Figure 12: Influence Of Airflow On Temperature Accuracy - Teledyne FLIR A68 Series User Manual

However, NUC correction considers the deltas between the camera's different
component's temperatures (lens/shutter/mechanics/sensor). Significant changes to the
thermal connection of the camera to the environment or in airflow around the camera
will affect the signal coming from these parts and can require an adjustment of the
reference level of measurements. This is not pronounced for imaging applications, but
when very accurate temperature measurement is needed this contribution should be
considered.
Note: The term "Correction" (such as in Non-Uniformity Correction) is
related to the pixel-to-pixel correction necessary for good image quality.
This correction manages the pixel-to-pixel differences by applying a gain
and offset to each pixel, resulting in a uniform image of a uniform scene
over an operating temperature range minimizing spatial noise.
"Calibration" is related to the conversion between the sensor output (DN)
and the scene temperature. There is no direct relation between the pixel-
to-pixel correction and the temperature calibration.
In such conditions, the camera is quite sensitive to ambient temperature change as
shown in Figure 4.
For best results, the camera should be isolated from the thermal effects of window
heaters, variable fans and other intermittent thermal drifts (for example, air
conditioning, windows, doors). Due to these external environmental fluctuations,
48 • Features and Configuration Options

Figure 12: Influence of Airflow on Temperature Accuracy

FLIR A68/A38 Series IR Camera User's Manual