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EN 24
Operating manual – thermal imaging camera IC085LV / IC125LV
Thermography terms
Span (contrast)
If the temperatures in the image are homogenously distributed
and close together, the image might not be very colourful /
contrasty, and the contours might not be easily visible. To
increase the image's contrast, press the up or down button of
the central menu keyboard. This increases or reduces the
temperature range set. The representation of individual thermal
areas in the image changes and becomes more contrasty.
Level (average temperature / temperature level /
brightness)
When changing the span (see Span), it often makes sense to
also adjust or shift the average temperature (Level). If, for
instance, the span is reduced to a minimum first and then the
level of this extremely narrowed temperature range is shifted
up/down, the image will become useless even in parts as it will
either have a totally excessive or insufficient contrast. However,
this allows you to visualize even the smallest temperature
differences in the object when traversing the individual
temperature sections.
Emission
Any object whose temperature lies above absolute
zero (-273.15°C) emits heat radiation. Its surface condition
(e.g. colour, structure, material composition etc.) and
temperature, among other things, determine how well the heat
is emitted. The emissivity of an object indicates who much heat
it radiates compared to an ideal black body. An ideal black body
has a theoretical emissivity of 1. Other factors such as
transmission and reflection can be neglected in this ideal case.
In practice, however, this is not possible. Surfaces that strongly
reflect in the visible light spectrum are often also highly
reflective in the infrared spectral range, as is the case with
polished aluminium for instance.
The formula is: transmission + reflection + emission = 1
In most cases, the transmission factor can be neglected. If the
surface to be thermographed is highly reflective, the share of
reflection increases correspondingly and the share of emission
decreases.
Example:
transmission = 0
reflection = 0.8
emission = 0.2
Highly reflective surfaces reflect all temperatures whatsoever
from surrounding heat sources, which are thus indirectly
captured and measured by the thermal imaging camera, while
the surface temperature of the actual measuring object is not
being measured. To overcome this problem, special labels or
sprays with a high defined emissivity are often applied on the
surface to be measured.
The general rule is: The higher the emissivity, the lower the
reflectance, the easier the thermography.
Reflected temperature
The location of heat sources in the surroundings influencing the
measurement and the determination of the average temperature
which is emitted by them and can be reflected by the object to
be thermographed.
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