Apogee Instruments S2-432 Manuel du propriétaire - Page 7
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Cosine Response
Spectral Response
Directional, or cosine, response is defined as
the measurement error at a specific angle of
radiation incidence. Directional error for
Apogee S2 series Red - Far-red 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.