Method of, and apparatus for measuring the flow velocity in wind

Details Method of, and apparatus for measuring the flow velocity in wind Method of, and apparatus for measuring the flow velocity in wind

1988-09-01

1990-05-15

Tarcza, Thomas H.

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

7386105, 356338, 364822, G01P 336, G01P 518

Patent

active

049252968

ABSTRACT:
A method of measuring the flow velocity in wind tunnels is indicated, in which a path covered by particles located in a flow is employed as a measure of the flow velocity. In a pre-determined time interval, the particles are illuminated twice in a plane by means of a light, and a light reflected by the particles is recorded and transmitted in the form of an image. The image is transilluminated by a second coherent light beam focused in a first Fourier plane, and in this way a first Fourier-transformed image is produced, which is recorded in its turn. The image and the first Fourier-transformed image (23) are displayed immediately. The first Fourier-transformed image (23) is transilluminated by a third coherent light beam (19), and consequently a second Fourier-transformed image (34) is produced in a second Fourier plane (33) in an optical manner. The second Fourier-transformed image (34) is recorded and immediately further processed.

REFERENCES:
patent: 4162509 (1979-07-01), Robertson
patent: 4272189 (1981-06-01), Bailey et al.
patent: 4396943 (1983-08-01), Lord et al.
patent: 4518256 (1985-05-01), Schwartz
patent: 4695973 (1987-09-01), Yu
patent: 4733962 (1988-03-01), Brendemuehl

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