osiris snr calculato OSIRIS is a versatile instrument and provides many observing modes, some of which are new or at least non standard. The OSIRIS SNR Calculator is a tool that covers the main observing modes of the inst
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osiris snr calculato Description

OSIRIS is a versatile instrument and provides many observing modes, some of which are new or at least non standard. The OSIRIS SNR Calculator is a tool that covers the main observing modes of the instrument. These are: broad-band imaging, spectroscopy and tunable filter (TF) imaging. This tool estimates signal-to-noise ratios for a given exposure time. The approach to do that is to compute the expected signal at the detector by taking into account all the elements involved in the detection process (telescope, lenses, filters, detectors, etc.) as well as the external factors contributing mainly to photon losses or noise (atmosphere, sky brightness, Moon brightness). Many of the factors are well known or may be measured accurately, for instance the instrument efficiencies, while others must be estimated or assumed (e.g. sky brightness).

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