Impact detection in aeronautical structures allows predicting their future reliability and performance. An impact can produce microscopic fissures that could evolve into fractures or even the total collapse of the structure, so it is important to know the location and severity of each impact. For this purpose, optical fibers with Bragg gratings are used to analyze each impact and the vibrations generated by them. In this paper it is proven that optical fibers with Bragg gratings can be used to detect impacts, and also that a high-frequency interrogator is necessary to collect valuable information about the impacts. The use of two interrogators constitutes the main novelty of this paper.
References
[1]
Zubia, J.; Arrue, J. Plastic optical fibers: An introduction to their technological processes and applications. Opt. Fiber Technol. 2001, 7, 101–140.
[2]
Wolfbeis, O.S. Fiber-optic chemical sensors and biosensors. Anal. Chem. 2008, 80, 4269–4283.
[3]
Gomez, J.; Zubia, J.; Aranguren, G.; Arrue, J.; Poisel, H.; Saez, I. Comparing polymer optical fiber, fiber Bragg grating, and traditional strain gauge for aircraft structural health monitoring. Appl. Opt. 2009, 48, 1436–1443.
[4]
Méndez, A. Fiber Bragg grating sensors: A market overview. Proc. SPIE 2007, 6619, 661905.
[5]
Menendez, J.M. Market opportunities on fiber optic sensors for aeronautics and aerospace applications. Proc. SPIE 2007, 6619, 661908.
[6]
Sang, A.; Marsden, K.; Wolfe, M.; Gifford, D.; Froggatt, M.; Soller, B. High Resolution Dynamic Strain Measurements with Continuous Fiber Bragg Gratings for Structural Health Monitoring. Proceedings of the Avionics, Fiber-Optics and Phototonics Technology Conference, (AVFOP '09), San Antonio, TX, USA, 22–24 September 2009; pp. 29–31.
[7]
Liu, H.B.; Liu, H.Y.; Peng, G.D.; Chu, P.L. Strain and temperature sensor using a combination of polymer and silica fibre Bragg gratings. Opt. Commun. 2003, 219, 139–142.
[8]
Wu, H.F.; Hiche, C.; Liu, K.C.; Seaver, M.; Wei, J.; Chattopadhyay, A.; Diaz, A.A.; Shull, P.J.; Vogel, D.W. Characterization of impact damage in woven fiber composites using fiber Bragg grating sensing and NDE. Proc. SPIE 2009, 7294, doi:10.1117/12.815811.
[9]
Shin, C.S.; Chen, B.L.; Liaw, S.K. An FBG-based impact event detection system for structural health monitoring. Adv. Civ. Eng. 2010, 2010, 1–8.
[10]
Vella, T.; Chadderdon, S.; Selfridge, R.; Schultz, S.; Webb, S.; Park, C.; Peters, K.; Zikry, M. Full-spectrum interrogation of fiber Bragg gratings at 100 kHz for detection of impact loading. Meas. Sci. Technol. 2010, 21, doi:10.1088/0957-0233/21/9/094009.
[11]
Cauich-Cupul, J.I.; Pérez-Pacheco, E.; Valadez-González, A.; Herrera-Franco, P.J. Effect of moisture absorption on the micromechanical behavior of carbon fiber/epoxy matrix composites. J. Mater. Sci. 2011, 46, 6664–6672.
[12]
Abramovitch, H.; Burgard, M.; Edery-Azulay, L.; Evans, K.E.; Hoffmeister, M.; Miller, W.; Scarpa, F.; Smith, C.W.; Tee, K.F. Smart tetrachiral and hexachiral honeycomb: Sensing and impact detection. Compos. Sci. Technol. 2010, 70, 1072–1079.