KT-560M
– USER MANUAL
56
indicated by check mark icon
- the camera will save all data on this carrier. The
'Format SD card' option is used to format the SD card inserted in the camera.
Press ‘OK’
in the dialog box that will open to format the SD card
– all the data will be deleted.
Data synchronization
– click to synchronize the camera data.
Reset
– click and press OK in the displayed window to restore the default factory set-
tings of the camera.
12 Accurate temperature measurement
Temperature measurement accuracy depends mainly on the below factors. During the
measurements the camera undertakes corrections based on signals read from the sen-
sors. In some situations and for some materials it may be necessary to the adjustments
manually. It must be remembered that there are three basic measurement parameters,
that can't be changed after capturing an image:
-
Focus
– images that are out of focus are not only blurred, but also they don’t carry accu-
rate temperature indications,
-
Framing
– it is essential that an image is properly framed, so the object and all its neces-
sary parts are within the frame. Otherwise the picture may be of little or no use,
-
temperature range
– If the temperature of the object, or its part, exceeds the temperature
range that is set in the camera, it may not be possible to later determine the exact tempera-
ture of this area.
When all the above parameters have been considered, then the next important step is to
properly configure the measurement parameters. The following section is a simplified de-
scription of each parameter and their impact on the measurement results.
Emissivity.
Infrared measurements base on receiving the infrared radiation emitted by ob-
jects. The amount of radiation energy is based on two main factors: surface temperature and
emissivity of the object's surface. Considering that surrounding object are, in most cases, not
transparent for infrared radiation, to simplify the measurements, it is assumed that the radia-
tion that reaches the object is divided into:
- emitted - radiation emitted directly by the measured object,
- reflected - the ambient radiation reflected from the surface of the measured object.
For the camera, the sum of the emitted and reflected radiation equals 1. The ration of the re-
flected and the emitted radiation is described by the emissivity coefficient.
For example, if the emissivity is set to 0.2, then the camera (to put it in simple terms) as-
sumes that 20% of the radiation coming from the measured object is emitted by the object it-
self, and 80% is the reflected radiation. Considering the above, a special algorithms calcu-
late the correct surface temperature of the measured object.
Exemplary values of emissivity coefficient for selected materials are presented in the emis-
