First off, let me state that I'm not entirely sure this is the right forum for this question. This was the only section I found multiple questions pertaining to thermal imaging, however, so I thought I'd give it a try.
I have a FLIR Lepton camera that I am experimenting with, with the intention of using it outside.
I found this forum and someone was asking the same question. A few material types were suggested from the Lepton data brief, including “Common materials for LWIR windows include silicon, germanium, and zinc selenide”.
My main question is why do these materials work so well? How is it that they allow the transfer of thermal energy (not sure if I'm wording that the best way) while something like glass insulates and doesn't allow it? Are some of them better for certain applications, like outside?