InfraTec VARIOCAM HD, User Manual

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Thermography System VarioCAM ® HD
9 . Introduction
User Manual © InfraTec GmbH 2016 71
For the evaluation of recordings made with the Eversharp/ multi-focus function, the analysis
software IRBIS® 3 is necessary since the calculation of the deep sharp thermograms is only
possible with this PC software. A display of the corrected thermograms with VarioCAM
® HD is not
possible!
9.4.4 Menu item "Compensation"
In order to implement the specified measurement accuracy, the VarioCAM ® HD performs an internal
compensation (factory setting). In this, the optical channel is closed for a short period of time by means of
a shutter. The shutter is part of the optomechanics. It is swiveled into the optical path for a short time as
reference.
Fig. 166 Menu item
"Compensa
tion"
Fig. 167 Compensation settings Abb. 168 Einstellungen "Abgleich"
Empfindlichkeit
In the Shutter  Interval mode, the interval for an automatic compensation can be set (see also Fig.
167). For this, the time after which an automatic compensation is to be performed must be entered in
seconds. The limitations for the interval to be specified are between 5 sec and approx. 16 min (995 sec).
Once the entered value exceeds or falls below these limits it is adapted automatically. The recommended
factory setting is 60s. Immediately after start-up of the VarioCAM
® HD the shutter interval is adapted
automatically by the internal camera control depending on the change of the device temperature over the
course of the first 5 minutes. During this time, the time specified for the "Intervall" option is ineffective.
In the Shutter
"Automatic" mode, the parameter “ sensitivity”, depending on the measurement situation
and requirements, can be set up in the stages “strong”, “medium” or “weak”: for maximum accuracy, but
at the expense of shorter compensation intervals, the sensitivity level “strong” can be chosen. Here, very
small changes of the camera temperature already lead to compensation. If short compensation intervals
are not desired due to the short interruption in data transfer, the sensitivity level can be adjusted to
“medium” or “weak” with less measuring accuracy. Therefore, only medium to bigger changes in camera
temperature lead to compensation and the compensation interval is extended.
The VarioCAM
®
HD’s specified measurement accuracy requires the compensation interval
"Automatic" or "Interval" (compensation interval of a maximum of 60 s).
When switching the compensation to the "Object" option, the function is referenced to the current scene.
As a consequence, this results in a differential representation referring to the scene present at the
moment of compensation. This way, it is possible to visualise very small changes in temperature even
with comparatively high scene dynamics.
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