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15 – Glossary
Term or expression
emissivity (emissivity factor)
emittance
estimated atmospheric transmission
external optics
filter
FOV
FPA
graybody
IFOV
image correction (internal or external)
infrared
IR
isotherm
isothermal cavity
Laser LocatIR
laser pointer
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106
Explanation
The amount of radiation coming from an object,
compared to that of a blackbody. A number be-
tween 0 and 1.
Amount of energy emitted from an object per unit
2
of time and area (W/m
)
A transmission value, supplied by a user, replacing
a calculated one
Extra lenses, filters, heat shields etc. that can be
put between the camera and the object being
measured.
A material transparent only to some of the infrared
wavelengths.
Field of view: The horizontal angle that can be
viewed through an IR lens.
Focal plane array: A type of IR detector.
An object that emits a fixed fraction of the amount
of energy of a blackbody for each wavelength.
Instantaneous field of view: A measure of the geo-
metrical resolution of an IR camera.
A way of compensating for sensitivity differences
in various parts of live images and also of stabiliz-
ing the camera.
Non-visible radiation, having a wavelength from
about 2–13 μm.
infrared
A function highlighting those parts of an image
that fall above, below or between one or more
temperature intervals.
A bottle-shaped radiator with a uniform tempera-
ture viewed through the bottleneck.
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.
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.
Publ. No. 1558146 Rev. a156 – ENGLISH (EN) – February 28, 2006
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