Vortex flowmeter
AssigneeYokogawa Electric Corporation
InventorsMasami Wada, Masanori Hondo, Tetsuo Andoh
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Abstract
The invention encompasses a vortex flowmeter for measuring the flow rate of a fluid by detecting an alternating signal produced by Karman vortices using a sensor comprising a low pass filter for passing the frequency band of the alternating signal that is determined by the diameter and flow rate range of the vortex flowmeter; subband filters for splitting the frequency band passing through the low pass filter into a plurality of component bands; a spectrum analyzer for analyzing the plurality of component bands; and a bandpass filter for passing a frequency band to be measured according to the analysis results of the spectrum analyzer, thereby providing flow rate measurement with high precision.
Claims28
A vortex flowmeter for measuring the flow rate of a fluid by detecting an alternating signal produced by Karman vortices, wherein a vortex flow rate signal, obtained by said alternating signal passing through a filter and being converted by an A/D converter to a digital signal, is used for signal processing, said flowmeter comprising:
- low pass filter means for passing a frequency band determined by the diameter and flow rate range of said vortex flowmeter;
- sub-band filter means for splitting a frequency band passing through said low pass filter means into a plurality of split frequency sub-bands;
- spectrum analyzer means for analyzing said plurality of split frequency sub-bands;
- and
- band pass filter means for passing a frequency band to be measured according to analysis results from said spectrum analyzer means.
Dependencies are inferred from the claim text.