Directional (cosine) response is defined as the
measurement error at a specific angle of radiation
incidence. Error for Apogee MQ-500 series quantum
sensors is approximately ± 2 % and ± 5 % at solar zenith
angles of 45° and 75°, respectively.
Mean directional (cosine) response of
seven apogee MQ-500 series
quantum sensors. Directional
response measurements were made
on the rooftop of the Apogee
building in Logan, Utah. Directional
response was calculated as the
relative difference of MQ-500
quantum sensors from the mean of
replicate reference quantum sensors
(LI-COR models LI-190 and LI-190R,
Kipp & Zonen model PQS 1). Data
were also collected in the laboratory
using a reference lamp and
positioning the sensor at varying
angles.
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