Product manual

UV Glossary
9-1
Part 1105120-01
E 2013 Nordson Corporation
Section 9
UV Glossary
absorption Not reflecting. The partial loss in energy that results when light passes
through or reflects off a medium.
additive bulb A mercury bulb that contains metal additives such as iron, gallium,
indium, or others. These bulbs produce variations in spectral output as
compared to mercury only bulbs.
ASTM spec D3359−95a Refer to tape test.
black light UV Low powered UV composed of wavelengths in the UVA band. Usually
powered with several 100-watt power supplies or less instead of
several 1000-watt power supplies. Nordson’s UV Star and CoolWave
product lines are much higher in irradiance and energy density than
black light UV products.
bulb A sealed quartz tube that contains a mixture of inert gas and mercury
under medium pressure. Electrode bulbs are fitted with electrical
connections at the ends of the bulb. Microwave bulbs contain no
electrical connections. The mercury and inert gas are energized
(vaporized) by either a voltage arc or microwave energy. The
vaporized plasma gas emits UV light.
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.
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.
dichroic A coating designed to pass certain wavelengths and reflect other
wavelengths. In UV lampheads, 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.