FLIR T640 - Page 499

The measurement formula
34
Figure 34.3 Relative magnitudes of radiation sources under varying measurement conditions (LW cam-
era). 1: Object temperature; 2: Emittance; Obj: Object radiation; Refl: Reflected radiation; Atm: atmos-
phere radiation. Fixed parameters: τ = 0.88; T
refl
= 20°C (+68°F); T
atm
= 20°C (+68°F).
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