Apogee Instruments S2-441 Manuale d'uso - Pagina 7

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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 S2 series PAR-FAR sensors

is approximately ± 2 % and ± 5 % at solar zenith angles

of 45° and 75°, respectively.

Mean directional (cosine) response

of seven apogee PAR-FAR 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 PAR-FAR

sensors from the mean of replicate

PAR detectors (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.