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Open AccessArticle

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

1
Departmento Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
2
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.
Sensors 2019, 19(6), 1336; https://doi.org/10.3390/s19061336
Received: 18 January 2019 / Revised: 11 March 2019 / Accepted: 11 March 2019 / Published: 17 March 2019
(This article belongs to the Section Physical Sensors)
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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MDPI and ACS Style

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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