UV Glossary
9-8
Part 1061253B
E 2006 Nordson Corporation
reflector Reflect and concentrate the UV light onto the substrate. Rolled from
highly polished aluminum sheet metal or formed from borosilicate into
elliptical or parabolic profiles. Elliptical profiles optimize the
concentration of UV energy that is reflected by guiding the radiation
into a tightly focused UV band while parabolic reflectors result in a
flood of UV light. Holes or slots in the reflector allow cooling air to
pass through. The holes or slots are engineered for size and location
to provide both optimal and balanced airflow across the length of the
bulb.
remote cooling fan (blower) The cooling fan when it is mounted separate from the lamp head and
ducted in to the lamp head.
RF Radio Frequency. Any frequency between normally audible sound
waves and the infrared light portion of the spectrum lying between
10 KHz and 1,000,000 MHz.
RF detector Monitors RF levels in the vicinity of the UV system and signals the
power supply to shut off the UV if RF levels exceed allowable limits.
screen A wire mesh assembly attached to a microwave lamp head that allows
UV to pass through but prevents RF from leaking from the unit.
short UV Refer to UVC.
single An electrode lamphead assembly with a cradle that supports only one
bulb and one reflector.
shutter An assembly designed to block UV light while passing cooling air.
solarization The effect of the UV light on the quartz bulb. Over time, UV light and
heat will cause the quartz to devitrify or revert back to a crystalline and
porous state.
spectral output The various wavelengths of light emitted from a UV bulb.
spectral output efficiency
graph
A graph or chart showing the relative concentration of UV at various
wavelengths for a particular bulb type. Typically, the concentration is
provided as a normalized percentage where the energy is integrated
over 10-nanometer bands to reduce the difficulty of quantifying the
effects of line emission spectra.
starter Used in electrode, ballast-based systems to vaporize the mercury.
The starter puts a 3,000-4,000 volt potential across the bulb during
start up and has an internal circuit that discontinues the potential when
current is established.
