Sensor for a vortex shedding flowmeter

Details Sensor for a vortex shedding flowmeter Sensor for a vortex shedding flowmeter

1984-10-22

1985-11-12

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

73655, 250227, 250231R, 350 9615, G01F 132

Patent

active

045520267

ABSTRACT:
A fiber optic device senses the generation of vortices by measuring the torsional displacement of a bluff body mounted for rotation about its center of inertia within a fluid conduit. An internally toothed member is fixed to the outside of the fluid conduit, and an externally toothed member is fixed to the bluff body for rotation therewith and is in partial meshing relation to the externally toothed member. An optical fiber is entrained between the toothed members and has one end exposed to a light source and the opposite end connected to a detector which is operable to detect changes in the intensity of the light transmitted through the fiber. As the bluff body vibrates, the toothed members are displaced relative to one another causing changes in the radius of curvature of the segments of the optical fiber received between the teeth, thus changing the intensity of light transmitted through the fiber in proportion to the changes in the radius of curvature.

REFERENCES:
patent: 4358678 (1982-11-01), Lawrence
patent: 4472628 (1984-09-01), Whitten

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