Tunable notch filter for reducing vibration sensitivity for vort

Details Tunable notch filter for reducing vibration sensitivity for vort Tunable notch filter for reducing vibration sensitivity for vort

1981-12-10

1984-02-21

Stephan, Steven L.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 132

Patent

active

044322429

ABSTRACT:
A notch filter arrangement for reducing vibration noise in a vortex shedding flowmeter circuit is disclosed which utilizes a plurality of sequentially closable switches. The plurality of switches are all closed during a single period of the vibration signal fundamental frequency. Each switch is connected in series to a capacitor which is connected to the output signal of a vortex sensor so that the instantaneous average voltage of the vibration signal during any increment of time is subtracted from the vortex shedding frequency signal to produce a noise reduced signal.

REFERENCES:
patent: 3709034 (1973-01-01), Herzl
patent: 3982434 (1976-09-01), McMurtrie
patent: 4019384 (1977-04-01), Herzl
patent: 4270391 (1981-06-01), Herzl

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