Apogee S2-131-SS Owner's Manual - Page 7
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Directional (Cosine) Response
Spectral Response
Directional (cosine) response is defined as the
measurement error at a specific angle of
radiation incidence. Error for Apogee S2
series red / far sensors is approximately ± 2 %
and ± 5 % at solar zenith angles of 45° and
75°, respectively.
Mean spectral response measurements
of six replicate red - far-red sensors (red
sensor is centered near 655 nm, far-red
sensor is centered near 730 nm).
Spectral response measurements were
made at 2 nm increments across a
wavelength range of 600 to 800 nm in a
monochromator with an attached
electric light source. Measured spectral
data from each sensor were normalized
by the measured spectral response of
the monochromator/electric light
combination, which was measured with
a spectroradiometer.