%0 Journal Article
%A Bará, Salvador
%A Tapia Ayuga, Carlos 
%A Zamorano Calvo, Jaime
%T Absolute radiometric calibration of TESS-W and SQM night sky brightness sensors
%D 2019
%@ 1424-8220
%U https://hdl.handle.net/20.500.14352/13359
%X 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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