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NDT.net Issue - 2016-08 - Articles
NDT.net Issue: 2016-08
Publication: 8th European Workshop on Structural Health Monitoring (EWSHM 2016), July 5-8, 2016 in Bilbao, Spain (EWSHM 2016)
Session: Fiber Optic Sensors Systems
ARTICLE

Robust integration of optical fiber sensors for aerospace applications in composite material structures

Malte Frövel19, José María Pintado17, Gabriel Carrión1, Fernando Cabrerizo1, Félix Terroba12, Thorbjorn Buck2, Arnd Reutlinger3, Javier San Millán12
1aComposite Materials bAeronautical Programs; Spanish Institue for Aerospace Technology (INTA)9, Torrejón de Ardoz, Spain
2Technical University of Munich (TUM)114, Munich, Germany
3Kayser Threde, Munich, Germany

Abstract: Fiber optic sensors are robust sensors that stand very harsh aeronautic and space environment, when being embedded in composite material with polymeric matrix (CFRP) and when the ingress/egress (i/e) point of the optical fiber is well protected. The embedded fibers normally only break, when the CFRP structures breaks or when an impact on the host material happens very close to the fiber location. The situation is much more complicated in the i/e point of the fiber from the host structure. The stiffness jump in the i/e makes the optical fiber very vulnerable. An adequate protection must be insured using for this frequently embedded polymeric tubes and acrylic rubbers. The following paper gives examples of different embedded fiber optic Bragg grating sensors (FBGS) in composite samples and structures for aerospace applications. Fatigue and vibrations tests with different load spectrums for aeronautic and space applications have been performed to demonstrate the robustness of the embedded sensors and the i/e point. The performance of the embedded fibers in series with surface mounted connectors have been validated during vibrations tests simulating the launch condition of Ariane 5 launcher within the scope of an ESA-funded project and during fatigue cycles of ultimate load of aeronautic CFRP materials within a EDA funded project. In all the tested conditions, the optical sensors were operative during and after the performed tests.

Keywords: embedded sensor (79), composite (573), Fatigue (94), vibration (38), Fiber Optic Sensors (9), composite material (31), optical fiber sensor (64), embedded (2),
*Keywords are freely formed keywords from the authors and thus you may Search also for similar terms.

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