Because of variations in thermal conductivity, objects (surrounding environment,
background) under observation become warm more quickly at above-zero
temperatures, which allows higher temperature contrast, so the quality of the
image produced by a thermal imager will be better.
At low operating temperatures, objects under observation (background) normally
cool down to roughly identical temperatures, which leads to reduced temperature
contrast and to image quality (precision) degradation. This is normal for thermal
imaging devices.
The image of the object being observed is missing
Possible cause
You are looking through glass.
Solution
Remove the glass or change the viewing position to avoid it.
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