Publication: Absolute radiometric calibration of TESS-W and SQM night sky brightness sensors
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2019-03-17
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MDPI AG
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Abstract
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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© 2019 by the authors. This work was partially supported by Xunta de Galicia/FEDER, grant ED431B 2017/64 (SB), and partly developed within the framework of the Spanish Network for Light Pollution Studies, REECL (AYA2015-71542-REDT). CET and JZ acknowledge funding by the Spanish MICINN AYA2016-75808-R, by the Madrid Regional Government through the TEC2SPACE-CM Project (P2018/NMT-4291), and by STARS4ALL, a project funded by the European Union H2020-ICT-2015-688135.