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An automated method for the evaluation of the pointing accuracy of Sun-tracking devices

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Figure 1. The instrumental setup is described as follows:ating device;nents: circular aperture (A), filter block (F), achromatic lens (L), andcamera chip (C); (a) oper- (b) optical layout with the following labeled compo- (c) mounting system; (d) radiation platform withKSO-STREAMS mounted on the Sun-tracking device (SOLYS2,Kipp & Zonen) at the Kanzelhöhe Observatory ARAD site.
Figure 3. Illustration of individual steps in KSO-STREAMS image processing to derive a circular fit to solar-limb pixels: (a) grayscale-transformed solar disk image (original KSO-STREAMS picture is shown as background in panel c); (b) solar-limb pixels (pur
Figure 4. Solar disk center positions (black dots) determined by KSO-STREAMS, used for the determination of the mean daily zero-pointcenters on 12 clear-sky days in 2015
Figure 5. Relative daily sunshine duration (yellow) and valid KSO-STREAMS results (black) during the evaluation period from 14 Marchto 27 June 2015.
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