ExplanationTerm or expression
The amount of radiation coming from an object,
compared to that of a blackbody. A number be-
tween 0 and 1.
emissivity (emissivity factor)
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 calculated one
estimated atmospheric transmission
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
wavelengths.
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 geo-
metrical resolution of an IR camera.
IFOV
A way of compensating for sensitivity differences
in various parts of live images and also of stabiliz-
ing the camera.
image correction (internal or external)
Non-visible radiation, having a wavelength from
about 2–13 μm.
infrared
infraredIR
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 tempera-
ture 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
15
106 Publ. No. 1558407 Rev. a155 – ENGLISH (EN) – February 6, 2006
15 – Glossary
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