Apogee Instruments SIF-1H1 Owner's Manual - Page 7
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Spectral Response
Spectral response of SIF series
infrared radiometers. Spectral
response (green line) is determined
by the germanium filter and
corresponds closely to the
atmospheric window of 8 to 14 µm,
minimizing interference from
atmospheric absorption/emission
bands (blue line) below 8 µm and
above 14 µm. Typical terrestrial
surfaces have temperatures that
yield maximum radiation emission
within the atmospheric window, as
shown by the blackbody curve for a
radiator at 28 C (red line).