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- W3025730160 abstract "We are developping a 40 mm photocathode photon counting camera for astronomical use, mainly stellar interferometry and multislit spectroscopy. Light intensification is performed by a stack of two image intensifiers; the first, a 1st generation one, provides the resolution, the quantum efficiency and the peak shaped pulse amplitude distribution. It is followed by a microchannel one which provides most of the gain. Readout of the intensified image is achieved by 4 CCD cameras (288 x 384 pixels each). They are coupled to the intensifier stack with a fiber optic reducer and 4 fiber optic cylinders to split the image in 4 quadrants. The video signals of the CCDs are digitized and 4 wired processors compute on line the photocenter of each event with an accuracy of 1/4 CCD pixel. This provides a total image sampling of 3072 x 2304 pixels, their size beeing 13 x 13 μm in the input photocathode plane. Coordinates of the centers of the events are sent to a VME bus based microcomputer that performs preproing and storage of the information." @default.
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- W3025730160 date "1986-01-01" @default.
- W3025730160 modified "2023-09-24" @default.
- W3025730160 title "A 40 mm photon counting camera." @default.
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