For performance improvement and failure prediction, numerical models are necessary to describe the modal behavior of GFRP rotors as a function of their damage state and rotational speed. Model validation requires in-process measurements. We show that the diffraction grating method enables simultaneous strain and tilt measurements with precisions <20 με and <4’’ and a spatial resolution <5 mm at surface speeds >250 m/s. An in-situ determination of the damage state by strain field analysis and vibration measurements are performed on a moving rotor and compared with the results of piezoelectric strain gauges, a vibrometer and a distance sensor.