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. 26, 1996
Filed:
Jul. 05, 1995
Toyoaki Yokoi, Tokyo, JP;
Hiroshi Owada, Tokyo, JP;
Yokogawa Electric Corporation, Tokyo, JP;
Abstract
A Coriolis type mass flowmeter utilizing a measuring tube through which flows the fluid being examined and a pair of Coriolis signals generated thereby, wherein are provided a first and second A/D converter to convert the respective pair of Coriolis signals into respective digital signals; a first and second phase shifter for converting the respective digital signals to output signals each deviated from the respective digital signals by 90.degree.; a timing clock generator for supplying the first and second A/D converter with timing signals which are independent of vibrations of the Coriolis signals, and trigonometric calculating device for obtaining tan .PHI. using the following equation: tan .PHI.=(bc-ad)/(ac+bd), wherein a and c represent the outputs from the A/D converters, and b and d represent the outputs from the phase shifters, and tan .PHI. represents the tangent signal of the phase difference between the pair of Coriolis signals, whereby the speed of calculation is considerably increased and error of calculation is substantially eliminated.