Directional, or cosine, response is defined as the
measurement error at a specific angle of radiation
incidence. Error for Apogee MQ-600 series ePAR
Sensor is approximately ± 2 % and ± 5 % at solar
zenith angles of 45° and 75°, respectively.
Mean directional (cosine)
response of seven Apogee 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 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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