Patent ID: 7899647

Claim:
A method for identifying an operating state during an operation of a turbine having an exhaust gas flowing through an exhaust gas housing downstream of the turbine, comprising: detecting temperature values of the exhaust gas in the exhaust gas housing in a time-resolved fashion and in a plane transverse to principal flow direction of the exhaust gas; measuring the temperature values of the exhaust gas in a spatially resolved fashion with reference to an origin of an imaginary Cartesian coordinate system; projecting the measured temperature values into two axes of the imaginary Cartesian coordinate system; decomposing the measured temperature values into two spatial components perpendicular to one another; directing the two spatial components either positively or negatively at the imaginary Cartesian coordinate system; calculating a moment from a lever arm that is pivoted at two reference values of the two axes of the imaginary Cartesian coordinate system; summing up moments for the two axes to form two oppositely directed moment sums; evaluating the two reference values from the two moment sums; composing a point from the two reference values as a centroid of the temperature distribution; and identifying the operating state of the turbine based on the centroid of the temperature distribution.