pausing.
