G - Physics
01
F
73/125
G01F 1/32 (2006.01) G01P 5/01 (2006.01)
Patent
CA 1173274
R.J. Williamson - D.N. Batchelder 14-6 (Rev.) VORTEX FLOWMETER ABSTRACT OF THE DISCLOSURE A bluff body is placed in a fluid pipe with one flat face facing the oncoming fluid. Vortices are then generated and shed alternately from opposite edges of the body. This body is of a scalene triangle cross section, and in one version a hole extends transversely therethrough. A longitudinal hole intersects the first hole at right angles thereto. The vortices cause oscillations in the transverse hole. A light beam is provided in the longitudinal hole. The light beam is modulated as it crosses the path of the transverse hole. Hence by measuring the frequency at which the beam is modulated and by suitable calibration, one gets a good and reliable indication of fluid flow rate. In a second version the transverse hole is formed into a blind hole at the foot of which is an etalon (a Fabry-Perot interferometer). The effect of the fluid oscillations due to vortex generation influences the etalon so that its output is a measure of the fluid flow rate.
391009
Batchelder David N.
Williamson Roger J.
Itt Industries Inc.
Smart & Biggar
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