Term
Definition
Absorption and emission
3
The capacity or ability of an object to absorb incident radi-
ated energy is always the same as the capacity to emit its
own energy as radiation
Apparent temperature
uncompensated reading from an infrared instrument, con-
taining all radiation incident on the instrument, regardless of
its sources
4
Color palette
assigns different colors to indicate specific levels of apparent
temperature. Palettes can provide high or low contrast, de-
pending 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, ei-
ther 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
5
Direction of heat transfer
6
Heat will spontaneously flow from hotter to colder, thereby
transferring thermal energy from one place to another
7
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
8
Energy conservation
9
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 (sys-
tems) due to their difference in temperature
Heat transfer rate
10
The heat transfer rate under steady state conditions is di-
rectly 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
11
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
12
Qualitative thermography
thermography that relies on the analysis of thermal patterns
to reveal the existence of and to locate the position of
anomalies
13
Quantitative thermography
thermography that uses temperature measurement to deter-
mine the seriousness of an anomaly, in order to establish re-
pair priorities
13
#T810206; r. AA/43064/43088; en-US
73
3. Kirchhoff’s law of thermal radiation.
4. Based on ISO 18434-1:2008 (en).
5. Based on ISO 13372:2004 (en).
6. 2nd law of thermodynamics.
7. This is a consequence of the 2nd law of thermodynamics, the law itself is more complicated.
8. Based on ISO 16714-3:2016 (en).
9. 1st law of thermodynamics.
10. Fourier’s law.
11. This is the one-dimensional form of Fourier’s law, valid for steady-state conditions.
12. Based on ISO 18434-1:2008 (en)
13. Based on ISO 10878-2013 (en).
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