UV Glossary
9-5
Part 1061253B
E 2006 Nordson Corporation
irradiator Refer to lamp head.
joule Metric unit for measuring work or energy. One joule is equivalent to
the work done by a force of one Newton acting through a distance of
one meter. (1 KW-hour equals 3.6 x 10
6
joules).
lamp Refer to bulb.
lamp head Assembly containing a sheet metal housing and cover and integral or
remote cooling fan. An electrode system also contains cradles and a
microwave system contains magnetrons, a cavity, and a screen.
light detector A photocell inside a microwave lamp head that confirms UV output.
long UV Refer to UVA.
louver A part of a UV shutter system or shielding section that blocks the UV
light while allowing cooling air to pass through.
magnetron Assembly contained inside a microwave lamp head that converts
high-voltage electrical input into RF energy.
mercury A silver-white metallic element that is liquid at room temperature and is
used to create a vaporized, UV-emitting gas plasma inside a quartz
tube when it is energized through the use of either a voltage arc or
microwave energy. When energized the bulb produces a bright white
UV output. Mercury bulbs have a peak spectral output around 365 nm
and a concentration around 254 nm. In some industries, mercury
bulbs are referred to as H bulbs.
mercury plus (H+) Microwave bulbs that contain additional mercury. Mercury plus bulbs
are only available in microwave systems as it is difficult to vaporize the
additional mercury in an electrode bulb.
mercury arc An electric discharge passed between two electrodes and through a
mercury vapor medium inside a quartz tube.
metal halide bulb Refer to additive bulb.
micrometer (mm) Unit of length equivalent to one millionth of a meter.
microwave That part of the electromagnetic spectrum associated with the larger
infrared waves and the shorter radio waves.
