Apogee MQ-650 Panduan Pemilik - Halaman 8

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Cosine Response

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.