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:
Sep. 15, 2009
Filed:
May. 30, 2007
Neil J. Goldfine, Newton, MA (US);
Darrell E. Schlicker, Watertown, MA (US);
Karen E. Walrath, Arlington, MA (US);
Andrew P. Washabaugh, Chula Vista, CA (US);
Neil J. Goldfine, Newton, MA (US);
Darrell E. Schlicker, Watertown, MA (US);
Karen E. Walrath, Arlington, MA (US);
Andrew P. Washabaugh, Chula Vista, CA (US);
JENTEK Sensors, Inc., Waltham, MA (US);
Abstract
One of the issues with planar eddy-current sensors is the placement of the current return for the primary winding. Often the ends of the primary winding are spatially distant from one another, which creates an extraneous and large inductive loop that can influence the measurements. A sensor geometry featuring a primary winding that reduces the effect of this inductive loop is presented. The primary winding may include a plurality of parallel extended winding segments. The segments further include adjacent individual drive coils. Current flows through individual drive coils in an alternating fashion. Current flows through adjacent drive coil portions in a common direction, thereby imposing a spatially periodic magnetic field with at least two periods.