Thomson-csf

Serge Veron

Guy Moiroud

Pierre Felix

Claude Y Raverdy

Philippe Gamot

In order to facilitate the preparation of the reticular pyroelectric target and to improve the mechanical strength thereof, it is provided to connect together the elements of the mosaic, separated by gaps, by means of junction arms small in section with respect to said elements, and rising up to a certain height from the base thereof. These ramifications protect the electric connection between elements provided by the underlying conducting layer, during elaboration thereof; they reinforce the rigidity of the assembly.

Pyroelectric target and image pick up tube provided with such a target

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.

Method and a device for analyzing a pyroelectric target

In camera using resistive targets wherein a recording tube of which the target (100) made of a pyroelectric material in the example and read by a beam of electrons, permanently receives a flow of ions formed in the tube by the collision between the electrons of the beam and the atoms of a gaseous mass of which the pressure in the tube is determined by the temperature of a reservoir, the invention provides means for controlling the temperature of the reservoir (filament 03) in dependence upon the average target current which is proportional to the flow of ions in question.

Camera device with resistive target

A pyroelectric radiation detector which is relatively immune to the effects of microphonic vibrations includes within an evacuated envelope a triglycine sulphate (TGS) target secured by silicone grease to a thin (3-6 .mu.M) mica support plate. The mica support plate is adhesively secured by means of an enamel to a titanium annulus which, in turn, is epoxied to the window of the evacuated envelope. The coefficients of expansion of the annulus and the support plate are selected such that after they are joined on to the other the support plate is stretched tightly across the annulus and therefore has a natural period substantially higher than the natural period of the annulus which supports it.

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Paris, France

Serge Veron