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Measurement errors of three generations (types) of thermographic cameras (Flir, Inc.). (a) AGA 782SW with 12 mm close-up extension ring (single InSb detector, liquid nitrogen cooled, 3.5–5.6 μm waveband); (b) SC2000 NTS (320 × 240 microbolometer focal plane array, 7–14 μm waveband) with 64/150 close-up lens, error usually (without close-up lens) smaller; (c) i60 handheld camera (180 × 180 microbolometer array, 7–14 μm waveband). Ta = ambient air temperature.
