Method and a device for analyzing a pyroelectric target

Abstract

A method and a device for analyzing a pyroelectric target in an evacuated envelope. The target with two opposite faces has a first face disposed towards a zone of the envelope which is transparent to an incident radiation. The second face is orientated towards an electron gun generating device which operates at least one electron beam. A first scanning of the pyroelectric target with a high intensity low resolution electron beam allows a stage of neutralization of the electron charges induced in the target by the incident radiation. The stage of neutralization is to be considered as effecting a storage of the signal recorded on the target. A second scanning of the pyroelectric target with an electron beam of high resolution and low intensity corresponds to a stage of read-out proper of the target. The device is provided, on the one hand, with circuits for the control of the intensity of emission of the electron beam and, on the other hand, with circuits for the control of the voltage applied to the pyroelectric target, positive boosts of potentials being applied to the target during the stage of neutralization and read out proper. A common control circuit controlled by a synchronization signal representing the emission recurrences signals of the incident radiation controls the circuits for the control of the intensity of emission of the electron beam and the circuit for the control of the voltage applied to the target.

Dependencies are inferred from the claim text.