Patent ID: 8749794
Filing Date: 2014-06-10
Classification: G01P,G01S,Y02A

Abstract:
1. An optical device for an aircraft designed to measure temperature associated with molecular movement in a gas, said gas occupying a determined measurement zone, the optical device comprising: an optical emission module, an optical reception module, optical means forming a reference path and computing means connected to the optical reception module, the optical emission module comprising a first optical system emitting a first light beam at a first wavelength in the determined measurement zone, said first optical system having a first optical axis, the optical reception module comprising a second optical system and at least a first photoreceptor, said second optical system having: a second optical axis, comprising at least optical mixing means for mixing a portion of the first light beam originating from the reference path and a second light beam corresponding to a portion of the light of the first light beam scattered by the determined measurement zone, said second light beam being emitted at least a second wavelength, forming an image of the first and second mixed light beams on said first photoreceptor, wherein the computing means is arranged to determine at least a difference in wavelength or in frequency between the first wavelength and the second wavelength, the difference in the wavelength or in the frequency being representative of molecular scattering, said molecular scattering being Brillouin-Mandel'shtam scattering, and said difference being linked to a thermal activation of the molecules of the gas, and wherein an angle that the first optical axis and the second optical axis make between them is different from zero.