Fotometro monocanale |
The single channel photometer is placed at the Cassegrain focus. It employs a EMI 9893QA/350, spectral response S20 photomultiplier, which cooled to -15 oC has a dark courrent of 1 count/sec. The photomultiplier of high speed type allows time resolutions up to 1 ms. The acquisition system, operating in photon-counting mode is based on a Personal Computer, which receive the photomultiplier signal and drive the filter wheel. Up to 8 filters can be selected for contemporaneous observations. On-line plot of counts as function of time is allowed by the software Obelix written by the photometry group of Catania Observatory.
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Ultimo aggiornamento Sabato 08 Gennaio 2011 21:59 |