The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 12, 2002
Filed:
Aug. 24, 2000
Yokogawa Electric Corporation, Tokyo, JP;
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.