DATA
Photometer Network
The Photometer Network activity of the DARKERSKY4CE project consisted not only in the systematic organisation and harmonisation of sky brightness and light pollution measurements carried out in the region of Central Europe, but also in the deployment of new photometers.
The DARKERSKY4CE Photometer Network is dedicated to improving the density and quality of sky brightness measurements and to quantifying light pollution in non-urban areas, with particular attention to the areas of the project Pilot Demo Sites.
To this purpose, the DARKERSKY4CE partnership selected the SQM (Sky Quality Meter) device developed by Unihedron. This is an affordable instrument, widely used among researchers and astronomers, to measure night sky brightness in units of magnitudes per square arcsecond. Indeed, SQMs measure the visible light in the wavelength range from 300 to 700 nm, integrating incoming light in a field of view of about 20°.
The Unihedron SQM-LE (Ethernet-enabled) unit allows for an easy installation in a fixed position. In this configuration, the SQM device is typically installed on the roof of a building by means of a dedicated support, enclosed in a waterproof housing, and connected via an Ethernet cable running to a mini-PC, which instead is installed in an indoor room to be kept safe from the elements. The DARKERSKY4CE SQMs are operated via a version of the open-source software named PySQM that was adapted to the needs of the project itself.
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