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:
Jul. 12, 1988
Filed:
Feb. 12, 1987
Andrew K Levien, Menlo Park, CA (US);
Exac Corporation, Campbell, CA (US);
Abstract
A dual-tube Coriolis flow meter is disclosed in which each tube is formed into a loop and the loops are connected either in series or in parallel flow relationship to allow each loop to accept at least a portion of the flow in a flow line. The loops are elongated in the direction of the flow line. A drive means is disposed between the tubes at a point between the loop extremities and opposite the cross-over points of the loops. Small permanent magnets are attached to each loop to interact with the drive means to impart oppositely directed drive forces to the two loops. Sensors are positioned at the extremities of the loops and include electromagnetic sensing windings carried by the base and disposed between the loops. Pairs of small permanent magnets are carried by each loop end and create magnetic fields which are cut by arcuate portions of the windings to induce signals in the windings that are proportional to the relative motions of the loop ends. The sensitivity of the device may be improved by coupling a resilient linking member between the loop at their drive points. The linking member has the effect of increasing the spring constants of the loops in the drive mode without affecting the spring constants in the Coriolis mode.