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:
Mar. 28, 2006
Filed:
Mar. 12, 2003
Ronald T. Harrold, Murrysville, PA (US);
Zal N. Sanjana, Pittsburgh, PA (US);
Richard D. Holm, Pittsburgh, PA (US);
Ronald T. Harrold, Murrysville, PA (US);
Zal N. Sanjana, Pittsburgh, PA (US);
Richard D. Holm, Pittsburgh, PA (US);
Siemens Westinghouse Power Corporation, Orlando, FL (US);
Abstract
A pressure sensor () for a harsh environment such as the combustion chamber () of a gas turbine engine (). The pressure sensor includes an acoustic waveguide () having a sensing portion () exposed to the combustion gas in the combustion chamber. Modulations in an acoustic signal passing through the acoustic waveguide are sensed and correlated to pressure fluctuations in the combustion gas. The sensing portion of the waveguide includes a core acoustic waveguide element () covered by a coating material (). The coating material not only protects the core from the harsh environment, but it also improves the efficiency of the transfer of energy from the combustion gas into the waveguide because it provides a stepped transition from the acoustic impedance of the gas to the acoustic impedance of the core material. The protective coating may have a plurality of layers () and/or it may include a graded material () having an acoustic impedance value that varies across its depth.