Eads Astrium Sas

Matra Marconi Space France

Airbus Defence and Space Sas

Astrium Sas

Frédéric Safa

Frédérick Pasternak

Laurent Brouard

Alain Clochet

Jean-Christophe Nonnet

Bertrand Corselle

An optical system including a telescope and a principal pointing device for selecting a direction of observation is disclosed. The system furthermore includes at least one secondary pointing device arranged ahead of a part of the entrance of the telescope and oriented fixedly with respect to the principal pointing device. A set of photodetectors records a secondary image formed by the telescope from light rays directed by the secondary pointing device toward the entrance of the telescope The secondary image makes it possible to accurately determine the direction of observation.

Optical system with variable pointing and method implementing such a system

The invention concerns an optical instrument, designed to be used on a satellite, for simultaneously or quasi-simultaneously observing in two opposite angularly separated directions. It comprises at least two telescopes (TA, TB) having angularly spaced apart observation directions, each having a real and accessible exit pupil and respective planar or superimposable image fields, with a width at least five times more than that of the pupil in a specific direction. Optical means provided at the exit pupil are arranged so as to form the image fields in a common overlapping focal plane except in lateral zones whereof the width is substantially equal to that of the exit pupil of the telescopes. In the common focal plane, an assembly of several matrix detectors are arranged and oriented on the superimposition zone of the image fields of the telescopes in the wavefront.

Optical instrument for observation from a satellite, with two telescopes

The device can be used on an aircraft or spacecraft. It comprises a laser for emitting short light pulses, a channel for receiving the backscattered light flux and an optical conical scanner means making it possible to orient a direction common to laser emission and to reception via the channel along successive generatrices of a cone. The scanner has a mirror rotated about a scanning axis for deflecting an optical path common to a receiving detector and to the laser along successive directions distributed at regular angular intervals around the scanning axis and several stationary reflectors distributed at the regular intervals. The reflectors are successively inserted on the common optical path by the rotating mirror. The stationary reflectors correspond to different probing orientations along the cone. The rotating mirror has a size very much less than that of the beam entering and exiting the device.

Light-backscatter measurement device suitable for use on board a craft

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Toulouse, France

Frédéric Safa