FLIR B series User Manual page 246

34 – The measurement formula
10400703;a2
Figure 34.4 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. 1558792 Rev. a460 – ENGLISH (EN) – July 1, 2010