Method and device for determination of the condition of a turbine blade, and utilizing the collected information for estimation of the lifetime of the blade

Method for determining the state of a turbine blade, and use the information collected to estimate the lifetime of the blade in determining when it is producing a rotating stall in the blades (2, 4) turbine compressor (1), by using a detector (10) sensitive to vibration that is fixed to the housing (6) of the compressor (1), and where the measured values ​​of the detector (10) sensitive to vibration filtered and allocated to their respective frequencies , that is given to the measured values ​​within respective groups of frequency limit value maximum frequency and / or minimum frequency, characterized in that rotating stall is indicated and included in an estimate of useful life of the blade (2, 4) when the turbine blade pass frequency of step (2) in question compressor begins to fluctuate and the fluctuation falls outside said limits.