Patent ID: 9599527
Date: 2017-03-21
CPC Classifications: G01L,G01M

Claim:
1. A method for monitoring flame status in a plurality of combustors of a gas turbine engine, comprising: receiving dynamic pressure sensor output signals from dynamic pressure sensors arranged in the combustors, the dynamic pressure sensor output signals being indicative of acoustic oscillations within the combustors; for each of the dynamic pressure sensor output signals, computing a preprocessed time-domain signal by digitizing and filtering the dynamic pressure sensor output signal; for each of the dynamic pressure sensor output signals, computing a preprocessed wavelet signal using a discrete wavelet transform; applying a wavelet-based flame detection algorithm to the preprocessed wavelet signals to determine a wavelet-based flame status for each of the dynamic pressure sensor output signals; for each combustor, performing a correlation analysis on one or more of the preprocessed time-domain signals to determine a correlation-based flame status; determining the flame status based on the correlation-based flame status and the wavelet-based flame statuses.