FLIR T420-NIST User Manual page 135

31 – The measurement formula
10400603;a2
Figure 31.3 Relative magnitudes of radiation sources under varying measurement conditions (SW camera).
1: Object temperature; 2: Emittance; Obj: Object radiation; Refl: Reflected radiation; Atm: atmosphere
radiation. Fixed parameters: τ = 0.88; T
124
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= 20°C (+68°F); T
refl atm
Publ. No. T559772 Rev. a593 – ENGLISH (EN) – March 16, 2012
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= 20°C (+68°F).