Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-06-25
1991-09-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356 285, 356342, 356345, 250235, G01P 336, G01B 902
Patent
active
050476530
ABSTRACT:
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.
REFERENCES:
patent: 3895872 (1975-07-01), Dandliker et al.
patent: 4195931 (1980-04-01), Hara
patent: 4263002 (1981-04-01), Sathyakumar
patent: 4334779 (1982-06-01), Domey et al.
patent: 4483614 (1984-11-01), Rogers
patent: 4974960 (1990-12-01), Dopheide et al.
Beigbeder Gerard
Garcia James
"Thomson-CSF"
Messinger Michael
Nelms David C.
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