Explanation
Term or expression
Amount of energy emitted from an object per unit of time
and area (W/m
2
)
emittance
A transmission value, supplied by a user, replacing a calculat-
ed one
estimated atmospheric transmis-
sion
Extra lenses, filters, heat shields etc. that can be put between
the camera and the object being measured.
external optics
A material transparent only to some of the infrared wave-
lengths.
filter
Field of view: The horizontal angle that can be viewed
through an IR lens.
FOV
Focal plane array: A type of IR detector.
FPA
An object that emits a fixed fraction of the amount of energy
of a blackbody for each wavelength.
graybody
Instantaneous field of view: A measure of the geometrical
resolution of an IR camera.
IFOV
A way of compensating for sensitivity differences in various
parts of live images and also of stabilizing the camera.
image correction (internal or exter-
nal)
Non-visible radiation, having a wavelength from about 2–13
μ
m.
infrared
infrared
IR
A function highlighting those parts of an image that fall
above, below or between one or more temperature intervals.
isotherm
A bottle-shaped radiator with a uniform temperature viewed
through the bottleneck.
isothermal cavity
An electrically powered light source on the camera that emits
laser radiation in a thin, concentrated beam to point at certain
parts of the object in front of the camera.
Laser LocatIR
An electrically powered light source on the camera that emits
laser radiation in a thin, concentrated beam to point at certain
parts of the object in front of the camera.
laser pointer
The center value of the temperature scale, usually expressed
as a signal value.
level
A way to adjust the image by manually changing certain
parameters.
manual adjust
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