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- Q1038481 subject Q7036785.
- Q1038481 subject Q8411328.
- Q1038481 abstract "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 opticalsystem, a spectrally filtering device, a photodetector, and adata acquisition system.The measured quantity is called direct-sun radiance.When a sun-photometer is placed somewhere within the earth's atmosphere, the measuredradiance is not equal to the radiance emitted by the sun (i.e. the solar extraterrestrial radiance),because the solar flux is reduced by atmospheric absorptionand scattering.Therefore, the measured radiant flux is due to a combination of what is emitted by the sun and theeffect of the atmosphere; the link between these quantities is given by Beer's law.The atmospheric effect can be removed with Langley extrapolation; this method therefore allowsmeasuring the solar extraterrestrial radiance with ground-based measurements.Once the extraterrestrial radiance is known, one can use the sun photometer for studying theatmosphere, and in particular for determining the atmospheric optical depth.Also, if the signal at two or more suitably selected spectral intervalsis measured, one can use the information derived for calculating the vertically integrated concentrationof selected atmospheric gases, such as water vapour, ozone, etc.".
- Q1038481 thumbnail Päikese_fotomeeter_CIMEL_318A.jpg?width=300.
- Q1038481 wikiPageWikiLink Q1172399.
- Q1038481 wikiPageWikiLink Q133139.
- Q1038481 wikiPageWikiLink Q1411145.
- Q1038481 wikiPageWikiLink Q15063273.
- Q1038481 wikiPageWikiLink Q190120.
- Q1038481 wikiPageWikiLink Q210028.
- Q1038481 wikiPageWikiLink Q210765.
- Q1038481 wikiPageWikiLink Q217351.
- Q1038481 wikiPageWikiLink Q291476.
- Q1038481 wikiPageWikiLink Q3230.
- Q1038481 wikiPageWikiLink Q36933.
- Q1038481 wikiPageWikiLink Q445362.
- Q1038481 wikiPageWikiLink Q525.
- Q1038481 wikiPageWikiLink Q690868.
- Q1038481 wikiPageWikiLink Q7036785.
- Q1038481 wikiPageWikiLink Q8104.
- Q1038481 wikiPageWikiLink Q8411328.
- Q1038481 wikiPageWikiLink Q890809.
- Q1038481 wikiPageWikiLink Q897136.
- Q1038481 comment "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 opticalsystem, a spectrally filtering device, a photodetector, and adata acquisition system.The measured quantity is called direct-sun radiance.When a sun-photometer is placed somewhere within the earth's atmosphere, the measuredradiance is not equal to the radiance emitted by the sun (i.e.".
- Q1038481 label "Sun photometer".
- Q1038481 depiction Päikese_fotomeeter_CIMEL_318A.jpg.