Electronics for fiber optic vortex shedding flowmeter

Details Electronics for fiber optic vortex shedding flowmeter Electronics for fiber optic vortex shedding flowmeter

G - Physics

01

D

73/59, 328/114.1

G01D 5/34 (2006.01) G01D 5/353 (2006.01) G01F 1/32 (2006.01)

Patent

CA 1227356

-13- ELECTRONICS FOR FIBER OPTIC VORTEX SHEDDING FLOW METER ABSTRACT OF THE DISCLOSURE An optical sensor arrangement comprises a light-emitting diode which is connected to a light detector over a light connection such as a fiber optics fiber. The fiber may be provided in the vicinity of a vortex shedding flow meter and is bent by the passage of vortices past the fiber. Bending the fiber causes attenuation of the light signal from the light-emitting diode to the light detector. The light-emitting diode is powered by a pulse generator which supplies the diode with low duty cycle high-current pulses. The resulting detected pulses are amplified, sampled and held to obtain peak values for each pulse. The detected pulse is suppressed by a feedback circuit portion which is activated only after each low duty cycle high current pulse. The detected peaks are utilized to generate a square wave which is used as a measurement of the variable, in particular the passage of vortices in a vortex shedding flow meter. - 13 -

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