InfraTec VarioCAM User Manual page 54

by markers at the ROIs by "Delta". Accordingly, heating will display positive temperature differences,
cooling will display negative values.
Menu item "Differences" – "Locale" measures the temperature differences between several ROIs.
Thereby, the temperature of ROI 1 (absolute) is displayed, the respective difference to the temperature of
ROI 1 for any further ROIs (see Fig. 98). The activated measurement of local temperature differences is
marked by "Delta" at ROIs of No. > 1; however, ROI 1 is not marked in that way.
The current temperature differences are displayed either in the measurement value table (below the
colour scale) or directly at the ROI (more than five ROI* or hidden measurement value table acc. to Menu
"Image", menu item "Image elements", Fig. 63, Dialogue "Image elements", page 37).
Menu items
"Emissivity..", "Env.temp..", "Path temperature..", "Transmissivity..", "Distance.."
Parameters Emissivity and Environmental temperature as well as Path temperature, Transmissivity and
Distance provide for precise temperature measurement, taking into account real measuring conditions,
especially:
■ the surface properties of the object to be measured and the ambient temperature level
■ the transmissivity of the optical channel, the path temperature and distance.
Correct input of the respective correction parameters requires exact knowledge of the real properties of
the object to be measured as well as of ambient conditions and of the measurement setup. The correction
parameters are adopted for the entire image.
The five menu items "Emissivity..", "Env.temp..", "Path temperature..", "Transmissivity.." and
"Distance.." can be used to set the respective parameters for the current scene. When selecting a menu
item, an appropriate dialogue will open to allow to enter the desired value. By means of the joystick, the
value can then be altered. Pressing Enter accepts the value. These values are saved with each thermal
image and can be displayed and, if necessary, changed when later processing the thermograms by
means of the analysis software IRBIS
Fig. 99 Menu "Measure" - "Emissivity.."
The standard setting of Emissivity is 1.00. This assumes that 100% of the radiation measured is irradiated
by the measured object itself. The measured object represents the "ideal black body radiator" and does not
reflect.
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User Manual for the Thermographic System VarioCAM
®
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Fig. 100
© InfraTec GmbH 2013
Dialogue "Emissivity"
® high resolution
8. Operation
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