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Sensors (Basel). 2019 Mar 17;19(6). pii: E1336. doi: 10.3390/s19061336.

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

Author information

1
Departmento Física Aplicada, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain. salva.bara@usc.es.
2
Departamento Física de la Tierra y Astrofísica. Instituto de Física de Partículas y del COSMOS (IPARCOS), Universidad Complutense, 28040 Madrid, Spain. ceta@ucm.es.
3
Departamento Física de la Tierra y Astrofísica. Instituto de Física de Partículas y del COSMOS (IPARCOS), Universidad Complutense, 28040 Madrid, Spain. jzamorano@fis.ucm.es.

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.

KEYWORDS:

astronomical magnitudes; light pollution; night sky brightness; radiance

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