Glossary - FLIR T420 User Manual

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Glossary

absorption The amount of radiation absorbed by an object relative to the re-
(absorption ceived radiation. A number between 0 and 1.
factor)
atmosphere The gases between the object being measured and the camera, nor-
mally air.
autoadjust A function making a camera perform an internal image correction.
autopalette The IR image is shown with an uneven spread of colors, displaying
cold objects as well as hot ones at the same time.
blackbody Totally non-reflective object. All its radiation is due to its own
temperature.
blackbody An IR radiating equipment with blackbody properties used to cali-
radiator brate IR cameras.
calculated at- A transmission value computed from the temperature, the relative
mospheric humidity of air and the distance to the object.
transmission
cavity radiator A bottle shaped radiator with an absorbing inside, viewed through
the bottleneck.
color The temperature for which the color of a blackbody matches a spe-
temperature cific color.
conduction The process that makes heat diffuse into a material.
continuous
A function that adjusts the image. The function works all the time,
adjust continuously adjusting brightness and contrast according to the im-
age content.
convection Convection is a heat transfer mode where a fluid is brought into mo-
tion, either by gravity or another force, thereby transferring heat from
one place to another.
dual isotherm An isotherm with two color bands, instead of one.
emissivity The amount of radiation coming from an object, compared to that of
(emissivity a blackbody. A number between 0 and 1.
factor)
emittance Amount of energy emitted from an object per unit of time and area
(W/m 2 )
environment Objects and gases that emit radiation towards the object being
measured.
estimated at- A transmission value, supplied by a user, replacing a calculated one
mospheric
transmission
external optics Extra lenses, filters, heat shields etc. that can be put between the
camera and the object being measured.
filter A material transparent only to some of the infrared wavelengths.
FOV Field of view: The horizontal angle that can be viewed through an IR
lens.
FPA Focal plane array: A type of IR detector.
graybody An object that emits a fixed fraction of the amount of energy of a
blackbody for each wavelength.
IFOV Instantaneous field of view: A measure of the geometrical resolution
of an IR camera.
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