Tunable notch filter for reducing vibration sensitivity for...

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

G - Physics

01

F

73/125, 354/31

G01F 1/32 (2006.01)

Patent

CA 1182307

-9- ABSTRACT OF THE DISCLOSURE A notch filter arrangement for reducing vibra- tion noise in a vortex shedding flowmeter circuit is dis- closed 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.

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