Apogee MQ-501 Benutzerhandbuch - Seite 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 SQ series quantum sensors is

approximately ± 2 % and ± 5 % at solar zenith angles of 45°

and 75°, respectively.

Mean cosine response of seven

apogee SQ-500 quantum sensors.

Cosine response measurements

were made on the rooftop of the

Apogee building in Logan, UT. Cosine

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).