Optics: measuring and testing – Velocity or velocity/height measuring – With light detector
Patent
1974-11-08
1976-04-27
Wilbur, Maynard R.
Optics: measuring and testing
Velocity or velocity/height measuring
With light detector
250237G, 250573, 250574, G01P 336
Patent
active
039531260
ABSTRACT:
The velocity of a fluid flowing through a flow channel, relative to the flow channel, is measured by passing parallel rays of light through the fluid perpendicular to the flow and through an artificially-introduced transfer function device such as a grating or double reflective mirror, and then focusing the light on a photodetector. The basic principle by which embodiments of the invention operate involves the spatial convolution of the light intensity pattern established by the artificially-introduced transfer function with the flowing stream. The transfer function is associated with a known spatial alteration of the light beam. The light intensity pattern resulting from variations in the properties of the flowing stream is characterized by fluctuations which are transported with the flow velocity. These variations of the flowing stream are manifested as localized changes in density, and absorptivity and reflectivity of the light as it traverses the flow channel. This convolution generates a new response function that appears at the electrical output of the photodetector which is periodic and whose base frequency is directly proportional to the flow velocity.
REFERENCES:
patent: 3519351 (1970-07-01), Lerwill
patent: 3548655 (1970-12-01), Rudd
patent: 3675029 (1972-07-01), Iten et al.
patent: 3830568 (1974-08-01), Allen
patent: 3864044 (1975-02-01), Lyshkow
patent: 3888589 (1975-06-01), Swift
Dubro Gary Arnold
Kim Dong Guen
Buczinski S. C.
Duncan Robert Kern
Rusz Joseph E.
The United States of America as represented by the Secretary of
Wilbur Maynard R.
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