Thomson-csf

Pierre Felix

Lucien Guyot

Guy Le Parquier

Guy Moiroud

Serge Veron

Philippe Gamot

The invention relates to a shooting target. The signal plate covering one of the faces of the actual target is subdivided into a plurality of electrically independent elementary signal plates in order to reduce the stray capacitance during the sampling of the signal on said plate. According to a preferred arrangement, these elementary plates are oriented in the same way as the scanning lines by the reading electron beam. This reading is performed either by a single beam or by a certain number of independent beams each covering a portion of the target. The applications are the same as in the prior art and in particular to infrared photography.

Target for picture tube, tube provided with such a target and picture

Electrical signals delivered by detectors at the surface of a first high-capacitance insulating layer which provides a separation between a first array of metallic electrodes and the detectors are collected by the electrodes by capacitive coupling. The first array of electrodes is electrically connected to a second array of electrodes having smaller dimensions. The two arrays are separated by a second insulating layer and the second array is located at the interface between the second insulating layer and the oxide layer which covers the semiconductor readout substrate.

Mosaic of radiation detectors read by a semiconductor device and a

Device for reading a picture pickup target and assembly constituted by the target and such a reading device. The target I takes the form of a matrix of detectors placed at the points of intersection of lines and rectangular columns. The reading device II comprises one input per line and for each line: (1) a channel A connected to said input wherein the signals of the points of the line are transferred in series and at the same time for all the columns in the line reading time t.sub.1 ; (2) a storage channel B into which the signals of channel A are transferred in parallel and stored; (3) an evacuation channel C into which the signals from channel B are transferred in parallel and from which they are transferred to a reading register with a single input, to an amplifier therefrom and to the reading apparatus. Storage in B enables the signals to be processed, in particular integrated throughout the time comprised between t.sub.1 and the register evacuation time.

Picture pickup target and reading device assembly

An apparatus, and a process, for reading a target of a camera tube. The apparatus includes circuits for scanning the inner surface of the target along a plurality of parallel lines. The scanning being done by an electron beam. Means for stabilizing each line of order n by a stabilizing scan of the electron beam to a value V.sub.o. And means for reading the line of order n by a reading scan of an electron beam to a value V'.sub.o, after an integration time ti that is adjustable; and V'.sub.o being lower than V.sub.o is absolute value.

Apparatus and a process for reading a target of a camera tube

Process and arrangement for reconstituting the signal representing the thermal flux absorbed by a pyroelectric target, the arrangement being used in infrared camera tubes. It comprises means for correcting the signal Sn for reading a point of co-ordinates x, y of the target, during a frame of order n, comprising means for calculating a first component representing the Laplacian of the signal Sn and means for summating the signal Sn with the first component. The correcting means deliver a corrected signal. Means for generating a complementary signal are connected to the output of the calculating means and comprise means for generating a signal representing the temperature .theta..sub.n-1 of the point of co-ordinates x, y during the reading of that point in the course of a frame of order n-1 and a second component representing the Laplacian of that temperature. Means for summating the complementary signal with the corrected signal deliver the reconstituted signal.

Process and arrangement for reconstituting the thermal flux absorbed by

A camera system, in particular for the detection of infrared radiation, wherein the detector uses the pyroelectric effect. It permits the viewing of fixed object owing to a time modulation of the radiation coming from such objects. This modulation is achieved by means of a partly transparent grid which moves between the object and the radiation detector.

Camera system employing pyroelectric effect

A method for electrically reading a target such as a pyroelectric one, in a camera tube. It consists in the repetition of a sequence of three phases: reading by an electron beam scanning process, compensation by secondary electron emission and levelling of the potential of the target, the duration of each of the phases being substantially equal to the duration of an analysis line of the target. The last two phases are provided for lines preceding the line read respectively by numbers p and k of lines with p&lt;k.

Method for electrically reading a resistive target in a camera tube

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.

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Paris, France

Pierre Felix