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US 7,925,052 B2Granted
Passive method for wind measurement
AssigneeSoreq Nuclear Research Center
InventorJonathan Bar-Sagi
Life of this patent
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Abstract
A method for measuring wind velocity including using a Fourier Transform (FT) and a correlation between a wave vector number and temporal frequency of a wind to calculate wind velocity. Contour line deviations in a series of images of a far object are evaluated by performing a spatial discrete fourier transform (DFT) on deviations within each image, and subsequently a time discrete fourier transform (DFT) on the Fourier coefficients obtained by the spatial DFT, to get the frequency dependence of each Fourier coefficient.
Claims3
A method for measuring wind velocity comprising:
- taking a picture of a far object through a turbulent atmosphere, wherein a position of said object in the picture changes due to light rays being shifted by a turbulence eddy, said eddy being dragged along a horizontal line, wherein a perturbation to the picture that moves along the horizontal line has a speed proportional to the wind velocity component perpendicular to the line and exists for a time period inversely proportional to that wind velocity component, wherein the eddy projects a disturbance on the recording imaging system of size proportional to its own size;
- obtaining significant Fourier elements in accordance with the size of the disturbance;
- and
- obtaining the frequency dependence of each k Fourier coefficient and calculating therefrom wind velocity.
1 more element
Dependencies are inferred from the claim text.