The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 10, 1979
Filed:
Feb. 11, 1977
C Brent Bargeron, Columbia, MD (US);
Owen J Deters, Silver Spring, MD (US);
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.