Measurement of morphing wing deflection by a cross-coherence fiber optic interferometric technique

A fiber-optic interferometric technique aimed at measuring the deflection of aircrafts' morphing wings is presented. The wing deflection induces a strain in the sensing fiber optic coils that are firmly fixed onto the wing. A change of the phase angle of the light propagating through the fiber...

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Veröffentlicht in:Smart materials and structures 2018-01, Vol.27 (1), p.15017
Hauptverfasser: Tomi, Miloš C, Djinovi, Zoran V, Scheerer, Michael, Petricevic, Slobodan J
Format: Artikel
Sprache:eng
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Zusammenfassung:A fiber-optic interferometric technique aimed at measuring the deflection of aircrafts' morphing wings is presented. The wing deflection induces a strain in the sensing fiber optic coils that are firmly fixed onto the wing. A change of the phase angle of the light propagating through the fiber is measured by an 'all-in-fiber' Michelson interferometer based on a 3 × 3 fiber-optic coupler. Two light sources of different coherence lengths and wavelengths are simultaneously used to ensure a wide measurement range and high accuracy. A new technique for determination of the zero deflection point using the cross-correlation of the two interferograms is proposed. The experiments performed on a specimen made of a carbon-fiber-reinforced plastic honeycomb structure demonstrated a relative uncertainty
ISSN:0964-1726
1361-665X
DOI:10.1088/1361-665X/aa9afe