Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1989-04-19
1991-04-09
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
7386123, G01F 132
Patent
active
050054252
ABSTRACT:
A vortex flowmeter comprises a bank of filter sets (12) each for receiving a vortex signal produced according to the flow rate of a fluid to be measured, a waveform shaping circuit (13) for shaping an output of a selected one of the filter sets, a filter set switch decision circuit (14) for switching from one filter set to another by measuring the vortex frequency from an output of the waveform shaping circuit, and a switch circuit (15) responsive to a decision made by the filter set switch decision circuit to switch the filter set to thereby remove noise and beat components contained in the vortex signal.
REFERENCES:
patent: 3522449 (1970-08-01), McMurtrie
patent: 3638037 (1972-01-01), McMurtrie
patent: 3709034 (1973-01-01), Herzl
patent: 4270391 (1981-06-01), Herzl
patent: 4318303 (1982-03-01), Harrington
patent: 4432242 (1984-02-01), Thompson
patent: 4545258 (1985-10-01), Coursolle
Goldstein Herbert
Mitsubishi Denki & Kabushiki Kaisha
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