Using Enclosures; Figure 13: Camera In Enclosure Configuration (With And W/O Window); Figure 14: Temperature Accuracy Improvement Using An Enclosure - Teledyne FLIR A68 Series User Manual

thermal cameras are generally mounted inside a box (enclosure) with an IR
transparent window.

Using Enclosures

Avoid mounting conditions and enclosures which expose the camera to asymmetric
heating from systems and other heat sources. If air cooling is present in the system,
airflow should be directed away from the camera/lens/window and as much as possible
be constant and symmetric around the optical line of sight. Also, the presence of these
external heat sources or fans will cause the camera to require an offset (reference
level) to the measurements.

Figure 13: Camera in Enclosure Configuration (with and w/o window)

The enclosure acts as a thermal stabilizer such that external airflow/ambient
temperature change do not directly reach the camera and slows down temperature
evolution around the camera. The result is a stable camera environment resulting in
better temperature accuracy.

Figure 14: Temperature Accuracy Improvement Using an Enclosure

FLIR A68/A38 Series IR Camera User's Manual Features and Configuration Options • 49