Method and apparatus for detecting wind velocities by means...

Optics: measuring and testing – Velocity or velocity/height measuring – With light detector

Reexamination Certificate

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Reexamination Certificate

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07463341

ABSTRACT:
In the case of a method of detecting wind velocities by means of a Doppler-lidar system (10), a laser beam of a defined frequency generated by means of a laser (11) is emitted by a transmitting device (12) toward a space area and the light backscattered from the space area is received by means of a receiving telescope (13). For determining a Doppler shift, an interferogram is generated by means of an interferometer (16), the intensity distribution of the interferogram being directly measured by means of a photodetector (17). The measured intensity distribution is compared with one or more reference patterns which had previously been determined for defined parameters and are filed in a memory device (18a). From the comparison, the Doppler shift is determined as a measurement for the wind velocity. The Doppler-lidar system (10) comprises an analyzing unit (18a, 18b) for implementing the method, having a comparison unit (18b) for the comparison of reference patterns with the measured interferogram.

REFERENCES:
patent: 4195931 (1980-04-01), Hara
patent: 5088815 (1992-02-01), Garnier et al.
patent: 5214484 (1993-05-01), De Mollerat du Jeu
patent: 5216477 (1993-06-01), Korb
patent: 6313908 (2001-11-01), McGill et al.
patent: 6894768 (2005-05-01), Caldwell et al.
patent: 40 13 702 (1991-10-01), None

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