Apogee SQ-514 Manuale d'uso - Pagina 8

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Cosine Response

Directional (cosine) response is defined as the measurement

error at a specific angle of radiation incidence. Error for

Apogee SQ-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 SQ-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 SQ-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.