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Osten, Wolfgang
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document
Diffraction grating sensor for damage and modal analysis of fast rotating composite structures
Abstract
To measure the dynamic behavior of rotating fiber reinforced polymer structures, an optical diffraction grating based sensor has been developed to measure in-plane strain and out-of-plane tilts on the rotor surface with high spatio-temporal resolution. A novel modal analysis approach based on the combination of consecutive measurements with a known excitation and varying time delays was used to extract fully featured modal parameters from a rotating composite disk. The results of the diffraction grating based approach were compared to the results of a commercial triangulation sensor and a piezoresistive strain gauge and showed excellent SNR at surface speeds up to 280 m/s.