Electronics for fiber optic vortex shedding flow meter

Details Electronics for fiber optic vortex shedding flow meter Electronics for fiber optic vortex shedding flow meter

1984-05-21

1986-12-09

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250214R, H01J 516, H01J 4014

Patent

active

046281975

ABSTRACT:
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.

REFERENCES:
patent: 4011754 (1977-03-01), Pitt
patent: 4552026 (1985-11-01), Knudsen et al.

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