Cosine response characteristics of some radiometric and photometric sensors

摘要: Abstract Global and diffuse irradiance illuminance are measured with instruments that assumed to have true cosine responses. From one refereed paper, some institutional reports, by word-of-mouth, it is generally known no instrument perfect in this regard. This paper reports on measurements of responses for several commercial the response a multi-filter rotating shadowband radiometer. The were made an automated test bench using same protocol each instrument. measures variable angular resolution as fine 0.25°. rotation plane. A manual allows at other azimuths.