Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1989-04-25
1991-04-30
Wallace, Linda J.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
7386106, 356351, 356354, G01P 336, G01B 902
Patent
active
050112783
ABSTRACT:
Young's fringes are produced from a double exposure image of particles in a flowing fluid by passing laser light through the film and projecting the light onto a screen. A video camera receives the image from the screen and controls a spatial light modulator. The spatial modulator has a two dimensional array of cells the transmissiveness of which are controlled in relation to the brightness of the corresponding pixel of the video camera image of the screen. A collimated beam of laser light is passed through the spatial light modulator to produce a diffraction pattern which is focused onto another video camera, with the output of the camera being digitized and provided to a microcomputer. The diffraction pattern formed when the laser light is passed through the spatial light modulator and is focused to a point corresponds to the two dimensional Fourier transform of the Young's fringe pattern projected onto the screen. The data obtained fro
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Wallace Linda J.
Wisconsin Alumni Research Foundation
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