Thomson-csf

Lucien Guyot

Pierre Felix

Marc Arques

Bernard Epsztein

Guy Moiroud

Jean Philippe Reboul

Daniel Charles

The disclosure concerns the observations of very fast light phenomena. It is desired to temporarily store a series of images arriving at a fast rate (one every 10 nanoseconds) for a duration (one microsecond) that gives enough time receive an order of selection of an image which is worthwile for analysis. The other images, which had been stored solely in case one of them might be interesting, are eliminated as and when they are not selected. An electron tube is used for the conversion of light images into packets of electrons. Each packet represents an image. The packets move in the tube from one end to the other, behind one another. The method and device disclosed make use of the property that these packets of electrons have, of moving far more slowly than light if the electrical fields in the tube are weak. It is therefore possible to temporarily store a large number of images in the form of these packets of electrons travelling in the tube for a duration which may be one microsecond. At the end of the trip, a selection grid enables a desired image to be selected and sent to the output face of the tube.

Electron tube for the detection, memorizing and selection of light images

Disclosed is an imaging device of the type which, notably, associates a scintillator screen and a matrix of photosensitive elements. The invention particularly concerns means which can be used to reduce an active surface of a photosensitive element to a far greater extent than the quantity of light to which this photosensitive element is exposed. To this end, the scintillator has an input screen and an output screen, respectively applied to an input face and an output face of the scintillator, the output screen being provided with apertures that let through a light emitted by the scintillator, the apertures being placed in a matrix arrangement and indexed on the network of photosensitive elements.

Imaging device with matrix structure

The disclosure concerns the reading of the photocharges generated by the illumination of a matrix of photosensitive dots. The dots are formed by a photosensitive diode in series with a reading diode, all between a row and a column of the matrix. To reduce the reading errors, there is provision to illuminate the photosensitive dots with a constant illumination which gets added to the illumination to be measured, thus creating driving charges that get added to the useful charge and facilitate its transfer to a reading register.

Method for the reading of photosensitive cells of the type comprising

A picture tube designed for providing an electrical output includes a vacuum enclosure provided with a window transparent to the radiation to be converted to an electrical signal and a window transparent to a scanning light beam. The enclosure houses an assembly including a screen and a photocathode having a mosaic of picture storage elements, and an electron-emissive cathode for establishing a reference potential on the photocathode, an anode for collecting signal electrons, a field grid and electron optics. An external light source is used to provide a light beam for scanning the photocathode.

Picture tube with video output, picture taking system utilizing such

A device for producing televised pictures with a high degree of resolution comprises a photosensitive matrix which receives an optical image, and an electromechanical apparatus for displacing the matrix with respect to the optical image formed thereon. The displacement is equal to half the size of an elementary modual, or pixil, defined by the intersection of the lines and columns of the matrix.

Device for producing televised pictures with a charge transfer matrix

This device comprises several charge-transfer shift registers integrated on the same semiconductor substrate and disposed one above the other along the axis Oy. The charge-transfer electrodes are common to all the registers and each package of charges injected under an electrode having received the impact of particles is transferred along axis Ox to underneath a diffused zone common to all the registers what causes currents to flow in two electrodes connected to the ends of the zone diffused along axis Ox.

Particle-impact localizing device, a cathode-ray oscilloscope and a

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

A device for furnishing an electrical video signal representing the analysis of an image given in the form of radiated energy. It comprises a mobile carrier, a gas or photo-conductor interacting with the incident radiation in order to furnish a non-uniform distribution of electrical charges upon the carrier, and read out means for reading said charge distribution, delivering an electrical video signal representing a line-by-line analysis of the incident image.

Device for the electrical analysis of an image

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 device for the non-destructive electrical read-out of a light image, using an electronic tube which comprises in particular a target for recording and read-out of the image and an electrongun for scanning the image. The read-out device is constituted by the tube and means which divide by a factor of n the electron beam current, thus preventing the destruction of the light information during n successive read-out operations.

Non-destructive read-out device

A target for ultrasonic camera comprising, applied to a substrate, a pyroelectric retina covered, in the present example, with a layer which absorbs incident ultrasonic waves; the temperature rise due to said absorption produces in the retina a charge relief read out by means which depend upon the selected device, for example an electron beam as in the case of the known pyroelectric targets.

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Paris, France

Lucien Guyot