UV Glossary
9-3
Part 1061253B
E 2006 Nordson Corporation
dynamic range The span between the minimum irradiance and the maximum
irradiance to which a radiometer will accurately respond. Measured in
joules/cm
5
.
effective cure length The length of a bulb that delivers optimal UV output. For electrode
bulbs, the effective cure length is always less than the arc length. For
microwave bulbs, the effective cure length is the length of the bulb.
electrode The electrical fitting on the inside of an arc bulb. The electrode
consists of a tungsten pin surrounded by a tungsten coil and is used to
maintain a voltage arc across the bulb. Electrode is also used to refer
to the style of bulb or system when differentiating between microwave
and electrode bulbs and microwave and electrode systems.
electrodeless A microwave-powered UV system.
electromagnetic spectrum The full wavelength range of electromagnetic radiation, including
microwave, ultraviolet, visible, and infrared energy.
energy density The total amount of UV energy delivered to a particular area,
measured in joules/cm
2
. Also referred to as total energy. Improperly
referred to as dose.
erythermal UV Low-powered UV in the UVC 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 erythermal UV products.
flood An unfocused band of UV light that is more evenly and diffusely
distributed across the width of the reflector.
flux The flow of photons, measured in einsteins/second.
focal distance (length) The perpendicular distance from the edge of the lamp head to the
point where the UV light emitting from the bulb converges. This is the
location of maximum UV concentration.
focus The band where the UV energy reflected from the lamp head is at the
highest concentration.
frequency The number of times a periodic wavelength cycle occurs in one
second, measured in Hertz (Hz).
