Compound electronic filter for vortex flowmeters

Details Compound electronic filter for vortex flowmeters Compound electronic filter for vortex flowmeters

1993-08-30

1994-10-04

Goldstein, Herbert

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

053515560

ABSTRACT:
A compound electronic filter for conditioning an alternating electrical signal generated by vortex shedding in a vortex flowmeter has a first stage filter comprising a first plurality of electronic filters respectively including a first plurality of electronic switches and a second stage filter comprising a second plurality of electronic filters respectively including a second plurality of electronic switches, wherein the first plurality of electronic switches switching on and off the first plurality of electronic filters one at a time are controlled by a first command signal generated from the frequency of the output signal from the first stage filter, and the second plurality of electronic switches switching on and off the second plurality of electronic filters one at a time are controlled by a second command signal generated from the frequency of the output signal from the first stage filter.

REFERENCES:
patent: 4270391 (1981-06-01), Herzl
patent: 4934194 (1990-06-01), Itoh et al.
patent: 4966040 (1990-10-01), Ohmae

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