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:
Aug. 23, 2011
Filed:
Oct. 02, 2007
Anthony G. Razzell, Derby, GB;
Lee Mansfield, Derby, GB;
Leo V. Lewis, Kenilworth, GB;
Rolls-Royce PLC, London, GB;
Abstract
Sensors () for determining a gap between a conductive member () such as a blade in a gas turbine engine and a seal segment () are known to use capacitive variants in order to create an electrical signal indicative of the gap width. Thermal disparities can create problems with regard to sensor aging and accuracy. By creating a sensor incorporating a metal rod () typically integrally formed or associated with the seal segment () and coupled through inductive coupling loops () it is possible to create a tuned circuit with a Q value which is more stable and therefore acceptable with regard to producing more accurate results at elevated temperatures with less problems with regard to thermal disparities.