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Sensors 2019, 19(6), 1336;

Absolute Radiometric Calibration of TESS-W and SQM Night Sky Brightness Sensors

Departmento Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
Departamento Física de la Tierra y Astrofísica. Instituto de Física de Partículas y del COSMOS (IPARCOS), Universidad Complutense, 28040 Madrid, Spain
Author to whom correspondence should be addressed.
Received: 18 January 2019 / Revised: 11 March 2019 / Accepted: 11 March 2019 / Published: 17 March 2019
(This article belongs to the Section Physical Sensors)
PDF [1078 KB, uploaded 17 March 2019]


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. View Full-Text
Keywords: night sky brightness; radiance; astronomical magnitudes; light pollution night sky brightness; radiance; astronomical magnitudes; light pollution

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Bará, S.; Tapia, C.E.; Zamorano, J. Absolute Radiometric Calibration of TESS-W and SQM Night Sky Brightness Sensors. Sensors 2019, 19, 1336.

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