Diffraction grating sensor for damage and modal analysis of fast rotating composite structures

Julian Lich; Tino Wollmann; Angelos Filippatos; Maik Gude; Jürgen Czarske; Robert Kuschmierz

doi:10.1117/12.2592581

20 June 2021 Diffraction grating sensor for damage and modal analysis of fast rotating composite structures

Julian Lich, Tino Wollmann, Angelos Filippatos, Maik Gude, Jürgen Czarske, Robert Kuschmierz

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Proceedings Volume 11782, Optical Measurement Systems for Industrial Inspection XII; 117820W (2021) https://doi.org/10.1117/12.2592581
Event: SPIE Optical Metrology, 2021, Online Only

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.

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Julian Lich, Tino Wollmann, Angelos Filippatos, Maik Gude, Jürgen Czarske, and Robert Kuschmierz "Diffraction grating sensor for damage and modal analysis of fast rotating composite structures", Proc. SPIE 11782, Optical Measurement Systems for Industrial Inspection XII, 117820W (20 June 2021); https://doi.org/10.1117/12.2592581

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KEYWORDS

Sensors

Diffraction gratings

Fiber reinforced polymers

Composites

Signal to noise ratio

Diffraction

Modal analysis

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