Fiber optic modal domain sensors for monitoring impact-related acoustic shock waves

Kim D. Bennett; R. C. Winters; Ru Z. Chen

doi:10.1117/12.172586

1 March 1994 Fiber optic modal domain sensors for monitoring impact-related acoustic shock waves

Kim D. Bennett, R. C. Winters, Ru Z. Chen

Proceedings Volume 2004, Interferometry VI: Applications; (1994) https://doi.org/10.1117/12.172586
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

Abstract

The applicability of optical fiber modal domain sensors to impact monitoring in aircraft components is studied. This work pulls together a number of scattered ideas from previous research programs onto one working platform, and includes the incorporation of lead-in and lead-out fibers, integrated spatial filtering, a novel fiber termination technique, and an inertial microbender to enhance mode coupling effects. Impacts to both graphite/epoxy composite and metallic specimens were carried out using a unique test apparatus constructed to accommodate a wide variety of measurement conditions. Test results suggest that modal domain sensors can offer quantitative information about the energy associated with a particular impact, as well as its location. Various sensor configurations and signal processing options are discussed, and recommendations for optimized sensing given.

Citation Download Citation

Kim D. Bennett, R. C. Winters, and Ru Z. Chen "Fiber optic modal domain sensors for monitoring impact-related acoustic shock waves", Proc. SPIE 2004, Interferometry VI: Applications, (1 March 1994); https://doi.org/10.1117/12.172586

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