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Innovative Fiber Optic Elastometer for Strain Measurement and Structural Monitoring

This paper discusses a novel fiber optic elastometer designed to measure strain in fiber materials, which causes changes in the refractive indices at the core and cladding interface. It highlights the detection of subsequent Brillouin scattering and the modal power distribution (MPD). The system's efficacy is demonstrated in dynamic environments, such as parachute behavior. Additionally, it addresses the integration of lasers and detectors into an all-in-one system, and innovative fiber compositions to enhance elasticity for applications in structural monitoring and pipeline inspections.

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Innovative Fiber Optic Elastometer for Strain Measurement and Structural Monitoring

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  1. Fiber Optic Elastometer • Strain in fiber materal causes changes in indices of refraction at interface of core and cladding materials. • Subsequent Brillouin scattering and modal power distribution (MPD) easily detected. • vB (T0, ε) = Cε (ε –ε0) + vB0 (T0, ε0) El-Sherif, M., Fidanboylu, K., Gafsi, R., Yuan, J., Richards, K., El-Sherif, D., et al. (2000). A Novel Fiber Optic System for Measuring the Dynamic Structural Behavior of Parachutes. Journal of Intelligent Material Systems and Structures, 11(5), 351-359 Distributed fiber strain sensor based on Brillouin scattering for inspection of pipeline buckling LufanZou, XiaoyiBao, Fabien Ravet, Liang Chen, Joe Zhou, and Tom E. Zimmerman, Proc. SPIE 5855, 571 (2005), http://communication.howstuffworks.com/fiber-optic-communications/fiber-optic.htm 3.042 Project Laboratory Sense-On

  2. Challenges • Fibers that can sustain high strain (>10% ) • Has to be sewn in due to dynamic stress environment • All-In-One system (laser, fiber, and photodiode) 3.042 Project Laboratory Team Sensors

  3. Solutions • Vary composition of fibers to increase elasticity. • Incorporate laser and detector into sensor 3.042 Project Laboratory Sense-On

  4. Gantt Chart 3.042 Project Laboratory Sense-On

  5. Solutions • El-Sherif, M., Fidanboylu, K., Gafsi, R., Yuan, J., Richards, K., El-Sherif, D., et al. (2000). A Novel Fiber Optic System for Measuring the Dynamic Structural Behavior of Parachutes. Journal of Intelligent Material Systems and Structures, 11(5), 351-359. doi: 10.1106/JF6U-2FQ9-FQGE-3VXK. • Distributed fiber strain sensor based on Brillouin scattering for inspection of pipeline buckling LufanZou, XiaoyiBao, Fabien Ravet, Liang Chen, Joe Zhou, and Tom E. Zimmerman, Proc. SPIE 5855, 571 (2005), DOI:10.1117/12.624267 • http://communication.howstuffworks.com/fiber-optic-communications/fiber-optic.htm 3.042 Project Laboratory Team Sensors

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