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Infrared Thermal Radiation
Infrared thermal radiation is electromagnet-
ic radiation emitted by every body above 0
Kelvin (-459°F, -273°C). The amount of ra-
diation depends on the temperature and the
emissivity of the body.
Emissivity Degree
The emissivity degree of an object depends
on the material and the structure of its
surface. It states how much infrared heat
radiation the object emits compared to an
ideal heat emitter (black body, emissivity
degree = 1).
Thermal Bridge
A thermal bridge is an object that undesir-
ably transmits heat outwards or inwards,
therefore differing significantly from the
temperature of the rest of a wall or from the
desired temperature of a wall.
Distance
11.9 in
(0.3 m)
1 ft 9.7 in
(0.55 m)
3 ft 3.4 in
(1.00 m)
6 ft 6.7 in
(2.00 m)
16 ft 4.9 in
(5.00 m)
Definitions
As the surface temperature at thermal bridg-
es is lower than in the rest of the room, the
risk of mold increases significantly at these
locations.
Reflected Temperature/
Reflectivity of an Object
The reflected temperature is the thermal
radiation that is not emitted by the object
itself. Depending on the structure and mate-
rial, background radiation is reflected in the
object to be measured, therefore distorting
the actual temperature result.
Distance from the Object
The distance between the object being mea-
sured and the measuring tool influences the
captured area size per pixel. You can capture
increasingly large objects as the distance
from the object becomes greater.
Size of infrared
pixels
0.03 in
(0.85 mm)
0.06 in
(1.56 mm)
0.11 in
(2.84 mm)
0.22 in
(5.69 mm)
0.56 in
(14.22 mm)
-12-
Infrared range
width × height
~8.7 in x 6.3 in
(~0.22 m x 0.16 m)
~1.3 ft x 1 ft 3.7 in
(~0.40 m x 0.29 m)
~28.7 in x 21.3 in
(~0.73 m x 0.54 m)
~4 ft 9.5 in x 3 ft 6 in
(~1.46 m x 1.07 m)
~11 ft 11.3 in x 8 ft 9.5 in
(~3.64 m x 2.68 m)
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