초록 ▼

A device uses fringe laser diode anemometers which, from the beams coming from one or more laser diodes, form measuring volumes having interference fringes. The component of the relative speed of an aircraft in a direction perpendicular to the plane of these fringes is deduced from the modulation of

A device uses fringe laser diode anemometers which, from the beams coming from one or more laser diodes, form measuring volumes having interference fringes. The component of the relative speed of an aircraft in a direction perpendicular to the plane of these fringes is deduced from the modulation of light reflected by particles moving through the measuring volume to cause modulation of the signal of the photodetector of each anemometer during their passage in the measuring volume of this anemometer. By joining two anemometers with the measuring volumes whose planes of the associated fringes are, for example, orthogonal, it is possible to determine two components of the relative speed vector and determine, for example, this relative speed in the longitudinal vertical plane of the aircraft, and to deduce from it the angle of incidence of the aircraft.

대표청구항 ▼

A device for obtaining signals representative of a relative speed of a vehicle with respect to an ambient fluid comprising: at least one fringe anemometer, positioned on board the vehicle, and having: a radiant energy emitting source for emitting a radiant energy beam, measuring volume forming means

A device for obtaining signals representative of a relative speed of a vehicle with respect to an ambient fluid comprising: at least one fringe anemometer, positioned on board the vehicle, and having: a radiant energy emitting source for emitting a radiant energy beam, measuring volume forming means for forming the radiant energy beam into a measuring volume having at least an interference fringe and a measuring axis, a photodetector for receiving light reflected from the measuring volume and for generating output signals representative thereof, and an optical filter having a bandpass substantially at an emission frequency of the radiant energy beam of the radiant energy emitting source, the optical filter being position along an optical path extending between the measuring volume and the photodetector; and orienting means for orienting the measuring axis of the measuring volume of the at least one laser anemometer in at least two different directions so that the photodetector generates signals representative of light reflected from the measuring volume for the at least two different directions.