FLIR A3 SERIES Installation Manual page 89

22 – The measurement formula
10400703;a2
Figure 22.4 Relative magnitudes of radiation sources under varying measurement conditions (LW camera).
1: Object temperature; 2: Emittance; Obj: Object radiation; Refl: Reflected radiation; Atm: atmosphere
radiation. Fixed parameters: τ = 0.88; T = 20°C (+68°F); T = 20°C (+68°F).
refl atm
83
Publ. No. T559498 Rev. a461 – ENGLISH (EN) – August 19, 2010