Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1977-02-11
1979-04-10
Buczinski, S. C.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
G01P 336
Patent
active
041485858
ABSTRACT:
A laser Doppler velocimeter which can measure fluid flow in three dimensions, employing a laser beam projected through a rotating diffraction grating and spaced lenses, with a beam splitter in the major optical path between two lenses ahead of the flow channel through which the fluid passes. Selected pairs of laser-derived beams are directed through the fluid and intersect at a predetermined point in the fluid. The movement of the particles through interference patterns formed by the intersecting laser-derived beams generates further-modulated scattered light, which is focused on a photomultiplier tube, from the output of which a fluid velocity directional component signal is derived for each pair. There are four laser-divided beams, and different pairs of these beams can be selected, to provide measurements from which the components of the fluid velocity along three mutually orthogonal directions can be derived.
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Bargeron C. Brent
Deters Owen J.
Buczinski S. C.
The United States of America as represented by the Department of
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