Glossary
17
IFOV Instantaneous field of view: A measure of the geometrical resolution
of an IR camera.
image correc-
tion (internal or
external)
A way of compensating for sensitivity differences in various parts of
live images and also of stabilizing the camera.
infrared Non-visible radiation, having a wavelength from about 2–13 μm.
IR infrared
isotherm A function highlighting those parts of an image that fall above, below
or between one or more temperature intervals.
isothermal
cavity
A bottle-shaped radiator with a uniform temperature viewed through
the bottleneck.
Laser LocatIR An electrically powered light source on the camera that emits laser ra-
diation in a thin, concentrated beam to point at certain parts of the ob-
ject in front of the camera.
laser pointer An electrically powered light source on the camera that emits laser ra-
diation in a thin, concentrated beam to point at certain parts of the ob-
ject in front of the camera.
level The center value of the temperature scale, usually expressed as a
signal value.
manual adjust A way to adjust the image by manually changing certain parameters.
NETD Noise equivalent temperature difference. A measure of the image
noise level of an IR camera.
noise Undesired small disturbance in the infrared image
object
parameters
A set of values describing the circumstances under which the meas-
urement of an object was made, and the object itself (such as emis-
sivity, reflected apparent temperature, distance etc.)
object signal A non-calibrated value related to the amount of radiation received by
the camera from the object.
palette The set of colors used to display an IR image.
pixel
Stands for picture element. One single spot in an image.
radiance Amount of energy emitted from an object per unit of time, area and
angle (W/m
2
/sr)
radiant power Amount of energy emitted from an object per unit of time (W)
radiation The process by which electromagnetic energy, is emitted by an object
or a gas.
radiator A piece of IR radiating equipment.
range
The current overall temperature measurement limitation of an IR cam-
era. Cameras can have several ranges. Expressed as two blackbody
temperatures that limit the current calibration.
reference
temperature
A temperature which the ordinary measured values can be compared
with.
reflection The amount of radiation reflected by an object relative to the received
radiation. A number between 0 and 1.
#T559770; r. AF/30726/30726; en-US
111
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