For those interested in IR cam, this document is well made
http://www.optris.fr/telecharg…ds/Zubehoer/IR-Basics.pdf
it is done by the manufacturer of the Optris cam used by Lugano test.
IR cam are according toe the documentation array of microbolometers (FPA, field plane array bolometers), so they measure radiated heat in the chosen bandwidth, 7.5-13µm for our case.