Abstract
We present a third generation Image Photon Counting System (IPCS) based on an GaAs photo cathode that can achieve quantum efficiency up to 28%, comparable to a thick CCD, but without readout noise. This system is 10 times more sensitive at Hα wavelength than previous photon counting cameras. In terms of S/N ratio, the system outperforms the CCD for extremely faint fluxes, including anti-reflective coated low noise thin CCDs.
This system offers up to 1K×1K pixel, which is the largest monolithic IPCS. An original cooling system based on a Ranque-Hilsh vortex tube is used on this camera. The real-time centering is done by a scalable DSP board. Preliminary results obtained with this new camera coupled with a scanning Fabry-Perot at the Cassegrain focus of the 3.6-m ESO telescope, the 1.93-m Observatoire de Haute Provence (OHP) telescope, and 1.6-m mont Mégantic OmM (Québec) telescope are presented.
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Gach, JL., Hernandez, O., Boulesteix, J., Carignan, C. (2004). Fabry Perot Observations Using a New GaAs Photon Counting System. In: Amico, P., Beletic, J.W., Beletic, J.E. (eds) Scientific Detectors for Astronomy. Astrophysics and Space Science Library, vol 300. Springer, Dordrecht. https://doi.org/10.1007/1-4020-2527-0_40
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DOI: https://doi.org/10.1007/1-4020-2527-0_40
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