Apogee Instruments SP-215 소유자 매뉴얼 - 페이지 9

{카테고리_이름} Apogee Instruments SP-215에 대한 소유자 매뉴얼을 온라인으로 검색하거나 PDF를 다운로드하세요. Apogee Instruments SP-215 20 페이지. Pyranometer

Cosine Response

Directional, or cosine, response is

defined as the measurement error at

a specific angle of radiation incidence.

Error for Apogee silicon-cell

pyranometers is approximately ± 2 %

and ± 5 % at solar zenith angles of 45°

and 75°, respectively.

Mean cosine response of eleven Apogee

silicon-cell pyranometers (error bars

represent two standard deviations

above and below mean). Cosine

response measurements were made

during broadband outdoor radiometer

calibrations (BORCAL) performed during

two different years at the National

Renewable Energy Laboratory (NREL) in

Golden, Colorado. Cosine response was

calculated as the relative difference of

pyranometer sensitivity at each solar

zenith angle to sensitivity at 45° solar

zenith angle. The blue symbols are AM

measurements, the red symbols are PM

measurements.