InfraTec VARIOCAM HD, User Manual

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Thermography System VarioCAM ® HD
9 . Introduction
User Manual © InfraTec GmbH 2016 63
9.3.4 Menu item "Correction"
The "Correction" menu item can be used in order to enter the correction parameters emissivity and
ambient temperature, as well as path temperature, relative humidity, transmission and distance in
accordance with the current measuring situation. These values are stored with each thermal image and
can be displayed and changed, if required, during subsequent editing of the thermograms using the
IRBIS
® 3 analysis software.
Taking into consideration the real measuring conditions, particularly the:
■ Surface properties of an measuring object and the temperature level of the environment
■ Transmission of the optical channel, path temperature and distance.
The parameters emissivity and ambient temperature, as well as path temperature, relative humidity,
transmission, and distance allow for precise temperature measurement. In order to properly enter the
respective correction parameters, exact knowledge of the real properties of the measuring object, as well
as of the ambient conditions and the measurement setup is required. The correction parameters are
accepted globally for the entire image.
Fig. 144 Menu item "Correction" Fig. 145 Settings "Correction"
The VarioCAM ® HD works with a wavelength range of (7.5 … 14) µm. The influence of the
atmosphere on the measurement result can be neglected during the majority of the measurements
in this range – therefore, the transmission degree is set to 1.00 ex factory. Only in the event of
measurements over longer distances (over approx. 100 m) and/or through additional window
materials, gases and fog, will the transmission decrease and the path temperature, the relative
humidity and/or transmission (dew), and distance should be defined and taken into consideration.
The option "Materials" provides an alphabetically sorted collection of the emissivity of different materials,
within the framework of which the different surface conditions are partially taken into consideration. When
material and condition (status) are selected, the emissivity of the selected material is accepted as global
emissivity.
Fig. 146 Material table – material selection Fig. 147 Material table – condition/”status”
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