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10400703;a2
Figure 20.4 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
refl
= 20°C (+68°F); T
atm
= 20°C (+68°F).
Publ. No. T559132 Rev. a449 – ENGLISH (EN) – April 21, 2010 91
20 – The measurement formula