ExplanationTerm or expression
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 geometrical reso-
lution 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 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 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 param-
eters.
manual adjust
Noise equivalent temperature difference. A measure of the image
noise level of an IR camera.
NETD
Undesired small disturbance in the infrared imagenoise
A set of values describing the circumstances under which the
measurement of an object was made, and the object itself (such
as emissivity, ambient temperature, distance etc.)
object parameters
17
122 Publ. No. 1557978 Rev. a155 – ENGLISH (EN) – February 6, 2006
17 – Glossary
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