Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-08
Astropart.Phys.27:509-511,2007
Astronomy and Astrophysics
Astrophysics
This method was first presented as a poster at the Cherenkov 2005 meeting "Towards a Network of Atmospheric Cherenkov Detector
Scientific paper
10.1016/j.astropartphys.2007.02.
We have developed a method to measure the mirror reflectivity of telescopes. While it is relatively easy to measure the local reflectivity of the mirror material, it is not so straightforward to measure the amount of light that it focuses in a spot of a given diameter. Our method is based on the use of a CCD camera that is fixed on the mirror dish structure and observes simultaneously part of the telescope's focal plane and the sky region around its optical axis. A white diffuse reflecting disk of known reflectivity is fixed in the telescopes focal plane. During a typical reflectivity measurement the telescope is directed to a selected star. The CCD camera can see two images of the selected star, one directly and another one as a spot focused by the mirror on the white disk. The ratio of the reflected starlight integrated by the CCD from the white disk to the directly measured one provides a precise result of the product of (mirror area x mirror reflectivity).
Garczarczyk Markus
Hose J.
Mirzoyan Rafayel
Paneque David
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