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. 04, 1997
Filed:
Mar. 06, 1995
Rodney M Eslinger, Marietta, GA (US);
Christopher P Smith, Acworth, GA (US);
David E Morlan, Marietta, GA (US);
Klane B Anderson, Marietta, GA (US);
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Abstract
An optical system for determining the axial load, the torsional load or both on a generally cylindrical member, such as a valve stem in a motor operated valve, includes a first system for producing a test light that is modified by a physical change in the valve stem caused by the load, a second system for receiving the test light and converting the same to a first signal indicative of the physical change, and a third system for converting the first signal to a second signal indicative of the load, preferably by utilizing one or more of the relations defined in Equations 1-3. The physical change in the cylindrical member can be, for example, a diametrical change or a longitudinal change, which can be measured by the first and second systems. The dimensional changes can be related to the axial load according to Hooke's Law or Poisson's relation by the third system when material properties and the geometry of the cylindrical member are known. Similarly, the torsional load applied to the cylindrical member can be obtained by measuring the twist angle between two longitudinally separated planes of the member, and applying a known relation between the twist angle and known geometric and material characteristics of the cylindrical member.