出典:Wiktionary
出典:『Wiktionary』 (2017/01/19 23:02 UTC 版)
sun + photometer
sunphotometer (複数形 sunphotometers)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/11 19:12 UTC 版)
A sun photometer is a type of photometer conceived in such a way that it points at the Sun. Recent sun photometers are automated instruments incorporating a Sun-tracking unit, an appropriate optical system, a spectrally filtering device, a photodetector, and a data acquisition system. The measured quantity is called direct-Sun radiance.