ExplanationTerm or expression
The set of colors used to display an IR image.palette
Stands for picture element. One single spot in an image.pixel
Amount of energy emitted from an object per unit of time, area
and angle (W/m
2
/sr)
radiance
Amount of energy emitted from an object per unit of time (W)radiant power
The process by which electromagnetic energy, is emitted by an
object or a gas.
radiation
A piece of IR radiating equipment.radiator
The current overall temperature measurement limitation of an
IR camera. Cameras can have several ranges. Expressed as
two blackbody temperatures that limit the current calibration.
range
A temperature which the ordinary measured values can be
compared with.
reference temperature
The amount of radiation reflected by an object relative to the
received radiation. A number between 0 and 1.
reflection
Relative humidity represents the ratio between the current water
vapour mass in the air and the maximum it may contain in satu-
ration conditions.
relative humidity
The areas that contain temperatures outside the present lev-
el/span settings are colored with the saturation colors. The sat-
uration colors contain an ‘overflow’ color and an ‘underflow’
color. There is also a third red saturation color that marks every-
thing saturated by the detector indicating that the range should
probably be changed.
saturation color
The interval of the temperature scale, usually expressed as a
signal value.
span
Amount of energy emitted from an object per unit of time, area
and wavelength (W/m
2
/μm)
spectral (radiant) emittance
A value which is the result of a subtraction between two temper-
ature values.
temperature difference, or difference
of temperature.
The current overall temperature measurement limitation of an
IR camera. Cameras can have several ranges. Expressed as
two blackbody temperatures that limit the current calibration.
temperature range
The way in which an IR image currently is displayed. Expressed
as two temperature values limiting the colors.
temperature scale
infrared imagethermogram
Publ. No. T559498 Rev. a461 – ENGLISH (EN) – August 19, 2010 57
18 – Glossary
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