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In the period of September 2023 until December 2025, the instrument was installed on the Hafelekar Fernmeldeamt station at an altitude of 2275m amsl. Two solar panels and an inverter battery system allowed for self-sufficient energy generation from early March until middle of November. A 5G WiFi router was installed together with an external antenna on top of the instrument (as it can be seen in figure C1), enabling a fast data downlink during operation.
In its final configuration, the instrument was installed with the slit oriented horizontally. With this setup, the tracker was moving from up to down, scanning the scene of Innsbruck in 289 discrete steps over a range of 20° in case of the wide field of view lens, or in 145 discrete steps covering 1° of the scene in case of the narrow field of view lens. The raw L0 data was stored on the instrument's PC and uploaded to the Cloud afterwards. L0 to L3 data processing takes place on the LuftBlick server subsequently.
The two lens configurations provide two field of views as shown in figure C2. During the validation phase in summer 2024, the instrument was measuring with the wide field of view lens ("WFOV"). It was changed to the narrow field of view lens ("NFOV") in autumn 2024. During the spring and summer 2025, it was changed back to the WFOV, and in the last weeks of operation in autumn 2025, it measured again with the NFOV setup. In December 2025, the instrument was dismounted.
Figure C1: The instrument installed on the Hafelekar site, with the city of Innsbruck in the background.
Figure C2: Schematic of the available two lens options: The blue area shows the field of view of the 65° lens, and the orange area shows the field of view of the 6° lens.
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