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Abstract

A photon detecting device including a sensor including a vacuum chamber, a photocathode arranged therein to convert photons to primary electrons, a converter converting at least part of the energy of accelerated primary electrons to secondary charges collected by a plurality of detection cells, an acquisition circuit adapted to read the charges collected by the detection cells with an integration time allowing an impact density to be obtained per unit of time and per unit surface of a cell of the order of a single electron, a system identifying a cluster of adjacent detection cells of which at least one so-called main cell includes a quantity of collected charges higher than a threshold value, a system determining at least one characteristic of the cluster, a system memorizing at least one characteristic of a reference cluster resulting from conversion of a primary electron, and a system comparing the determined characteristic(s) of the cluster with the memorized characteristic(s) of the reference cluster to evidence whether the cluster results from the conversion of a primary electron.

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First Claim