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:
Jun. 19, 1990
Filed:
Jan. 31, 1989
Ichizo Itoh, Tokyo, JP;
Toshiyuki Miyata, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A vortex flowmeter comprising a signal converting sensor for converting a flow rate to be measured into a vortex signal, a tracking filter section in a subsequent stage, and a noise discriminating circuit. The tracking filter section receives the output amplitude of the signal converting sensor, changes the corner frequency of a low pass filter, and delivers a filtered signal. The noise discriminating circuit receives a frequency signal obtained by frequency conversion of the filtered signal and the output amplitude of the signal converting sensor, performs a given calculation to achieve noise discrimination, and prevents output of the frequency signal when noise is found.
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