Abstract:
Apparatus for the multiple drawing of fibers allowing the simultaneous drawing out of a plurality of optical fibers then the multifibre cabling on line. The apparatus comprises a first drawing assembly formed by a support (2) of N preforms, an oven (4) with N containers, a coating system (8), N capstans for the drawing (12) and a second cabling assembly comprising an extruder and assembling devices. Application to the manufacturing of optical fibers.
Abstract:
Apparatus for recording and retrieving graphical information comprising at least one laser and means for directing onto a light sensitive carrier two collimated beams of laser radiation are employed and superimposed images are recorded. The azimuth angle between the first and second beams is adjusted.
Abstract:
System for recording graphical data in the form of holograms on a plurality of hologram carriers, each hologram carrier storing a group of holograms, and for reading selected ones of these graphical data. The recording means includes an object carrier for holding transparent objects, a coherent light spurce giving rise to an object beam passing through an object and a recording reference beam describing a cone around the axis of the object beam and able to take discrete azimuthal angular positions on the cone. The reading means includes a coherent light source giving rise to a reading reference beam describing a cone around the normal to the hologram carrier and able to take discrete azimuthal angular positions on the cone. The hologram carriers are arranged in a matricial array and a given hologram has three addresses: the coordinates of the hologram carrier which contains it and an angle which is the position of the reading reference beam on the cone which it describes.