3) Software
16-bit A/D converter with correlated double sampling
provides a high dynamic range and noise level as the CCD chip
itself. Fast USB interface allows to download image in a few
seconds. Maximal length of the USB cable is 5 m. Some active
USB extension elements enable a communication up to 100 m
distance.
4) Measurement equipment using
The camera with Peltier cells cooled chip can capture low
luminance (up to 0,0001 cd/m2). The images taken by CCD
camera are evaluated by using LUMIDISP software.
The CCD camera for long-term luminance measurement of
the night sky will be installed together with the existing
measuring devices at the new library building roof at VŠB-TU
Ostrava.
D. Measuring instrument SQM-LE
SQM (Sky Quality Meter) is a device for measuring the
brightness of the night sky in the visible spectrum in
astronomical units. Measurements display the results in
mag/arcsec2 units. The results can be converted to the
luminance (cd/m2) according to the following formula: