optris BR 20AR, Operator'S Manual

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The BR 20 radiator can be mounted either on a ceiling or on a wall. An advantage of the radiator is its size.
This means that it can be set up at almost any distance from the camera and the object to be measured. It is
only important that the reference measuring area has a minimum size of 8x8 pixels and that the radiator is
within the field of view of the camera. The ambient temperature for the radiator should be the same as that of
the person to be measured. Installation close to a window or an air conditioning system should be avoided, as
the air flow can have an effect on the measurement.
The camera is focused on the person to be measured. If the radiator is at a great distance from the object, it
may also be out of focus in the image. This has no effect on the measurement, as it is an ambient radiator that
is in the same ambient temperature as the object. The person or persons to be measured must be within the
depth of field (DOF) range of the camera (
Figure 5 ).
Figure 5: Depth of Field (DOV)