|
Term |
Definition |
|---|---|
|
Absorption and emission
1
|
The capacity or ability of an object to absorb incident radiated energy is always the same as the capacity to emit its own
energy as radiation
|
|
Apparent temperature
|
uncompensated reading from an infrared instrument, containing all radiation incident on the instrument, regardless of its
sources
2
|
|
Color palette
|
assigns different colors to indicate specific levels of apparent temperature. Palettes can provide high or low contrast, depending
on the colors used in them
|
|
Conduction
|
direct transfer of thermal energy from molecule to molecule, caused by collisions between the molecules
|
|
Convection
|
heat transfer mode where a fluid is brought into motion, either by gravity or another force, thereby transferring heat from
one place to another
|
|
Diagnostics
|
examination of symptoms and syndromes to determine the nature of faults or failures
3
|
|
Direction of heat transfer
4
|
Heat will spontaneously flow from hotter to colder, thereby transferring thermal energy from one place to another
5
|
|
Emissivity
|
ratio of the power radiated by real bodies to the power that is radiated by a blackbody at the same temperature and at the
same wavelength
6
|
|
Energy conservation
7
|
The sum of the total energy contents in a closed system is constant
|
|
Exitant radiation
|
radiation that leaves the surface of an object, regardless of its original sources
|
|
Heat
|
thermal energy that is transferred between two objects (systems) due to their difference in temperature
|
|
Heat transfer rate
8
|
The heat transfer rate under steady state conditions is directly proportional to the thermal conductivity of the object, the
cross-sectional area of the object through which the heat flows, and the temperature difference between the two ends of the
object. It is inversely proportional to the length, or thickness, of the object
9
|
|
Incident radiation
|
radiation that strikes an object from its surroundings
|
|
IR thermography
|
process of acquisition and analysis of thermal information from non-contact thermal imaging devices
|
|
Isotherm
|
replaces certain colors in the scale with a contrasting color. It marks an interval of equal apparent temperature
10
|
|
Qualitative thermography
|
thermography that relies on the analysis of thermal patterns to reveal the existence of and to locate the position of anomalies
11
|
|
Quantitative thermography
|
thermography that uses temperature measurement to determine the seriousness of an anomaly, in order to establish repair priorities
12
|
|
Radiative heat transfer
|
Heat transfer by the emission and absorption of thermal radiation
|
|
Reflected apparent temperature
|
apparent temperature of the environment that is reflected by the target into the IR camera
13
|
|
Spatial resolution
|
ability of an IR camera to resolve small objects or details
|
|
Temperature
|
measure of the average kinetic energy of the molecules and atoms that make up the substance
|
|
Thermal energy
|
total kinetic energy of the molecules that make up the object
14
|
|
Thermal gradient
|
gradual change in temperature over distance
15
|
|
Thermal tuning
|
process of putting the colors of the image on the object of analysis, in order to maximize contrast
|