Axial speed-measuring device including a fabry-perot interferometer
AssigneeSociete Europeenne de Systemes Optiques SESO
InventorChristian de Mollerat du Jeu
Life of this patent
Estimating the term…
Abstract
A device for measuring axial speed by means of a light source emitting a parallel ray beam through an optical system comprising a Fabry-Perot interferometer, spectrum offset optical means, and an interference filter, the optical system being used for receiving backscattered light flux, and the device further comprising at least one photodetector on which the light flux leaving the optical system is focused, the device serving, in particular, to measure axial wind speed at distances lying between about 10 meters and about 100 meters.
Claims14
An axial speed-measuring device comprising a light source associated with collimating optics for emitting a beam of parallel rays in a given direction, at least one photodetector associated with focusing optics to receive backscattered light flux and to deliver a signal corresponding to the intensity of the received light flux, and the same optical system used both for emitting the above-specified beam and for receiving the backscattered light flux, said optical system comprising a Fabry-Perot interferometer transforming the spectrum of the emitted beam into a line spectrum, and spectrum offset optical means for providing a spectrum offset between the emitted light beam and the backscattered light flux.
Dependencies are inferred from the claim text.