Apogee Instruments SU-221 Manuale d'uso - Pagina 8

Sfoglia online o scarica il pdf Manuale d'uso per Accessories Apogee Instruments SU-221. Apogee Instruments SU-221 20. Ultraviolet-a sensor

Cosine Response

Cosine Response Graph

Directional, or cosine, response is

defined as the measurement error at

a specific angle of radiation incidence.

Directional error for Apogee SU-200

series UV-A sensors is approximately ±

2 % and ± 5 % at solar zenith angles of

45° and 75°, respectively.

Mean cosine response of four

Apogee UV-A sensors. Cosine

response was calculated as the

relative difference of UV-A

sensors from the mean of

replicate reference UV-A sensors

deployed outdoors. These data

are the average of the AM and

PM response.