Journal
SENSORS
Volume 19, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/s19061336
Keywords
night sky brightness; radiance; astronomical magnitudes; light pollution
Funding
- Xunta de Galicia/FEDER [ED431B 2017/64]
- Spanish MICINN [AYA2016-75808-R]
- Madrid Regional Government through the TEC2SPACE-CM Project [P2018/NMT-4291]
- STARS4ALL
- European Union [H2020-ICT-2015-688135]
- [AYA2015-71542-REDT]
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We develop a general optical model and describe the absolute radiometric calibration of the readings provided by two widely-used night sky brightness sensors based on irradiance-to-frequency conversion. The calibration involves the precise determination of the overall spectral sensitivity of the devices and also the constant G relating the output frequency of the light-to-frequency converter chip to the actual band-weighted and field-of-view averaged spectral radiance incident on the detector (brightness). From these parameters, we show how to define a rigorous astronomical absolute photometric system in which the sensor measurements can be reported in units of magnitudes per square arcsecond with precise physical meaning.
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