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:
Apr. 05, 1977
Filed:
Nov. 18, 1975
Lawrence B Marsh, Silver Spring, MD (US);
Marsh-McBirney, Inc., Rockville, MD (US);
Abstract
Electromagnetic sensing means are disclosed for measuring the velocity of a current of fluid, such as water, characterized by the use of a spherical body containing electromagnetic means including a first coil for establishing a first magnetic field in the fluid in which the spherical body is submerged, and a plurality of pairs of peripherally mounted circumferentially spaced pairs of diametrically arranged electrodes which are contained in a common first plane normal to the axis of the first magnetic field, each electrode of the electrode pair protruding radially outwardly from the outer surface of the spherical body a common distance which is between 0.100 and 0.125 inch per inch of the diameter of the spherical body. In a two-axis embodiment, first and second orthogonally-arranged pairs of diametrically opposed electrodes are provided, together with detecting and indicating means for comparing the electrical signals produced across the electrodes of the electrode pairs, respectively. In a three-axis embodiment, an orthogonally-arranged second coil is also provided for producing a second magnetic field the axis of which is contained in the common first plane and which bisects an opposite pair of angles defined by the diameters of the first and second pairs of electrodes, together with a third pair of diametrically opposed electrodes which are contained both in the first plane and in a second plane normal to the magnetic axis of the second coil. The signals produced across the three pairs of electrodes are compared to afford an indication of the fluid current velocity.