Numerical modelling of wave propagation in optical fibre using frequency domain spectral element method

Shweta Paunikar; Rohan Soman; Wieslaw Ostachowicz

doi:10.1117/12.2612489

19 April 2022 Numerical modelling of wave propagation in optical fibre using frequency domain spectral element method

Shweta Paunikar, Rohan Soman, Wieslaw Ostachowicz

Proceedings Volume 12048, Health Monitoring of Structural and Biological Systems XVI; 120480A (2022) https://doi.org/10.1117/12.2612489
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

Ultrasonic guided waves are commonly used in aerospace, civil, and mechanical industries for inspecting the health of a structure non-destructively. The excellent efficiency whilst sensing ultrasonic waves and the single lead-in and lead-out wire prove advantageous while using Fibre Bragg Grating (FBG) sensors as transducers. To overcome high signal-to-noise ratio demand of FBGs directly bonded to structures, researchers have recently proposed use of edge reflection approach as well as the remote bonding configuration. In order to maximise the efficiency of such FBGs, it is essential to understand the wave propagation behaviour in the FBG and the nature of strain transfer from the structure to the FBG. In this work, these aspects are studied using experiments and numerical model based on spectral finite element method (SFEM). The paper discusses the physics of the wave propagation from the structure to the fibre and the directional sensitivity of the FBG sensors in a computationally efficient way.

Conference Presentation

Citation Download Citation

Shweta Paunikar, Rohan Soman, and Wieslaw Ostachowicz "Numerical modelling of wave propagation in optical fibre using frequency domain spectral element method", Proc. SPIE 12048, Health Monitoring of Structural and Biological Systems XVI, 120480A (19 April 2022); https://doi.org/10.1117/12.2612489

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