FLIR ix Series User Manual page 91

21 – The measurement formula
10400703;a2
Figure 21.4 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
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Publ. No. T559733_en-US Rev. a571 – ENGLISH (EN) – November 4, 2011