| 摘要 |
The device uses fringe laser diode anemometers which, from the beams coming from one or more laser diodes, for measuring volumes made of 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 that the dust particles cause in 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 fringes are, for example, orthogonal, it therefore is possible to determine two components of the relative speed vector and therefore to 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.
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