Christine C Kim

US Patent:

20060120197, Jun 8, 2006

Filed:

Oct 19, 2005

Appl. No.:

11/252633

Inventors:

Carole Teolis - Glen Dale MD, US
Anthony Teolis - Glen Dale MD, US
Christine Kim - Falls Church VA, US

International Classification:

G11C 5/14

US Classification:

365226000

Abstract:

A method and apparatus for determining the operating condition of a turbine engine. An eddy current sensor is provided having a sensing field in communication with a plurality of rotating turbine blades during a revolution of a turbine engine. A threshold point value is defined for the signature data. A plurality of positive threshold point pairs and negative threshold point pairs are identified. A plurality of positive threshold widths from a plurality of times elapsed between the positive threshold point pairs and a plurality of negative threshold widths from a plurality of times elapsed between the negative threshold point pairs are determined. A plurality of threshold ratios are determined from a plurality of pairs of positive and negative threshold widths. A variance of the threshold ratios is correlated with an operating condition of the turbine engine.